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https://dev.mysql.com/doc/refman/8.4/en/charset-mysql.html
To display the available character sets, use the INFORMATION_SCHEMA CHARACTER_SETS table or the SHOW CHARACTER SET statement. To list the display collations for a character set, use the INFORMATION_SCHEMA COLLATIONS table or the SHOW COLLATION ...
https://dev.mysql.com/doc/refman/8.4/en/charset-repertoire.html
The repertoire of a character set is the collection of characters in the set. String expressions have a repertoire attribute, which can have two values: ASCII: The expression can contain only ASCII characters; that is, characters in the Unicode ...
https://dev.mysql.com/doc/refman/8.4/en/charset-unicode-utf16.html
The utf16 character set is the ucs2 character set with an extension that enables encoding of supplementary characters: For a BMP character, utf16 and ucs2 have identical storage characteristics: same code values, same encoding, same length. For a ...
https://dev.mysql.com/doc/refman/8.4/en/comparisons-using-subqueries.html
It finds all rows in table t1 containing a value that occurs twice in a given column: SELECT * FROM t1 AS t WHERE 2 = (SELECT COUNT(*) FROM t1 WHERE t1.id = t.id); For a comparison of the subquery to a scalar, the subquery must return a scalar. The ...
https://dev.mysql.com/doc/refman/8.4/en/connection-options.html
This section describes options supported by most MySQL client programs that control how client programs establish connections to the server, whether connections are encrypted, and whether connections are compressed. Command Options for Connection ...These options can be given on the command line or in an option ...
https://dev.mysql.com/doc/refman/8.4/en/constant-folding-optimization.html
Consider the table created by the following statement: CREATE TABLE t (c TINYINT UNSIGNED NOT NULL); The WHERE condition in the query SELECT * FROM t WHERE c < 256 contains the integral constant 256 which is out of range for a TINYINT UNSIGNED ...
https://dev.mysql.com/doc/refman/8.4/en/create-database.html
CREATE DATABASE is not permitted within a session that has an active LOCK TABLES statement. The ENCRYPTION option defines the default database encryption, which is inherited by tables created in the database. If the ENCRYPTION option is not ...
https://dev.mysql.com/doc/refman/8.4/en/date-and-time-type-syntax.html
For example: CREATE TABLE t1 (t TIME(3), dt DATETIME(6), ts TIMESTAMP(0)); The fsp value, if given, must be in the range 0 to 6. (This differs from the standard SQL default of 6, for compatibility with previous MySQL versions.) Any TIMESTAMP or ...
https://dev.mysql.com/doc/refman/8.4/en/drop-function-loadable.html
It requires the DELETE privilege for the mysql system schema because it removes the row from the mysql.func system table that registers the function. DROP FUNCTION also removes the function from the Performance Schema user_defined_functions table ...
https://dev.mysql.com/doc/refman/8.4/en/dynamic-system-variables.html
For a description of the privilege requirements for setting system variables, see Section 7.1.9.1, “System Variable Privileges” The following table lists all dynamic system variables applicable within mysqld. This differs from the ENUM data type ... Many server system variables are dynamic and can be set at ...