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https://dev.mysql.com/doc/refman/9.7/en/replication-encrypted-connections.html
If this option is set to NULL when TLSv1.3 is used (which is the default if you do not set the option), the ciphersuites that are enabled by default are allowed. To use an encrypted connection for the transfer of the binary log required during ...
https://dev.mysql.com/doc/refman/9.7/en/replication-features-differing-tables.html
A column's default value is determined by a number of factors, including its type, whether it is defined with a DEFAULT option, whether it is declared as NULL, and the server SQL mode in effect at the time of its creation; for more information, see ... Source and target tables for replication do not have to be ...
https://dev.mysql.com/doc/refman/9.7/en/replication-privilege-checks-gr.html
Group Replication requires every table that is to be replicated by the group to have a defined primary key, or primary key equivalent where the equivalent is a non-null unique key. You can also use a PRIVILEGE_CHECKS_USER account to secure the two ...
https://dev.mysql.com/doc/refman/9.7/en/reusing-ssl-sessions.html
For example: mysql> ssl_session_data_print ~/private-dir/session.txt Session data are obtained in the form of a null-terminated, PEM encoded ANSI string. MySQL client programs may elect to resume a prior SSL session, provided that the server has ...
https://dev.mysql.com/doc/refman/9.7/en/row-subqueries.html
The expression is unknown (that is, NULL) if the subquery produces no rows. Scalar or column subqueries return a single value or a column of values. A row subquery is a subquery variant that returns a single row and can thus return more than one ...
https://dev.mysql.com/doc/refman/9.7/en/se-csv-limitations.html
All tables that you create using the CSV storage engine must have the NOT NULL attribute on all columns.
https://dev.mysql.com/doc/refman/9.7/en/select.html
This exception may not apply to const or system tables that are used on the NULL-complemented side of an outer join (that is, the right-side table of a LEFT JOIN or the left-side table of a RIGHT JOIN. SELECT [ALL | DISTINCT | DISTINCTROW ] ...
https://dev.mysql.com/doc/refman/9.7/en/show-create-procedure.html
The value displayed for the Create Procedure or Create Function field is NULL if you have only CREATE ROUTINE, ALTER ROUTINE, or EXECUTE. SHOW CREATE PROCEDURE proc_name This statement is a MySQL extension. It returns the exact string that can be ...
https://dev.mysql.com/doc/refman/9.7/en/show-engines.html
row *************************** Engine: BLACKHOLE Support: YES Comment: /dev/null storage engine (anything you write to it disappears) Transactions: NO XA: NO Savepoints: NO *************************** 7. SHOW [STORAGE] ENGINES SHOW ENGINES ...
https://dev.mysql.com/doc/refman/9.7/en/show-profile.html
For values that depend on the getrusage() system call, NULL is returned on systems such as Windows that do not support the call. Note The SHOW PROFILE and SHOW PROFILES statements are deprecated; expect them to be removed in a future MySQL release.