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https://dev.mysql.com/doc/refman/8.0/en/example-auto-increment.html
Note For a multiple-row insert, LAST_INSERT_ID() and mysql_insert_id() actually return the AUTO_INCREMENT key from the first of the inserted rows. For example, if the animals table contained indexes PRIMARY KEY (grp, id) and INDEX (id), MySQL would ...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/8.0/en/information-schema-table-reference.html
The following table summarizes all available INFORMATION_SCHEMA tables. For greater detail, see the individual table descriptions. Table 28.1 INFORMATION_SCHEMA Tables Table Name Description Introduced Deprecated ADMINISTRABLE_ROLE_AUTHORIZATIONS ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-ddl-operations.html
Foreign key constraints can make a TRUNCATE statement work like a regular DELETE statement, in which case a sequence of commands like DROP TABLE and CREATE TABLE might be fastest. Many DDL operations on tables and indexes (CREATE, ALTER, and DROP ...
https://dev.mysql.com/doc/refman/8.0/en/replication-privilege-checks-gr.html
Group Replication requires every table that is to be replicated by the group to have a defined primary key, or primary key equivalent where the equivalent is a non-null unique key. Rather than using the checks carried out by the ... From MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-syntax-warnings.html
SQL Compression Syntax Warnings and Errors for File-Per-Table Tablespaces When innodb_strict_mode is enabled (the default), specifying ROW_FORMAT=COMPRESSED or KEY_BLOCK_SIZE in CREATE TABLE or ALTER TABLE statements produces the following error if ... This section describes syntax warnings and errors that you may encounter when using the table compression feature with file-per-table tablespaces and general ...
https://dev.mysql.com/doc/refman/8.0/en/merge-storage-engine.html
There it is indexed but not as a PRIMARY KEY because a MERGE table cannot enforce uniqueness over the set of underlying tables. The MERGE storage engine, also known as the MRG_MyISAM engine, is a collection of identical MyISAM tables that can be ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-storage-layout.html
In InnoDB, having a long PRIMARY KEY (either a single column with a lengthy value, or several columns that form a long composite value) wastes a lot of disk space. The primary key value for a row is duplicated in all the secondary index records that ... Once your data reaches a stable size, or a growing table has increased by tens or some hundreds of megabytes, consider using the OPTIMIZE TABLE statement to reorganize the table and compact any wasted ...
https://dev.mysql.com/doc/refman/8.0/en/storage-requirements.html
InnoDB Table Storage Requirements NDB Table Storage Requirements Numeric Type Storage Requirements Date and Time Type Storage Requirements String Type Storage Requirements Spatial Type Storage Requirements JSON Storage Requirements The storage ...
https://dev.mysql.com/doc/refman/8.0/en/condition-filtering.html
In join processing, prefix rows are those rows passed from one table in a join to the next. In general, the optimizer attempts to put tables with low prefix counts early in the join order to keep the number of row combinations from increasing ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-general-table-reference.html
The following table summarizes INFORMATION_SCHEMA general tables. For greater detail, see the individual table descriptions. Table 28.2 INFORMATION_SCHEMA General Tables Table Name Description Introduced Deprecated ADMINISTRABLE_ROLE_AUTHORIZATIONS ...