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Search Results
https://dev.mysql.com/doc/refman/5.7/en/data-masking-functions.html
If a string return value should be in a different character set, convert it. The following example shows how to convert the result of gen_rnd_email() to the utf8mb4 character set: SET @email = CONVERT(gen_rnd_email() USING utf8mb4); It may also be ...
https://dev.mysql.com/doc/refman/5.7/en/date-and-time-type-syntax.html
The date and time data types for representing temporal values are DATE, TIME, DATETIME, TIMESTAMP, and YEAR. For the DATE and DATETIME range descriptions, “supported” means that although earlier values might work, there is no guarantee. MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/encryption-functions.html
If you want to store these results, use a column with a VARBINARY or BLOB binary string data type. This avoids potential problems with trailing space removal or character set conversion that would change data values, such as may occur if you use a ...
https://dev.mysql.com/doc/refman/5.7/en/explain-output.html
The EXPLAIN statement provides information about how MySQL executes statements. EXPLAIN returns a row of information for each table used in the SELECT statement. It lists the tables in the output in the order that MySQL would read them while ...
https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html
SQL-92 and earlier does not permit queries for which the select list, HAVING condition, or ORDER BY list refer to nonaggregated columns that are not named in the GROUP BY clause. SQL:1999 and later permits such nonaggregates per optional feature ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-auto-increment-handling.html
InnoDB provides a configurable locking mechanism that can significantly improve scalability and performance of SQL statements that add rows to tables with AUTO_INCREMENT columns. To use the AUTO_INCREMENT mechanism with an InnoDB table, an ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-import.html
ndb_import imports CSV-formatted data, such as that produced by mysqldump --tab, directly into NDB using the NDB API. ndb_import requires a connection to an NDB management server (ndb_mgmd) to function; it does not require a connection to a MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-conflict-resolution.html
Requirements Source Column Control Conflict Resolution Control Conflict Resolution Functions Conflict Resolution Exceptions Table Conflict Detection Status Variables Examples When using a replication setup involving multiple sources (including ...
https://dev.mysql.com/doc/refman/5.7/en/optimizer-hints.html
One means of control over optimizer strategies is to set the optimizer_switch system variable (see Section 8.9.2, “Switchable Optimizations”). Changes to this variable affect execution of all subsequent queries; to affect one query differently ...
https://dev.mysql.com/doc/refman/5.7/en/optimizer-issues.html
MySQL uses a cost-based optimizer to determine the best way to resolve a query. In many cases, MySQL can calculate the best possible query plan, but sometimes MySQL does not have enough information about the data at hand and has to make ...