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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-characteristics.html
The name of the performance_schema database is lowercase, as are the names of tables within it. Many tables in the performance_schema database are read only and cannot be modified: mysql> TRUNCATE TABLE performance_schema.setup_instruments; ERROR ...
https://dev.mysql.com/doc/refman/5.7/en/primary-key-optimization.html
The primary key for a table represents the column or set of columns that you use in your most vital queries. Query performance benefits from the NOT NULL optimization, because it cannot include any NULL values. With the InnoDB storage engine, the ...
https://dev.mysql.com/doc/refman/5.7/en/problems-with-alias.html
An alias can be used in a query select list to give a column a different name. This restriction is imposed because when the WHERE clause is evaluated, the column value may not yet have been determined. In the select list of a query, a quoted column ...
https://dev.mysql.com/doc/refman/5.7/en/programs-overview.html
Oracle Corporation also provides the MySQL Workbench GUI tool, which is used to administer MySQL servers and databases, to create, execute, and evaluate queries, and to migrate schemas and data from other relational database management systems for ...Later sections provide a more detailed description of each one, with the exception of NDB Cluster ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-invoked.html
Replication of invoked features such as loadable functions and stored programs (stored procedures and functions, triggers, and events) provides the following characteristics: The effects of the feature are always replicated. The following ...
https://dev.mysql.com/doc/refman/5.7/en/reset-master.html
Issue RESET MASTER on the source to clean up the test queries. RESET MASTER Warning Use this statement with caution to ensure you do not lose any wanted binary log file data and GTID execution history. For a server where binary logging is enabled ...
https://dev.mysql.com/doc/refman/5.7/en/rewriting-subqueries.html
Also, on some occasions, it is not only possible to rewrite a query without a subquery, but it can be more efficient to make use of some of these techniques rather than to use subqueries. Prior to SQL-92, outer joins did not exist, so subqueries ...
https://dev.mysql.com/doc/refman/5.7/en/row-constructor-optimization.html
For example, these two statements are semantically equivalent: SELECT * FROM t1 WHERE (column1,column2) = (1,1); SELECT * FROM t1 WHERE column1 = 1 AND column2 = 1; In addition, the optimizer handles both expressions the same way. The optimizer is ...
https://dev.mysql.com/doc/refman/5.7/en/secure-client-programming.html
Client applications that access MySQL should use the following guidelines to avoid interpreting external data incorrectly or exposing sensitive information. Handle External Data Properly Handle MySQL Error Messages Properly Handle External Data ...
https://dev.mysql.com/doc/refman/5.7/en/selecting-columns.html
If you do not want to see entire rows from your table, just name the columns in which you are interested, separated by commas.