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https://dev.mysql.com/doc/refman/5.7/en/xml-functions.html
Table 12.16 XML Functions Name Description ExtractValue() Extract a value from an XML string using XPath notation UpdateXML() Return replaced XML fragment This section discusses XML and related functionality in MySQL. Note It is possible to obtain ...
https://dev.mysql.com/doc/refman/5.7/en/alter-table-partition-operations.html
Partitioning-related clauses for ALTER TABLE can be used with partitioned tables for repartitioning, to add, drop, discard, import, merge, and split partitions, and to perform partitioning maintenance. Simply using a partition_options clause with ...
https://dev.mysql.com/doc/refman/5.7/en/any-in-some-subqueries.html
The expression is unknown (that is, NULL) if table t2 contains (NULL,NULL,NULL). The expression is TRUE if table t2 contains (21,14,7) because there is a value 7 in t2 that is less than 10. The expression is FALSE if table t2 contains (20,10), or if ...
https://dev.mysql.com/doc/refman/5.7/en/bit-functions.html
mysql> SELECT 5 & ~1; -> 4 BIT_COUNT(N) Returns the number of bits that are set in the argument N as an unsigned 64-bit integer, or NULL if the argument is NULL. binary: Any kind of binary string argument, including a hexadecimal literal, bit ...
https://dev.mysql.com/doc/refman/5.7/en/charset-unicode-conversion.html
This section describes issues that you may face when converting character data between the utf8mb3 and utf8mb4 character sets. Note This discussion focuses primarily on converting between utf8mb3 and utf8mb4, but similar principles apply to ...
https://dev.mysql.com/doc/refman/5.7/en/constraint-invalid-data.html
If you try to store NULL into a column that does not take NULL values, an error occurs for single-row INSERT statements. MySQL 5.7.5 and later uses strict SQL mode by default, which treats invalid values such that the server rejects them and aborts ...
https://dev.mysql.com/doc/refman/5.7/en/counting-rows.html
Counting the total number of animals you have is the same question as “How many rows are in the pet table?” because there is one record per pet. COUNT(*) counts the number of rows, so the query to count your animals looks like this: mysql> ...
https://dev.mysql.com/doc/refman/5.7/en/data-size.html
It makes SQL operations faster, by enabling better use of indexes and eliminating overhead for testing whether each value is NULL. If you really need NULL values in your tables, use them. Just avoid the default setting that allows NULL values in ...
https://dev.mysql.com/doc/refman/5.7/en/events-configuration.html
row *************************** Id: 1 User: root Host: localhost db: NULL Command: Query Time: 0 State: NULL Info: show processlist *************************** 2. row *************************** Id: 2 User: event_scheduler Host: localhost db: NULL ... Events are executed by a special event scheduler thread; when we refer to the Event Scheduler, we actually refer to this ...
https://dev.mysql.com/doc/refman/5.7/en/explain-extended.html
row *************************** id: 1 select_type: PRIMARY table: t1 type: index possible_keys: NULL key: PRIMARY key_len: 4 ref: NULL rows: 4 filtered: 100.00 Extra: Using index *************************** 2. row *************************** id: 2 ... For SELECT statements, the EXPLAIN statement produces extra (“extended”) information that is not part of EXPLAIN output but can be viewed by issuing a SHOW WARNINGS statement following ...