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https://dev.mysql.com/doc/refman/9.7/en/srjsapi-session.html
The Session object is always available as the session property of the global object. Session has the methods listed here: createSchema(String name): Creates a database having the specified name, and returns the corresponding Schema object. Returns ...
https://dev.mysql.com/doc/refman/9.7/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/9.7/en/sys-innodb-lock-waits.html
locked_table_partition The name of the locked partition, if any; NULL otherwise. locked_table_subpartition The name of the locked subpartition, if any; NULL otherwise. This field reports NULL if the session that issued the blocking query becomes ...
https://dev.mysql.com/doc/refman/9.7/en/system-schema.html
row *************************** CATALOG_NAME: def SCHEMA_NAME: mysql DEFAULT_CHARACTER_SET_NAME: utf8mb4 DEFAULT_COLLATION_NAME: utf8mb4_0900_ai_ci SQL_PATH: NULL DEFAULT_ENCRYPTION: NO *************************** 2. row *************************** ...It contains tables that store information required by the MySQL server as it ...
https://dev.mysql.com/doc/refman/9.7/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/refman/9.7/en/arithmetic-functions.html
(See Section 13.1, “Numeric Data Types”.) / Division: mysql> SELECT 3/5; -> 0.60 Division by zero produces a NULL result: mysql> SELECT 102/(1-1); -> NULL A division is calculated with BIGINT arithmetic only if performed in a context where its ... Table 14.9 Arithmetic Operators Name Description %, MOD Modulo operator * Multiplication operator + Addition operator - Minus operator - Change the sign of the argument / Division operator DIV Integer division The usual arithmetic operators are ...
https://dev.mysql.com/doc/refman/9.7/en/audit-log-filter-definitions.html
The following list describes the permitted predefined functions for function items: audit_log_exclude_accounts_is_null() Checks whether the audit_log_exclude_accounts system variable is NULL. Important The audit_log plugin is deprecated, and is ...
https://dev.mysql.com/doc/refman/9.7/en/charset-connection.html
To tell the server to perform no conversion of result sets or error messages, set character_set_results to NULL or binary: SET character_set_results = NULL; SET character_set_results = binary; For more information about character sets and error ...
https://dev.mysql.com/doc/refman/9.7/en/constraint-foreign-key.html
The available referential actions are RESTRICT, CASCADE, SET NULL, and NO ACTION (the default). Foreign keys let you cross-reference related data across tables, and foreign key constraints help keep this spread-out data consistent. MySQL supports ...
https://dev.mysql.com/doc/refman/9.7/en/csv-storage-engine.html
The CSV storage engine stores data in text files using comma-separated values format. The CSV storage engine is always compiled into the MySQL server. To examine the source for the CSV engine, look in the storage/csv directory of a MySQL source ...