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https://dev.mysql.com/doc/refman/8.0/en/scalar-subqueries.html
In MySQL 8.0.19 and later, the preceding query can also be written like this, using TABLE: SELECT (TABLE t2) FROM t1; A scalar subquery can be part of an expression, but remember the parentheses, even if the subquery is an operand that provides an ... In its simplest form, a subquery is a scalar subquery that returns a single ...
https://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html
The MySQL server has many operating parameters, which you can change at server startup using command-line options or configuration files (option files). For general instructions on setting parameters at startup or runtime, see Section 7.1.7, ...
https://dev.mysql.com/doc/refman/8.0/en/sys-execute-prepared-stmt.html
Thus, this procedure is useful primarily for executing dynamic statements on a one-time basis. Example mysql> CALL sys.execute_prepared_stmt('SELECT COUNT(*) FROM mysql.user'); +----------+ | COUNT(*) | +----------+ | 15 | +----------+ . Given an ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-views.html
The sys schema contains many views that summarize Performance Schema tables in various ways. Most of these views come in pairs, such that one member of the pair has the same name as the other member, plus a x$ prefix. The view with the x$ prefix ...
https://dev.mysql.com/doc/refman/8.0/en/view-restrictions.html
In this case, the view is stored in a temporary table and thus you are not really selecting from the table in a subquery and modifying it at the same time. (This is another reason you might wish to force MySQL to use the temptable algorithm by ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-performance-timers-table.html
For a cycle timer, the frequency is generally related to the CPU speed. TIMER_RESOLUTION Indicates the number of timer units by which timer values increase. If a timer has a resolution of 10, its value increases by 10 each time. TIMER_OVERHEAD The ...For an explanation of how event timing occurs, see Section 29.4.1, “Performance Schema Event ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-system-variables.html
This occurs even if the new statement wait time is less than that of the current sample statement. The default value is calculated at server build time based on the number of commands in the client/server protocol and the number of SQL statement ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-thread-trx-info.html
Returns a JSON object containing information about a given thread. The information includes the current transaction, and the statements it has already executed, derived from the Performance Schema events_transactions_current and ...
https://dev.mysql.com/doc/refman/8.0/en/adding-character-set.html
This section discusses the procedure for adding a character set to MySQL. To use the following instructions, you must have a MySQL source distribution. The proper procedure depends on whether the character set is simple or complex: If the character ...
https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-select-into-table.html
For example: INSERT INTO tbl_temp2 (fld_id) SELECT tbl_temp1.fld_order_id FROM tbl_temp1 WHERE tbl_temp1.fld_order_id > 100; Alternatively, you can use SELECT ... The same syntax can also be used inside stored routines using cursors and local ...