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https://dev.mysql.com/doc/refman/8.0/en/storage-requirements.html
While a NULL itself does not require any storage space, NDB reserves 4 bytes per row if the table definition contains any columns allowing NULL, up to 32 NULL columns. InnoDB Table Storage Requirements NDB Table Storage Requirements Numeric Type ...
https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html
The handling of system variable values by MySQL flow control functions such as IFNULL() and CASE() changed in MySQL 8.0.22; system variable values are now handled as column values of the same character and collation, rather than as constants. The ...
https://dev.mysql.com/doc/refman/8.0/en/using-spatial-indexes.html
The optimizer investigates whether available spatial indexes can be involved in the search for queries that use a function such as MBRContains() or MBRWithin() in the WHERE clause. The following query finds all objects that are in the given ...
https://dev.mysql.com/doc/refman/8.0/en/alter-user.html
with the value for the column key set to JSON null (unquoted, in lower case). ALTER USER [IF EXISTS] user [auth_option] [, user [auth_option]] ... [REQUIRE {NONE | tls_option [[AND] tls_option] ...}] [WITH resource_option [resource_option] ...] ...
https://dev.mysql.com/doc/refman/8.0/en/any-in-some-subqueries.html
The expression is unknown (that is, NULL) if table t2 contains (NULL,NULL,NULL). The expression is TRUE if table t2 contains (21,14,7) because there is a value 7 in t2 that is less than 10. The expression is FALSE if table t2 contains (20,10), or if ...
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-conversion.html
This section describes issues that you may face when converting character data between the utf8mb3 and utf8mb4 character sets. Note This discussion focuses primarily on converting between utf8mb3 and utf8mb4, but similar principles apply to ...
https://dev.mysql.com/doc/refman/8.0/en/counting-rows.html
Counting the total number of animals you have is the same question as “How many rows are in the pet table?” because there is one record per pet. COUNT(*) counts the number of rows, so the query to count your animals looks like this: mysql> ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-check-constraints.html
expr specifies the constraint condition as a boolean expression that must evaluate to TRUE or UNKNOWN (for NULL values) for each row of the table. Prior to MySQL 8.0.16, CREATE TABLE permits only the following limited version of table CHECK ...
https://dev.mysql.com/doc/refman/8.0/en/data-masking-component-usage.html
Thus, even though ssn is defined as VARCHAR(11), if the ssn column has a multibyte character set, it may appear to be longer than 11 bytes when passed to a loadable function, and returns NULL while logging the error. Before using MySQL Enterprise ...
https://dev.mysql.com/doc/refman/8.0/en/data-size.html
It makes SQL operations faster, by enabling better use of indexes and eliminating overhead for testing whether each value is NULL. If you really need NULL values in your tables, use them. Just avoid the default setting that allows NULL values in ...