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https://dev.mysql.com/doc/refman/9.7/en/rewriter-query-rewrite-plugin-usage.html
row *************************** id: 1 pattern: SELECT ? pattern_database: NULL replacement: SELECT ? + 1 enabled: YES message: NULL pattern_digest: NULL normalized_pattern: NULL The rule specifies a pattern template indicating which SELECT ... To ...
https://dev.mysql.com/doc/refman/9.7/en/selecting-all.html
For example, you may happen to think that the birth date for Bowser doesn't seem quite right. Consulting your original pedigree papers, you find that the correct birth year should be 1989, not 1979. Fix only the erroneous record with an UPDATE ...
https://dev.mysql.com/doc/refman/9.7/en/selecting-rows.html
As shown in the preceding section, it is easy to retrieve an entire table. But typically you don't want to see the entire table, particularly when it becomes large. Instead, you're usually more interested in answering a particular question, in ...
https://dev.mysql.com/doc/refman/9.7/en/show-events.html
row *************************** Db: myschema Name: e_daily Definer: jon@ghidora Time zone: SYSTEM Type: RECURRING Execute at: NULL Interval value: 1 Interval field: DAY Starts: 2018-08-08 11:06:34 Ends: NULL Status: ENABLED Originator: 1 ... SHOW ...
https://dev.mysql.com/doc/refman/9.7/en/tracing-example.html
(Observe that it could have a match, were the operator a null-safe equals <=>). Now we can examine the trace, whose first column (QUERY), containing the original statement to be traced, is shown here: SELECT * FROM ...
https://dev.mysql.com/doc/refman/9.7/en/xml-functions.html
If any of the arguments to UpdateXML() are NULL, the function returns NULL. Table 14.16 XML Functions Name Description ExtractValue() Extract a value from an XML string using XPath notation UpdateXML() Return replaced XML fragment This section ...
https://dev.mysql.com/doc/refman/9.7/en/assignment-operators.html
Table 14.6 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/9.7/en/create-procedure.html
Its initial value is NULL within the procedure, and its value is visible to the caller when the procedure returns. By default, a stored routine is associated with the default database. To associate the routine explicitly with a given database, ...
https://dev.mysql.com/doc/refman/9.7/en/create-table-gipks.html
row *************************** Table: auto_0 Create Table: CREATE TABLE `auto_0` ( `c1` varchar(50) DEFAULT NULL, `c2` int DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci 1 row in set (0.00 sec) mysql> SHOW CREATE ...
https://dev.mysql.com/doc/refman/9.7/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 ...