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https://dev.mysql.com/doc/refman/5.7/en/scalar-subqueries.html
In its simplest form, a subquery is a scalar subquery that returns a single value. A scalar subquery is a simple operand, and you can use it almost anywhere a single column value or literal is legal, and you can expect it to have those ...
https://dev.mysql.com/doc/refman/5.7/en/semijoins.html
A semijoin is a preparation-time transformation that enables multiple execution strategies such as table pullout, duplicate weedout, first match, loose scan, and materialization. The optimizer uses semijoin strategies to improve subquery execution, ...
https://dev.mysql.com/doc/refman/5.7/en/server-options.html
When you start the mysqld server, you can specify program options using any of the methods described in Section 4.2.2, “Specifying Program Options”. The most common methods are to provide options in an option file or on the command line.
https://dev.mysql.com/doc/refman/5.7/en/stored-programs-logging.html
The binary log contains information about SQL statements that modify database contents. This information is stored in the form of “events” that describe the modifications. (Binary log events differ from scheduled event stored objects.) The ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-restrictions.html
In general, you cannot modify a table and select from the same table in a subquery. For example, this limitation applies to statements of the following forms: DELETE FROM t WHERE ... FROM t ...); Exception: The preceding prohibition does not apply ...
https://dev.mysql.com/doc/refman/5.7/en/timestamp-initialization.html
TIMESTAMP and DATETIME columns can be automatically initializated and updated to the current date and time (that is, the current timestamp). For any TIMESTAMP or DATETIME column in a table, you can assign the current timestamp as the default value, ...
https://dev.mysql.com/doc/refman/5.7/en/timestamp-lookups.html
Temporal values are stored in TIMESTAMP columns as UTC values, and values inserted into and retrieved from TIMESTAMP columns are converted between the session time zone and UTC. (This is the same type of conversion performed by the CONVERT_TZ() ...
https://dev.mysql.com/doc/refman/5.7/en/tracing-example.html
Now we can examine the trace, whose first column (QUERY), containing the original statement to be traced, is shown here: SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE\G *************************** 1. row *************************** QUERY: SELECT ...
https://dev.mysql.com/doc/refman/5.7/en/alter-table-examples.html
For NDB tables, it is also possible to change the storage type used for a table or column. row *************************** Table: t1 Create Table: CREATE TABLE `t2` ( `c1` int(11) DEFAULT NULL ) /*!50100 TABLESPACE ts_1 STORAGE DISK */ ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-filter-definitions.html
For information about using JSON data in MySQL, see Section 11.5, “The JSON Data Type”. Filter definitions have this form, where actions indicates how filtering takes place: { "filter": actions } The following discussion describes permitted ...