mysql select large number of rows

MySQL $con=mysqli_connect ("localhost","my_user","my_password","my_db"); // Check connection. We have applications with many billions of rows and Terabytes of data in MySQL. The @row_number is a session variable indicated by the @ prefix. The mysqli_num_rows () function returns the number of rows in a result set. Select specific rows in a range with MySQL? The following SQL statement is one of the most common ones. I stripped one of four bolts on the faceplate of my stem. Limiting the SQL result set is very important when the underlying query could end up fetching a very large number of records, which can have a significant impact on application performance. mysql> create table DemoTable -> ( -> PageNumber text -> ); Query OK, 0 rows affected (2.50 sec) Insert some records in the table using insert command −. This can also work in SQL Server. To start getting our row counts, we’ll need a list of our SQL tables. where the country is "Germany" (for SQL Server/MS Access): If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. "LIMIT N" is the keyword and Nis a… I need a MySql statement that will select all the rows, as well as how many total rows there are. I have two problems. Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. What's a great christmas present for someone with a PhD in Mathematics? The FETCH is used in combination to OFFSET to provide a limit of rows from the table. Are cadavers normally embalmed with "butt plugs" before burial? To get the number of rows per table, you use the COUNT(*) operator in SELECT as follows: SELECT COUNT(*) FROM table_name; To limit the number of rows/records a SELECT query can fetch append your SQL Query with LIMIT modifier and the syntax of the SQL Query is given below: mysql> your_sql_query LIMIT number_of_records; If the number of records in the database for the query is less than the specified, then all those records would be fetched. The LIMIT clause is used to constrain the number of rows returned by the SELECT statement. Run a command on files with filenames matching a pattern, excluding a particular list of files. It can be used in conjunction with the SELECT, UPDATE OR DELETE commands LIMIT keyword syntax The syntax for the LIMIT keyword is as follows HERE 1. records. Method 3 – Fetch That's a lot of processing to do, especially if the final result is just a couple of rows (meaning that there are nearly 900,000 rows that get searched uselessly). I have a table with 23 million rows and the following query takes 30+ seconds on production hardware: select count (*) from tablename; It seems that MySQL must be doing a table scan, but … The limit keyword is used to limit the number of rows returned in a query result. In this tutorial you will learn how to fetch limited number of records from a MySQL database table using PHP. And is it an InnoDB or MyISAM table? Always use ORDER BY so you are in control of which (50) rows will be chosen for return (unless you really don't mind semi-random results or there are serious performance issues). Below is a selection from the "Customers" table in the Northwind sample database: The following SQL statement selects the first three records from the "Customers" table We can get this easily with: From here, we need a way to turn the names of tables like ‘users’ into an executable SQL statement. needs a simple index on (status, created_at): After testing that the query is using the new index and is more efficient, you can probably drop the old status index. This reduces server load. Returning a large number of records can impact performance. This table has a row length of 20 (which was a bit of surprise to me) and it has: t1v1 – 1.83 sec (6.5M rows/sec; 125M/sec) So there is surely the penalty for dynamic rows, however, it is not very significant if the number of columns is small. Without printing all the row data, we can get just the number of rows in the table using COUNT keyword. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. ; Use Python variables in a where clause of a SELECT query to pass dynamic values. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. What is the way to most efficiently count the total number of rows in a large table? 1. Execute the Select query and process the result set returned by the SELECT query in Python. See a rewrite: Thanks for contributing an answer to Database Administrators Stack Exchange! The Basic SELECT Statement 2. echo "Failed to connect to MySQL: " . Open in new window Basically what this says is that MySQL had to go one-by-one through 898,256 rows and check each one to see if field1 > 123 and if field2 = 'gr8gonzo'. GETTING THE NUMBER OF MYSQL ROWS IN ONE TABLE. Query result set - 0 rows returned: Other tutorials in this category. mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789'; Create tables from different … Instead of deleting 100,000 rows in one large transaction, you can delete 100 or 1,000 or some arbitrary number of rows at a time, in several smaller transactions, in a loop. SELECT * FROM ( SELECT t.*, ROW_NUMBER() OVER (ORDER BY name) rnum FROM yourtable t ) WHERE rnum BETWEEN 51 AND 60; This query uses the analytic function ROW_NUMBER, which returns a row number for each row ordered by the field specified (in this case, the name field). PHP MySQL LIMIT Clause. MySQL MySQLi Database To count how many rows have the same value using the function COUNT (*) and GROUP BY. To get number of rows in the 'orders' table with the following condition - 1. result have to display with a heading 'Number of Rows', the following SQL statement can be used: SQL Code: SELECT COUNT( *) as "Number of Rows" FROM orders; Output: Number of Rows ----- … "SELECT {fieldname(s) | *} FROM tableName(s)"is the SELECT statement containing the fields that we would like to return in our query. Also note that adding or changing the ORDER BY expression may affect performance. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. The COUNT(*) function returns the number of rows in a result set returned by a SELECT statement. What is an idiom for "a supervening act that renders a course of action unnecessary"? Good, I edited the answer but the index should be used with that order by. I have the following database table in MySQL : Now the EXPLAIN is giving following results. you can experiment with EXPLAIN to see how many rows are scanned for each type of search. MySQL can store XML in Text field. Sometimes when you expect a query to return a large number of rows but you are not sure if the SQL syntax is correct, you can use LIMIT 0 to validate the query. 1) I have to update a row if the id already exists, else insert the data. I have two problems. In this article, we are going to see how we can limit the SQL query result set to the Top-N rows only. MySQL MySQLi Database. mysqli_connect_error (); } $sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname"; The first number is where to start, and the second is the number of rows … The SELECT TOP clause is used to specify the number of records to return. Other than a new position, what benefits were there to being promoted in Starfleet? How can I optimize this for a better performance ? column BETWEEN value1 AND value2. Using MySQL shell. Was there an anomaly during SN8's ascent which later led to the crash? The steps we want to follow: “ Wash, rinse, repeat until zero rows affected”. Chris: 10 May • Re: SELECT Row Numbers? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Notice that the MySQL does not support CTE based delete, therefore, we had to join the original table with the CTE as a workaround. Using Column Alias in SELECT Statement 3. 1. Some storage engines, such as MyISAM, store the exact count. First, define a variable named @row_number and set its value to 0. mysql> create table Clients - > ( - > Client_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > ClientName varchar(20) - > ); Query OK, 0 rows affected (0.51 sec) Insert some records in the table using insert command. COUNT(expression) The COUNT(expression) returns the number of rows that do not contain NULL values as the result of the expression. For a large number of columns, dynamic rows become very expensive and you have to watch out. (for SQL Server/MS Access): The following SQL statement shows the equivalent example using the LIMIT clause Queries are more clear with aliases. Chris: 10 May • Re: SELECT Row Numbers? There are two rows in the table. This article is about typical mistakes people are doing to get their MySQL running slow with large tables. You can select the database using USE database;. The SELECT TOP clause is used to specify the number of records to return. supports the LIMIT clause to select a limited number of records, while Oracle uses ROWNUM. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Oracle): The following SQL statement selects the first 50% of the records from the Select the Database. (for MySQL): The following SQL statement shows the equivalent example using ROWNUM (for Just omit the WHERE clause from the SELECT statement. Here I think the indexes being utilized. Asking for help, clarification, or responding to other answers. mysql> insert into DemoTable(StudentName) values('John'); Query OK, … At 09:06 AM 10/19/2006, you wrote: >I have a simple single-table SELECT query that takes of several >minutes to complete, due to a very large number of result rows being >involed. up to date? MySQL MySQLi Database. Can I combine two 12-2 cables to serve a NEMA 10-30 socket for dryer? The tradeoff is between how soon all the chunks are finished versus how much impact each chunk has on … Firstly, you need to find the selection criteria by which you can select the specific row. The COUNT(*) function returns the number of rows in a result set returned by a SELECT statement. "Customers" table (for SQL Server/MS Access): The following SQL statement selects the first three records from the "Customers" table, Did COVID-19 take the lives of 3,100 Americans in a single day, making it the third deadliest day in American history? Starting with version 8.0.2, MySQL now offers a way to easily number rows. When could 256 bit encryption be brute forced? The syntax is as follows − SELECT yourColumName1, count (*) as anyVariableName from yourTableName GROUP BY yourColumName1; MySQL stored all the information related to tables in a database in the information_schema database. To learn more, see our tips on writing great answers. Here is the query to update multiple rows in a single column in MySQL − mysql> UPDATE updateMultipleRowsDemo -> SET StudentMathScore= CASE StudentId -> WHEN 10001 THEN 45 -> WHEN 10002 THEN 52 -> … There are no table joins involved so this should be quite fast. PHP MySQL LIMIT Clause. It may make more sense to directly fetch and delete via the MySQL shell. Selects only the rows where the ZIP code is greater than 19999. but less 30001. column IN (value1,value2,…) zip IN (“90001”,”30044”) Selects only the rows where the ZIP code is 90001 or 30044. I used ORDER BY created_at. It is also one of the … This feature is very helpful for optimizing the page loading time as well as to enhance the readability of a website. The SQL SELECT TOP Clause. (2 replies) I'm doing some benchmarks with MySQL and have very slow times when retrieving a large # of rows. You can refer to a table within the default database as tbl_name, or as db_name.tbl_name to specify … MySQL for Database Administrators How to Persist Global Variables Without Using Option Files in MySQL 8.0. In such cases, use SELECT COUNT(*) to obtain an accurate count. Book with a female lead on a ship made of microorganisms, My new job came with a pay raise that is being rescinded. This article demonstrates how to issue a SQL SELECT Query from Python application to retrieve MySQL table rows and columns. Goals of this lesson: You’ll learn the following MySQL SELECT operations from Python. The query is taking almost 35 seconds to execute and when I use this with PHP, it is getting timed out. mysql> select count (pad) from large; +------------+ | count (pad) | +------------+ | 31457280 | +------------+ 1 row in set (4 min 58.63 sec) mysql> select count (pad) from large where val between 1 and 100; +------------+ | count (pad) | +------------+ | 314008 | +------------+ 1 row in set (29 min 53.01 sec) 1. 3.3.4.2 Selecting Particular Rows As shown in the preceding section, it is easy to retrieve an entire table. Once the index is added, it resorts to using the index to do GROUP BY. MySQL is a Relational Database Management System, widely used as a database system for Linux systems. Do native English speakers notice when non-native speakers skip the word "the" in sentences? Making statements based on opinion; back them up with references or personal experience. use numeric ids instead of strings for country/language I am using php to insert the data into mysql server. It’s only available from stored procedures, so we’ll write a custom function that invokes eval. Verify if the selection criteria selects only the specific row. split the query in 2 queries: make the search query, then a second SELECt to get the relevant news rows. Is Bruce Schneier Applied Cryptography, Second ed. It may make more sense to directly fetch and delete via the MySQL shell. This article is not about MySQL being slow at large tables. Is the stem usable until the replacement arrives? In this post: MySQL Count words in a column per row MySQL Count total number of words in a column Explanation SQL standard version and phrases Performance Resources If you want to count phrases or words in MySQL (or SQL) you can use a simple technique like: SELECT description, LENGTH mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar (20) ); Query OK, 0 rows affected (1.23 sec) Insert some records in the table using insert command −. Sometimes when you expect a query to return a large number of rows but you are not sure if the SQL syntax is correct, you can use LIMIT 0 to validate the query. While we can trivially concatenate on ‘select count(1) from ‘ to each table name, we need a way to actually run this constructed query. How do you label an equation with something on the left and on the right? COUNT(DISTINCT expression) The COUNT(DISTINCT … Why it is important to write a function as sum of even and odd functions? Run the SQL Query DELETE FROM table_name WHERE selection_criteria LIMIT 1;. Selects only the rows where the ZIP code is 50000 or lower. I have a table with 1 million rows in it. Using SQL_CALC_FOUND_ROWS for pagination is the worst idea, because there is no LIMIT optimization: ALL rows must be read for counting and just 15 rows get returned. I have an excel sheet which has a large amount of data. I don't think there is any way to optimise the query - MySQL >is already using the appropriate index etc, it's just a huge table and >the query has a large result set. In addition to reducing the impact on the log, you could provide relief to long-running blocking. This article will help you to calculate the size of tables and database in MySQL or MariaDB servers though SQL queries. 1) I have to update a row if the id already exists, else insert the data. 4) Pagination using ROW_NUMBER() function. The query gets more complex, you may have trouble isolating/excluding the FOUND_ROWS() result, and mysql_num_rows() will return the number of actual results + 1, all of which makes your code messier and harder to read. mysql, select, subquery / By keewee279 I have a column itemId that contains unique IDs in the format US001, US002, US003 etc. The user will be able to select any subset of it using a simple Select statement and a Where clause. When taken literally, this is not possible. The Basic SELECT Statement 2. The following SQL statement is one of the most common ones. Girlfriend's cat hisses and swipes at me - can I get it to like me despite that? While using W3Schools, you agree to have read and accepted our. Important MySQL Commands, mysql> SELECT * FROM [table name] WHERE name != "Something" AND phone_number = '0123456789' order by phone_number; Show all records starting with the letters 'Something' AND the phone number '0123456789'. For example, if we want to list the number the films in the Sakila Sample Database, grouped by rating and ordered by release year: SELECT *, The SELECT TOP clause is useful on large tables with thousands of For other storage engines, such as InnoDB, this value is an approximation, and may vary from the actual value by as much as 40% to 50%. 2) BIG PROBLEM : I have more than 40,000 rows and the time out on the sql server which is … I have an excel sheet which has a large amount of data. MySQL Select Command, mysql> SELECT * FROM [table name]; mysql> SELECT * FROM persons; Returns the columns and column information pertaining to the designated table. Recommended Articles To select top 10 records, use LIMIT in MySQL. Then, select data from the table employees and increase the value of the @row_number variable by one for each row. The suggestion of "1000" rows per chunks may need to be adjusted. In this tutorial you will learn how to fetch limited number of records from a MySQL database table using PHP. Examples might be simplified to improve reading and learning. ("probably" because you may have some rare query that profits a lot from a (status) index but is slow when using the (status, created_at) one.). Return the number of rows in a result set: your_sql_query LIMIT number_of_records; If the number of records in the database for the query is less than the specified, then all those records would be fetched. This is InnoDB. COUNT(expression) The COUNT(expression) returns the number of rows that do not contain NULL values as the result of the expression. Having LIMIT without ORDER BY is a recipe for indeterminate results. Suppose, you need to display a list of products with 10 products per page. It is also one of the … FETCH returns the result set after the SQL execution to get the rows along with skipping OFFSET rows count. Limiting Result Sets. Let us first create a table −. But MySQL would use this plan to group in the absence of an index to get sorted rows and using temporary table becomes costly because of large number of groups. MySQL Limit. mysql> show columns from [table name]; mysql> SHOW COLUMNS FROM persons; Show certain selected rows with the value “whatever”. We shall count the total number of rows in students table of school database. mysql> SELECT 1 + 1 FROM DUAL;-> 2 DUAL is purely for the convenience of people who require that all SELECT statements should have FROM and possibly … The result of a SQL query is a (virtual) table; the column in each row in that result table provides a value that is associated with that row only, and the rows are in effect independent of each other. The trailing numbers of these IDs are not consecutive as rows may have been deleted. 3. Using MySQL shell. The bigger the rows, and the more rows that you delete in a single "chunk", the more replication will be impacted. But typically you don't want to see the entire table, particularly when it becomes large. SELECT can also be used to retrieve rows computed without reference to any table.. For example: mysql> SELECT 1 + 1;-> 2 You are permitted to specify DUAL as a dummy table name in situations where no tables are referenced: . 2. When returning 1,000 rows it is quite fast. Note: Not all database systems support the SELECT TOP clause. We use the LIMIT clause to constrain a number of returned rows to five. zip BETWEEN “20000” AND “30000”. 2. We’ll want our cust… mfatene: 10 May • Re: SELECT Row Numbers? It only takes a minute to sign up. To delete a specific row in MySQL Table. Returning a large number of records can impact performance. 2) BIG PROBLEM : I have more than 40,000 rows and the time out on … if (mysqli_connect_errno ()) {. Retrieving data. For a large number of columns, dynamic rows become very expensive and you have to watch out. 2. "[WHERE condition]"is optional but when supplied, can be used to specify a filter on the result set. This table has a row length of 20 (which was a bit of surprise to me) and it has: t1v1 – 1.83 sec (6.5M rows/sec; 125M/sec) So there is surely the penalty for dynamic rows, however, it is not very significant if the number of columns is small. The COUNT(*) returns the number of rows including duplicate, non-NULL and NULL rows. currently, depending on the search query, mysql may be scanning the whole table to find matches. 2. Because the ROW_NUMBER() assigns each row in the result set a unique number, you can use it for pagination.. If you … MySQL FETCH with OFFSET helps MySQL to manage a large number of databases and their records to quickly fetch the rows to a limit range. Instead of strings for country/language the mysqli_num_rows ( ) function returns the number of.... That adding or changing the ORDER by id DESC LIMIT 100000, 15 ; Ouch, can! Fetch and delete via the MySQL shell a SELECT query in Python, is... Specified number of records, while Oracle uses ROWNUM statement allows you to read data one... Enhance the readability of a website retrieve an entire table, particularly when it becomes large are cadavers embalmed... ) the COUNT ( * ) returns the number of rows returned by SELECT! This tutorial you will learn how to issue a SQL SELECT query in.... Queries: make the search query, MySQL may be scanning the whole table to find matches avoid errors but... Query from Python application to retrieve an entire table, particularly when it becomes large most common.. Index is added, it is getting timed out update a row if the already. - can I optimize this for a better performance as rows may have deleted! Reading and learning and cookie policy is being rescinded recommended Articles 3.3.4.2 Selecting rows... Or personal experience rows and columns to 20.02 sec, it is also one the... It becomes large SQL tables “ 30000 ” learn how to fetch number..., MySQL may be scanning the whole table to find the selection criteria by which you can the. Obtain an accurate COUNT is a recipe for indeterminate results great christmas present for someone a! Very slow times when retrieving a large number of returned rows to.... // Check connection getting our row counts, we 've doubled the time 20.02. Records, while Oracle uses ROWNUM this with php, it is also one of the … delete! To this RSS feed, copy and paste this URL into Your RSS reader 0 rows:. What 's a great christmas present for someone with a PhD in Mathematics Persist! 10 may • Re: SELECT row Numbers to five `` localhost,! Improve reading and learning benchmarks with MySQL and have very slow times when retrieving a large amount data... A simple SELECT statement and a WHERE clause from the SELECT statement in... On opinion ; back them up with references or personal experience selection criteria by you. The rows WHERE the ZIP code is 50000 or lower to improve reading and learning all the row data we. And NULL rows of four bolts on the result set a unique number, you agree to our terms service. There to being promoted in Starfleet I combine two 12-2 cables to serve a NEMA 10-30 for. A new position, what benefits were there to being promoted in Starfleet: you ’ ll need list... A great christmas present for someone with a female lead on a ship made of microorganisms, my new came... Amount of data SQL query delete from table_name WHERE selection_criteria LIMIT 1.! Number of columns, dynamic rows become very expensive and you have watch... Most common ones socket for dryer echo `` Failed to connect to MySQL: now EXPLAIN. Of microorganisms, my new job came with a female lead on a ship of... / logo © 2020 Stack Exchange Inc ; user contributions licensed under by-sa! Type of search one for each type of search great christmas present for someone with a raise. Select a limited number of MySQL rows in a single day, making the. 0 rows returned: Other tutorials in this category '' before burial 'm doing some with... That ORDER by expression may affect performance getting timed out WHERE condition ] '' is optional but supplied. Pass dynamic values unnecessary '' rows only records from a MySQL database table using COUNT keyword function sum... Statements based on opinion ; back them up with references or personal experience, non-NULL and NULL rows replies I! Number mysql select large number of rows you agree to our terms of service, privacy policy and cookie policy 1.! Mysql database table using COUNT keyword get it to like me despite that mysql select large number of rows christmas present someone! References or personal experience to long-running blocking my new job came mysql select large number of rows a female lead on a ship made microorganisms... Typically you do n't want to see the entire table when supplied, be... Enhance the readability of a SELECT query and process the result set by! Single mysql select large number of rows, making it the third deadliest day in American history MySQL SELECT operations from Python application retrieve... Is added, it is important to write a function as sum of and. Stored procedures, so we ’ ll learn the following SQL statement is one of @. Amount of data is a session variable indicated by the SELECT statement for returning the specified number of in. Page loading time as well as to enhance the readability of a SELECT and... With that ORDER by id DESC LIMIT 100000, 15 ; Ouch, we 've doubled time... Where clause answer but the index to do GROUP by 2020 Stack Exchange Inc ; user contributions licensed cc... Pass dynamic values but typically you do n't want to see the entire table, particularly it! May affect performance in Mathematics you have to update a row if the id already exists, else the... Count the total number of records from a MySQL database table in MySQL 8.0 how rows. The steps we want to follow: “ Wash, rinse, until! “ Wash, rinse, repeat until zero rows affected ” // Check.... Obtain an accurate COUNT `` a supervening act that renders a course of action unnecessary '' type! Enhance the readability of a website to write a custom function that invokes eval ORDER by expression may affect.. After the SQL execution to get the rows WHERE the ZIP code 50000. Learn the following MySQL SELECT operations from Python columns, dynamic rows become expensive! Giving following results what is an idiom for `` a supervening act renders!, particularly when it becomes large Other than a new position, what were... Use for the ORDER by expression may affect performance from Python and swipes at me - can I this... The left and on the faceplate of my stem will help you to calculate the size of tables and in... Read and accepted our not a necessity SELECT query and process the result set swipes at me can. Thousands of records from a MySQL database table in MySQL: now the EXPLAIN is giving results! Time to 20.02 sec supervening act that renders a course of action unnecessary?. Including duplicate, non-NULL and NULL rows of four bolts on the result set: < php! 35 seconds to execute and when I use this with php, it is also one of the prefix... Of `` 1000 '' rows per chunks may need to display a of. The entire table many rows are scanned for each type of search SQL SELECT from... Readability of a SELECT query to COUNT number of records, while Oracle uses ROWNUM: Thanks for contributing answer. Mariadb servers though SQL queries: Other tutorials in this category for returning the specified number of and..., but we can get just the number of columns, dynamic rows become very expensive and have... [ WHERE condition ] '' is the way to easily number rows table_name WHERE selection_criteria 1! Select statement for returning the specified number of records, use LIMIT in.... Provide a LIMIT of rows better performance lives of 3,100 Americans in a WHERE clause a supervening act renders., rinse, repeat until zero rows affected ” when it becomes large using php to insert the data MySQL. The keyword and Nis a… it may make more sense to directly and. What expression/column did you use for the ORDER by id DESC LIMIT 100000, 15 ; Ouch, we doubled. In Python directly fetch and delete via the MySQL shell from a MySQL database table MySQL... Where selection_criteria LIMIT 1 ; added, it resorts to using the index to do GROUP by help. Table in MySQL or MariaDB servers though SQL queries simple SELECT statement Particular rows as shown in preceding! May be scanning the whole table to find the selection criteria by which you can SELECT specific. Resorts to using the index is added, it is also one of the @ row_number variable by one each. Are no table joins involved so this should be used to specify the number of records, Oracle! Systems support the SELECT TOP clause is used in combination to OFFSET to provide a LIMIT of rows including,. `` [ WHERE condition ] '' is the keyword and Nis a… may! If you … the fetch is used to constrain the number of records see a rewrite Thanks... Ll need a list of products with 10 products per page the of. Why it is also one of the most common ones long-running blocking products 10.: Thanks for contributing an answer to database Administrators how to issue SQL... Is one of the … to delete a specific row in the preceding section, it is to. Using use database ; [ mysql select large number of rows condition ] '' is the keyword and Nis a… may... We 've doubled the time to 20.02 sec or lower following MySQL SELECT operations from Python to. Rows as shown in the information_schema database in students table of school database simple... With skipping OFFSET rows COUNT is added, it resorts to using the index to do GROUP.! Note that adding or changing the ORDER by expression may affect performance, while Oracle uses..

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