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https://dev.mysql.com/doc/refman/5.7/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.
https://dev.mysql.com/doc/refman/5.7/en/show-triggers.html
This is a TIMESTAMP(2) value (with a fractional part in hundredths of seconds) for triggers created in MySQL 5.7.2 or later, NULL for triggers created prior to 5.7.2. SHOW TRIGGERS [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TRIGGERS ...
https://dev.mysql.com/doc/refman/5.7/en/silent-column-changes.html
Columns that are part of a PRIMARY KEY are made NOT NULL even if not declared that way. In some cases, MySQL silently changes column specifications from those given in a CREATE TABLE or ALTER TABLE statement. These might be changes to a data type, ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-materialization.html
oe [NOT] IN (SELECT ie ...) The predicate is IN or NOT IN and a result of UNKNOWN (NULL) has the same meaning as a result of FALSE. The optimizer uses materialization to enable more efficient subquery processing. Materialization speeds up query ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-file-io-type.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. These views summarize file I/O, grouped by host and event type. By default, ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-file-io.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. By default, rows are sorted by descending total file I/O latency. The ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-stages.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. By default, rows are sorted by host and descending total latency. The ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-statement-latency.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. The host_summary_by_statement_latency and x$host_summary_by_statement_latency ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-statement-type.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. These views summarize informaion about statements executed, grouped by host ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. These views summarize statement activity, file I/O, and connections, grouped ...