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https://dev.mysql.com/doc/refman/5.7/en/example-maximum-row.html
Task: Find the number, dealer, and price of the most expensive article.
https://dev.mysql.com/doc/refman/5.7/en/faqs-mysql-cluster.html
There is no user-facing mechanism for influencing this selection, which is completely automatic; the fact that it is automatic is a key part of NDB Cluster's internal architecture. However, it also means that queries that could otherwise use range ... In the following section, we answer questions that are frequently asked about NDB Cluster and the NDB storage ...
https://dev.mysql.com/doc/refman/5.7/en/flush.html
This operation has no effect on tables used for the general query log (see Section 5.4.1, “Selecting General Query Log and Slow Query Log Output Destinations”). This operation has no effect on tables used for the slow query log (see Section ...| ...
https://dev.mysql.com/doc/refman/5.7/en/functions.html
Expressions can be used at several points in SQL statements, such as in the ORDER BY or HAVING clauses of SELECT statements, in the WHERE clause of a SELECT, DELETE, or UPDATE statement, or in SET statements. Rather than showing examples in this ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-adding-instances.html
At this point, the group has one member in it, server s1, which has some data in it. It is now time to expand the group by adding the other two servers configured previously. 17.2.1.6.1 Adding a Second Instance In order to add a second instance, ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-restarting-group.html
You can get this by issuing the following statement: mysql> SELECT @@GLOBAL.GTID_EXECUTED The set of certified transactions on the group_replication_applier channel. Group Replication is designed to ensure that the database service is continuously ...
https://dev.mysql.com/doc/refman/5.7/en/index-extensions.html
EXPLAIN for the query produces this result: mysql> EXPLAIN SELECT COUNT(*) FROM t1 WHERE i1 = 3 AND d = '2000-01-01'\G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: t1 type: ref possible_keys: ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-processlist-table.html
DB The default database for the thread, or NULL if none has been selected. For example, if a CALL statement executes a stored procedure that is executing a SELECT statement, the INFO value shows the SELECT statement. The following statements are ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-tables-table.html
In such cases, use SELECT COUNT(*) to obtain an accurate count. A more accurate method of obtaining this information in such cases is to query the INFORMATION_SCHEMA PARTITIONS table, as shown in this example: SELECT SUM(DATA_FREE) FROM ...The ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-deadlocks-handling.html
Use EXPLAIN SELECT to determine which indexes the MySQL server regards as the most appropriate for your queries. If you can afford to permit a SELECT to return data from an old snapshot, do not add a FOR UPDATE or LOCK IN SHARE MODE clause to it.