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https://dev.mysql.com/doc/refman/8.4/en/replication-features-row-searches.html
A unique index where every column in the index has a NOT NULL attribute. If the algorithm is able to select a primary key or a unique index where every column in the index has a NOT NULL attribute, it uses this index to iterate over the rows in the ... When a replica using row-based replication format applies an UPDATE or DELETE operation, it must search the relevant table for the matching ...
https://dev.mysql.com/doc/refman/8.4/en/string-type-syntax.html
CHAR(0) is also quite nice when you need a column that can take only two values: A column that is defined as CHAR(0) NULL occupies only one bit and can take only the values NULL and '' (the empty string). A string object that can have only one ...
https://dev.mysql.com/doc/refman/8.4/en/where-optimization.html
This is also done for any NOT NULL expression when used with only one table. A table that is used with a WHERE clause on a PRIMARY KEY or a UNIQUE index, where all index parts are compared to constant expressions and are defined as NOT NULL. This ...
https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-0.html
Attempting to set any of them in MySQL 8.4 raises an error. Attempting to use these together in CREATE TABLE and ALTER TABLE statements now causes an Incorrect column specifier for column error (ER_WRONG_FIELD_SPEC). (Bug #35992145) Group ...(Bug ...
https://dev.mysql.com/doc/relnotes/connector-j/en/news-8-0-14.html
(Bug #28971500) X DevAPI: getDefaultSchema() now returns null when no default schema has been set for the Session. (WL #12462) Bugs Fixed X DevAPI: Connector/J returned a NullPointerException when an application tried to establish an XProtocol ...
https://dev.mysql.com/doc/relnotes/connector-j/en/news-8-0-17.html
(Bug #29807741, Bug #95210) ResultSetMetaData.getTableName() returned null when no applicable results could be returned for a column. (Bug #29452669, Bug #94585) ResultSetImpl.getObject(), when autoboxing a value of a primitive type retrieved from a ... Version 8.0.17 is the latest General Availability release of the 8.0 series of MySQL ...
https://dev.mysql.com/doc/mysql-ai/9.4/en/mys-ai-aml-using-a-recommendation-model-items-to-users.html
For the option to set the user name, you can set it to NULL. mysql> CALL sys.ML_MODEL_LOAD(@model, NULL); The following example uses the model handle. mysql> CALL sys.ML_MODEL_LOAD('recommendation_use_case', NULL); Make predictions for the test ...
https://dev.mysql.com/doc/mysql-ai/9.4/en/mys-ai-aml-using-a-recommendation-model-users-to-items.html
For the option to set the user name, you can set it to NULL. mysql> CALL sys.ML_MODEL_LOAD(@model, NULL); The following example uses the model handle. mysql> CALL sys.ML_MODEL_LOAD('recommendation_use_case', NULL); Make predictions for the test ...
https://dev.mysql.com/doc/internals/en/bas-ext.html
Return Values Return value is a null-terminated string array of storage engine extensions. Purpose Defines the file extensions used by the storage engine. Synopsis virtual const char ** bas_ext ( ); ; Description This is the bas_ext method. It is ...
https://dev.mysql.com/doc/internals/en/event-content-writing-conventions.html
Strings are written in varying formats: A string may be written to a fixed-length field and null-padded (with 0x00 bytes) on the right. For null-terminated strings that are preceded by a length field, the length does not include the terminating null ... Event contents are written using these conventions: Numbers are written in little-endian format (least significant byte first), unless otherwise ...