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https://dev.mysql.com/doc/refman/8.0/en/sys-sys-get-config.html
Parameters in_variable_name VARCHAR(128): The name of the configuration option for which to return the value. in_default_value VARCHAR(128): The default value to return if the configuration option is not found in the sys_config table. Given a ...
https://dev.mysql.com/doc/refman/8.0/en/type-conversion.html
For information about connection character sets, see Section 12.4, “Connection Character Sets and Collations”.) This means that such a conversion results in a character (nonbinary) string (a CHAR, VARCHAR, or LONGTEXT value), except in the case ... When an operator is used with operands of different types, type conversion occurs to make the operands ...
https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html
The result type is TEXT or BLOB unless group_concat_max_len is less than or equal to 512, in which case the result type is VARCHAR or VARBINARY. This section describes aggregate functions that operate on sets of values. They are often used with a ...
https://dev.mysql.com/doc/refman/8.0/en/atomic-ddl.html
An atomic DDL statement combines the data dictionary updates, storage engine operations, and binary log writes associated with a DDL operation into a single, atomic operation. The operation is either committed, with applicable changes persisted to ...
https://dev.mysql.com/doc/refman/8.0/en/charset-binary-collations.html
Nonbinary strings (as stored using the CHAR, VARCHAR, and TEXT data types) have a character set and collation other than binary. For nonbinary strings (CHAR, VARCHAR, and TEXT values), the string collation pad attribute determines treatment in ...
https://dev.mysql.com/doc/refman/8.0/en/charset-collation-implementations.html
MySQL implements several types of collations: Simple collations for 8-bit character sets This kind of collation is implemented using an array of 256 weights that defines a one-to-one mapping from character codes to weights. It is a case-insensitive ...
https://dev.mysql.com/doc/refman/8.0/en/charset-conversion.html
If the column has a nonbinary data type (CHAR, VARCHAR, TEXT), its contents should be encoded in the column character set, not some other character set. To convert a binary or nonbinary string column to use a particular character set, use ALTER ...
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-sets.html
This section describes the collations available for Unicode character sets and their differentiating properties. MySQL supports multiple Unicode character sets: utf8mb4: A UTF-8 encoding of the Unicode character set using one to four bytes per ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/en/column-indexes.html
Note Prefix limits are measured in bytes, whereas the prefix length in CREATE TABLE, ALTER TABLE, and CREATE INDEX statements is interpreted as number of characters for nonbinary string types (CHAR, VARCHAR, TEXT) and number of bytes for binary ...