FOUND_ROWS()

MySQL 8.4

The SQL_CALC_FOUND_ROWS query modifier and accompanying FOUND_ROWS() function are deprecated; expect them to be removed in a future version of MySQL. Execute the query with LIMIT, and then a second query with COUNT(*) and without LIMIT to determine whether there are additional rows. For example, instead of these queries:

Syntax

MYSQL

SELECT SQL_CALC_FOUND_ROWS * FROM tbl_name WHERE id > 100 LIMIT 10;
SELECT FOUND_ROWS();

Examples

Example

Use these queries instead:

MYSQL

SELECT SQL_CALC_FOUND_ROWS * FROM tbl_name WHERE id > 100 LIMIT 10;
SELECT FOUND_ROWS();

Example 2

COUNT(*) is subject to certain optimizations. SQL_CALC_FOUND_ROWS causes some optimizations to be disabled.

MYSQL

SELECT * FROM tbl_name WHERE id > 100 LIMIT 10;
SELECT COUNT(*) FROM tbl_name WHERE id > 100;

Example 3

A SELECT statement may include a LIMIT clause to restrict the number of rows the server returns to the client. In some cases, it is desirable to know how many rows the statement would have returned without the LIMIT, but without running the statement again. To obtain this row count, include an SQL_CALC_FOUND_ROWS option in the SELECT statement, and then invoke FOUND_ROWS() afterward:

MYSQL

SELECT SQL_CALC_FOUND_ROWS * FROM tbl_name
WHERE id > 100 LIMIT 10;
SELECT FOUND_ROWS();

Example 4

The second SELECT returns a number indicating how many rows the first SELECT would have returned had it been written without the LIMIT clause.

MYSQL

SELECT SQL_CALC_FOUND_ROWS * FROM ... ;
SET @rows = FOUND_ROWS();