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https://dev.mysql.com/doc/refman/8.0/en/subqueries.html
All subquery forms and operations that the SQL standard requires are supported, as well as a few features that are MySQL-specific. is the outer query (or outer statement), and (SELECT column1 FROM t2) is the subquery. We say that the subquery is ...
https://dev.mysql.com/doc/refman/8.0/en/window-function-optimization.html
Semijoins are not applicable to window function optimization because semijoins apply to subqueries in WHERE and JOIN ... The workaround is to define the window in a WINDOW clause and refer to the window name in the OVER clauses. For faster ...
https://dev.mysql.com/doc/refman/8.0/en/out-of-range-and-overflow.html
If no restrictive modes are enabled, MySQL clips the value to the appropriate endpoint of the column data type range and stores the resulting value instead. When a floating-point or fixed-point column is assigned a value that exceeds the range ...
https://dev.mysql.com/doc/refman/8.0/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. Expressions can be written using values ...An expression that contains NULL always produces a NULL value unless otherwise indicated in the documentation for a particular function or ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-key-types.html
MySQL Keyring supports keys of different types (encryption algorithms) and lengths: The available key types depend on which keyring plugin is installed. (The lower limits for keyring_aws are imposed by the AWS KMS interface, not the keyring ...The ...
https://dev.mysql.com/doc/refman/8.0/en/macos-installation-prefpane.html
The MySQL Installation Package includes a MySQL preference pane that enables you to start, stop, and control automated startup during boot of your MySQL installation. This preference pane is installed by default, and is listed under your system's ...Figure 2.20 MySQL Preference Pane: Location The MySQL preference pane is installed with the same DMG file that installs MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/merge-table-advantages.html
For example, you can put data from different months into separate tables, compress some of them with myisampack, and then create a MERGE table to use them as one. You can split a large read-only table based on some criteria, and then put individual ... MERGE tables can help you solve the following problems: Easily manage a set of log ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-max-allowed-packet.html
Row-based replication sends all columns and column values for updated rows from the source to the replica, including values of columns that were not actually changed by the update. max_allowed_packet sets an upper limit on the size of any single ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-myisam-bulk-data-loading.html
This does not update any indexes and therefore is very fast. If you use locking, connections 2, 3, and 4 probably do not finish before 1 or 5, but the total time should be about 40% faster. INSERT, UPDATE, and DELETE operations are very fast in ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-queries-myisam.html
If you often need to calculate results such as counts based on information from a lot of rows, it may be preferable to introduce a new table and update the counter in real time. Try to avoid complex SELECT queries on MyISAM tables that are updated ...This updates a value for each index part that indicates the average number of rows that have the same ... Some general tips for speeding up queries on MyISAM tables: To help MySQL better ...