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https://dev.mysql.com/doc/refman/8.0/en/create-index.html
CREATE [UNIQUE | FULLTEXT | SPATIAL] INDEX index_name [index_type] ON tbl_name (key_part,...) [index_option] [algorithm_option | lock_option] ... This guideline is especially important for InnoDB tables, where the primary key determines the ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-ndb-comment-options.html
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 table. Table-level options for controlling read from any replica and partition balance can be ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-secondary-indexes.html
Adding or dropping a secondary index on a virtual column is an in-place operation. 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 ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-select.html
If errors occur while copying data to the table, the table is automatically dropped and not created. You can create one table from another by adding a SELECT statement at the end of the CREATE TABLE statement: CREATE TABLE new_tbl [AS] SELECT * ...
https://dev.mysql.com/doc/refman/8.0/en/deallocate-prepare.html
{DEALLOCATE | DROP} PREPARE stmt_name To deallocate a prepared statement produced with PREPARE, use a DEALLOCATE PREPARE statement that refers to the prepared statement name. Attempting to execute a prepared statement after deallocating it results ...
https://dev.mysql.com/doc/refman/8.0/en/declare-condition.html
DECLARE condition_name CONDITION FOR condition_value condition_value: { mysql_error_code | SQLSTATE [VALUE] sqlstate_value } The DECLARE ... CONDITION statement declares a named error condition, associating a name with a condition that needs ...
https://dev.mysql.com/doc/refman/8.0/en/default-privileges.html
To set up additional accounts, see Section 8.2.8, “Adding Accounts, Assigning Privileges, and Dropping Accounts”. The MySQL installation process involves initializing the data directory, including the grant tables in the mysql system schema ...
https://dev.mysql.com/doc/refman/8.0/en/full-text-adding-collation.html
Warning User-defined collations are deprecated; you should expect support for them to be removed in a future version of MySQL. As of MySQL 8.0.33, the server issues a warning for any use of COLLATE user_defined_collation in an SQL statement; a ...
https://dev.mysql.com/doc/refman/8.0/en/gone-away.html
You are using a Windows client and the server had dropped the connection (probably because wait_timeout expired) before the command was issued. This section also covers the related Lost connection to server during query error. The most common ...
https://dev.mysql.com/doc/refman/8.0/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 ...