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https://dev.mysql.com/doc/refman/5.7/en/merge-storage-engine.html
“Identical” means that all tables have identical column data types and index information. You cannot merge MyISAM tables in which the columns are listed in a different order, do not have exactly the same data types in corresponding columns, or ... The MERGE storage engine, also known as the MRG_MyISAM engine, is a collection of identical MyISAM tables that can be used as ...
https://dev.mysql.com/doc/refman/5.7/en/internal-temporary-tables.html
Note When using internal_tmp_disk_storage_engine=INNODB, queries that generate on-disk internal temporary tables that exceed InnoDB row or column limits return Row size too large or Too many columns errors. Evaluation of statements that contain an ... In some cases, the server creates internal temporary tables while processing ...
https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html
SQL-92 and earlier does not permit queries for which the select list, HAVING condition, or ORDER BY list refer to nonaggregated columns that are not named in the GROUP BY clause. SQL:1999 and later permits such nonaggregates per optional feature ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-cluster-locks.html
The transaction ID (transid column) is the identifier generated by the NDB API for the transaction requesting or holding the current lock. The mode column shows the lock mode; this is always one of S (indicating a shared lock) or X (an exclusive ...
https://dev.mysql.com/doc/refman/5.7/en/enum.html
An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time. The ENUM type has these advantages: Compact data storage in situations where a column ...See Section 11.3.1, “String Data Type Syntax” for ENUM type syntax and length ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-limits.html
A table can contain a maximum of 1017 columns (raised in MySQL 5.6.9 from the earlier limit of 1000). For example, you might hit this limit with a column prefix index of more than 255 characters on a TEXT or VARCHAR column, assuming a utf8mb3 ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-setup.html
This build option generates two shared libraries in the MySQL plugin directory (plugin_dir) that are required to run the daemon_memcached plugin: libmemcached.so: the memcached daemon plugin to MySQL. Entries in the containers table provide a ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-server-locks.html
The transaction ID shown in the transid column is the identifier generated by the NDB API for the transaction requesting or holding the current lock. The mode column shows the lock mode, which is always one of S (shared lock) or X (exclusive lock).
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-porting-mysql.html
If there is a short numeric primary key column in an InnoDB table, use it as the unique lookup key for memcached by converting the integer to a string value. In any query that performs arithmetic using column values, use the CAST() function to ...
https://dev.mysql.com/doc/refman/5.7/en/binary-varbinary.html
If strict SQL mode is not enabled and you assign a value to a BINARY or VARBINARY column that exceeds the column's maximum length, the value is truncated to fit and a warning is generated. For the latter types, the BINARY attribute does not cause ...