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https://dev.mysql.com/doc/refman/5.7/en/assignment-operators.html
Table 12.6 Assignment Operators Name Description := Assign a value = Assign a value (as part of a SET statement, or as part of the SET clause in an UPDATE statement) := Assignment operator. Causes the user variable on the left hand side of the ...
https://dev.mysql.com/doc/refman/5.7/en/date-calculations.html
You determine which animals these are by checking whether the death value is NULL. MySQL provides several functions that you can use to perform calculations on dates, for example, to calculate ages or extract parts of dates. To determine how many ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-buffer-pool-tables.html
Example 14.6 Querying System Data in the INNODB_BUFFER_PAGE Table This query provides an approximate count of pages that contain system data by excluding pages where the TABLE_NAME value is either NULL or includes a slash / or period . The InnoDB ...
https://dev.mysql.com/doc/refman/5.7/en/sys-sys-config.html
The value is NULL if the row has not been changed since the sys schema was installed. (For example, the variable corresponding to the diagnostics.include_raw option is @sys.diagnostics.include_raw.) If the user-defined variable exists in the current ... This table contains sys schema configuration options, one row per ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-upgrade.html
--debug[=debug_options], -# [debug_options] Command-Line Format --debug[=#] Type String Default Value d:t:O,/tmp/mysql_upgrade.trace Write a debugging log. --default-auth=plugin Command-Line Format --default-auth=plugin Type String A hint about ...
https://dev.mysql.com/doc/refman/5.7/en/dynamic-format.html
Dynamic-format tables have these characteristics: All string columns are dynamic except those with a length less than four. Each row is preceded by a bitmap that indicates which columns contain the empty string (for string columns) or zero (for ...
https://dev.mysql.com/doc/refman/5.7/en/converting-tables-to-innodb.html
Consider using an auto-increment column if there is not another stable, unique, non-null, numeric column to use. You can designate the former primary key columns as UNIQUE NOT NULL to enforce the same constraints as the PRIMARY KEY clause, that is, ... If you have MyISAM tables that you want to convert to InnoDB for better reliability and scalability, review the following guidelines and tips before ...
https://dev.mysql.com/doc/refman/5.7/en/json-utility-functions.html
This section documents utility functions that act on JSON values, or strings that can be parsed as JSON values. The value supplied must be a JSON value or a valid string representation of a JSON value. Special characters in string scalars and key ...JSON_PRETTY() prints out a JSON value in a format that is easy to ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-limitations-transactions.html
A number of limitations exist in NDB Cluster with regard to the handling of transactions. The NDBCLUSTER storage engine supports only the READ COMMITTED transaction isolation level. To ensure that a given transaction reads only before or after ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-tables.html
At this time, there are no active replica threads, so the THREAD_ID columns are NULL and the SERVICE_STATE columns have a value of OFF. After STOP SLAVE, the THREAD_ID columns become NULL and the SERVICE_STATE columns for threads that no longer ...