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https://dev.mysql.com/doc/refman/5.7/en/show-create-procedure.html
It returns the exact string that can be used to re-create the named stored procedure. If you do not have privileges for the routine itself, the value displayed for the Create Procedure or Create Function column is NULL. SHOW CREATE PROCEDURE ...
https://dev.mysql.com/doc/refman/5.7/en/signal.html
It can be an SQLSTATE value (a 5-character string literal) or a condition_name that refers to a named condition previously defined with DECLARE ... It is illegal to assign NULL to a condition information item in a SIGNAL statement. SIGNAL provides ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statement-analysis.html
The statement_analysis and x$statement_analysis views have these columns: query The normalized statement string. db The default database for the statement, or NULL if there is none. full_scan The total number of full table scans performed by ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-errors-or-warnings.html
The statements_with_errors_or_warnings and x$statements_with_errors_or_warnings views have these columns: query The normalized statement string. db The default database for the statement, or NULL if there is none. These views display normalized ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-full-table-scans.html
The statements_with_full_table_scans and x$statements_with_full_table_scans views have these columns: query The normalized statement string. db The default database for the statement, or NULL if there is none. These views display normalized ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-runtimes-in-95th-percentile.html
The statements_with_runtimes_in_95th_percentile and x$statements_with_runtimes_in_95th_percentile views have these columns: query The normalized statement string. db The default database for the statement, or NULL if there is none. These views list ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-sorting.html
The statements_with_sorting and x$statements_with_sorting views have these columns: query The normalized statement string. db The default database for the statement, or NULL if there is none. total_latency The total wait time of timed occurrences of ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-temp-tables.html
The statements_with_temp_tables and x$statements_with_temp_tables views have these columns: query The normalized statement string. db The default database for the statement, or NULL if there is none. These views list normalized statements that have ...
https://dev.mysql.com/doc/refman/5.7/en/charset-unicode-utf32.html
The utf32 character set is fixed length (like ucs2 and unlike utf16). utf32 uses 32 bits for every character, unlike ucs2 (which uses 16 bits for every character), and unlike utf16 (which uses 16 bits for some characters and 32 bits for others).
https://dev.mysql.com/doc/refman/5.7/en/declare-local-variable.html
If the DEFAULT clause is missing, the initial value is NULL. type [DEFAULT value] This statement declares local variables within stored programs. To provide a default value for a variable, include a DEFAULT clause. The value can be specified as an ...