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https://dev.mysql.com/doc/refman/8.0/en/with.html
CTEs are similar to tables created with CREATE [TEMPORARY] TABLE but need not be defined or dropped explicitly. A common table expression (CTE) is a named temporary result set that exists within the scope of a single statement and that can be ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-waits-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored wait event, so there is no system variable for configuring the table size. Of the tables that contain wait event rows, events_waits_current is the ...The THREAD_ID and EVENT_ID values taken together uniquely identify the ...
https://dev.mysql.com/doc/refman/8.0/en/table-size-limit.html
If you need a MyISAM table that is larger than the default limit and your operating system supports large files, the CREATE TABLE statement supports AVG_ROW_LENGTH and MAX_ROWS options. The effective maximum table size for MySQL databases is ...For ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-temp-table-info.html
INNODB_TEMP_TABLE_INFO provides information about user-created InnoDB temporary tables that are active in the InnoDB instance. Create a simple InnoDB temporary table: mysql> CREATE TEMPORARY TABLE t1 (c1 INT PRIMARY KEY) ENGINE=INNODB; Query ...It ...
https://dev.mysql.com/doc/refman/8.0/en/lateral-derived-tables.html
A derived table cannot normally refer to (depend on) columns of preceding tables in the same FROM clause. As of MySQL 8.0.14, a derived table may be defined as a lateral derived table to specify that such references are permitted. Nonlateral ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-error-log-table.html
As of MySQL 8.0.22, depending on error log configuration, the server can also write the most recent error events to the Performance Schema error_log table. Granting the SELECT privilege for the error_log table thus gives clients and applications ...
https://dev.mysql.com/doc/refman/8.0/en/table-locking.html
Workarounds for Locking Performance Issues The following items describe some ways to avoid or reduce contention caused by table locking: Consider switching the table to the InnoDB storage engine, either using CREATE TABLE ... You might have to ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-row-format.html
When a table is created with ROW_FORMAT=DYNAMIC, InnoDB can store long variable-length column values (for VARCHAR, VARBINARY, and BLOB and TEXT types) fully off-page, with the clustered index record containing only a 20-byte pointer to the overflow ... The row format of a table determines how its rows are physically stored, which in turn can affect the performance of queries and DML ...As more rows fit into a single disk page, ...
https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html
A table creation statement that would result in a partitioned table using a storage engine without such support fails with an error (ER_CHECK_NOT_IMPLEMENTED) in MySQL 8.0. Removal of MAXDB means that the TIMESTAMP data type for CREATE TABLE or ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-tables.html
Given these considerations, the CREATE TABLE statement for the event table might look like this: mysql> CREATE TABLE event (name VARCHAR(20), date DATE, type VARCHAR(15), remark VARCHAR(255)); As with the pet table, it is easiest to load the initial ... The pet table keeps track of which pets you ...An event type ...