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https://dev.mysql.com/doc/refman/5.7/en/innodb-auto-increment-handling.html
To use the AUTO_INCREMENT mechanism with an InnoDB table, an AUTO_INCREMENT column must be defined as the first or only column of some index such that it is possible to perform the equivalent of an indexed SELECT MAX(ai_col) lookup on the table to ... InnoDB provides a configurable locking mechanism that can significantly improve scalability and performance of SQL statements that add rows to tables with AUTO_INCREMENT ...
https://dev.mysql.com/doc/refman/5.7/en/create-table-ndb-comment-options.html
NDB_COLUMN can be used in a column comment to set the size of the blob parts table column used for storing parts of blob values by NDB to its maximum. NDB 7.5 and 7.6 support a single column comment option MAX_BLOB_PART_SIZE; syntax for this option ... NDB_COLUMN Options NDB_TABLE Options It is possible to set a number of options specific to NDB Cluster in the table comment or column comments of an NDB ...
https://dev.mysql.com/doc/refman/5.7/en/comparisons-using-subqueries.html
The most common use of a subquery is in the form: non_subquery_operand comparison_operator (subquery) Where comparison_operator is one of these operators: = > < >= <= <> != <=> For example: ... WHERE 'a' = (SELECT column1 FROM t1) MySQL also ...
https://dev.mysql.com/doc/refman/5.7/en/example-maximum-row.html
Task: Find the number, dealer, and price of the most expensive article.
https://dev.mysql.com/doc/refman/5.7/en/example-maximum-column.html
“What is the highest item number?” SELECT MAX(article) AS article FROM shop; +---------+ | article | +---------+ | 4 | +---------+ .
https://dev.mysql.com/doc/refman/5.7/en/example-maximum-column-group.html
SELECT article, MAX(price) AS price FROM shop GROUP BY article ORDER BY article; +---------+-------+ | article | price | +---------+-------+ | 0001 | 3.99 | | 0002 | 10.99 | | 0003 | 1.69 | | 0004 | 19.95 | +---------+-------+ .
https://dev.mysql.com/doc/refman/5.7/en/repair-table.html
With myisamchk --safe-recover, you can also use options that REPAIR TABLE does not support, such as --max-record-length.) REPAIR TABLE table catches and throws any errors that occur while copying table statistics from the old corrupted file to the ...[QUICK] [EXTENDED] [USE_FRM] REPAIR TABLE repairs a possibly corrupted table, for certain storage engines ...
https://dev.mysql.com/doc/refman/5.7/en/example-auto-increment.html
Use the smallest integer data type for the AUTO_INCREMENT column that is large enough to hold the maximum sequence value you need. For example, if you use TINYINT, the maximum permissible sequence number is 127. In this case, the generated value for ...You can also explicitly assign 0 to the column to generate sequence numbers, unless the NO_AUTO_VALUE_ON_ZERO SQL mode is ...
https://dev.mysql.com/doc/refman/5.7/en/error-creating-innodb.html
In particular, any MAX value in the innodb_data_file_path option is a hard limit, and exceeding that limit causes a fatal error. The troubleshooting steps for InnoDB I/O problems depend on when the problem occurs: during startup of the MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/derived-table-optimization.html
The optimizer handles derived tables and view references the same way: It avoids unnecessary materialization whenever possible, which enables pushing down conditions from the outer query to derived tables and produces more efficient execution plans.