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https://dev.mysql.com/doc/refman/5.7/en/subqueries.html
We say that the subquery is nested within the outer query, and in fact it is possible to nest subqueries within other subqueries, to a considerable depth. The main advantages of subqueries are: They allow queries that are structured so that it is ...
https://dev.mysql.com/doc/refman/5.7/en/trigger-syntax.html
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 13.1.20, “CREATE TRIGGER Statement”, and Section 13.1.31, “DROP TRIGGER Statement”. Here is a simple example that associates a ...
https://dev.mysql.com/doc/refman/5.7/en/alter-user.html
ALTER USER permits these resource_option values: MAX_QUERIES_PER_HOUR count, MAX_UPDATES_PER_HOUR count, MAX_CONNECTIONS_PER_HOUR count For all accounts named by the statement, these options restrict how many queries, updates, and connections to the ... ALTER USER [IF EXISTS] user [auth_option] [, user [auth_option]] ...
https://dev.mysql.com/doc/refman/5.7/en/assignment-operators.html
Table 12.6 Assignment Operators Name Description := Assign a value = Assign a value (as part of a SET statement, or as part of the SET clause in an UPDATE statement) := Assignment operator. Causes the user variable on the left hand side of the ...
https://dev.mysql.com/doc/refman/5.7/en/binary-log.html
The binary log contains “events” that describe database changes such as table creation operations or changes to table data. It also contains events for statements that potentially could have made changes (for example, a DELETE which matched no ...
https://dev.mysql.com/doc/refman/5.7/en/built-in-function-reference.html
The following table lists each built-in (native) function and operator and provides a short description of each one. For a table listing functions that are loadable at runtime, see Section 12.2, “Loadable Function Reference”. ->> Return value ...
https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html
The client sends SQL statements, such as queries, over the session connection. A “connection” is what a client program makes when it connects to the server, to begin a session within which it interacts with the server. The server sends ...
https://dev.mysql.com/doc/refman/5.7/en/create-logfile-group.html
CREATE LOGFILE GROUP logfile_group ADD UNDOFILE 'undo_file' [INITIAL_SIZE [=] initial_size] [UNDO_BUFFER_SIZE [=] undo_buffer_size] [REDO_BUFFER_SIZE [=] redo_buffer_size] [NODEGROUP [=] nodegroup_id] [WAIT] [COMMENT [=] 'string'] ENGINE [=] ...
https://dev.mysql.com/doc/refman/5.7/en/create-table-foreign-keys.html
Example queries are show here: mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN \G *************************** 1. MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which ...
https://dev.mysql.com/doc/refman/5.7/en/create-table-secondary-indexes.html
A secondary index defined on a virtual column is sometimes referred to as a “virtual index”. A secondary index may be created on one or more virtual columns or on a combination of virtual columns and regular columns or stored generated columns.