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https://dev.mysql.com/doc/refman/8.0/en/example-user-variables.html
You can employ MySQL user variables to remember results without having to store them in temporary variables in the client.
https://dev.mysql.com/doc/refman/8.0/en/examples.html
Here are examples of how to solve some common problems with MySQL. Some of the examples use the table shop to hold the price of each article (item number) for certain traders (dealers). Supposing that each trader has a single fixed price per ...
https://dev.mysql.com/doc/refman/8.0/en/explain-extended.html
As of MySQL 8.0.12, extended information is available for SELECT, DELETE, INSERT, REPLACE, and UPDATE statements. Here is an example of extended EXPLAIN output: mysql> EXPLAIN SELECT t1.a, t1.a IN (SELECT t2.a FROM t2) FROM t1\G ... The EXPLAIN ...
https://dev.mysql.com/doc/refman/8.0/en/federated-usagenotes.html
The following items indicate features that the FEDERATED storage engine does and does not support: The remote server must be a MySQL server. The insert_id and timestamp options are not propagated to the data provider. The remote table that a ...
https://dev.mysql.com/doc/refman/8.0/en/fixed-point-types.html
In MySQL, NUMERIC is implemented as DECIMAL, so the following remarks about DECIMAL apply equally to NUMERIC. The DECIMAL and NUMERIC types store exact numeric data values. These types are used when it is important to preserve exact precision, for ...
https://dev.mysql.com/doc/refman/8.0/en/general-installation-issues.html
For binary distributions, see the instructions at Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries” or the corresponding section for your platform if available. To build MySQL from source, use the instructions in Section 2.8, ... The immediately following sections contain the information necessary to choose, download, and verify your ...
https://dev.mysql.com/doc/refman/8.0/en/generated-column-index-optimizations.html
You can see this using EXPLAIN: mysql> EXPLAIN SELECT * FROM t1 WHERE f1 + 1 > 9\G *************************** 1. That is also apparent in the rewritten query available in the extended EXPLAIN information displayed by SHOW WARNINGS: mysql> SHOW ...
https://dev.mysql.com/doc/refman/8.0/en/group-by-optimization.html
In some cases, MySQL is able to do much better than that and avoid creation of temporary tables by using index access. With this access method, MySQL uses the property of some index types that the keys are ordered (for example, BTREE). If the GROUP ... The most general way to satisfy a GROUP BY clause is to scan the whole table and create a new temporary table where all rows from each group are consecutive, and then use this temporary table to discover groups and apply aggregate functions (if ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-configuring-online-group.html
Important For the coordinator to be able to configure group wide actions on a running group, all members must be running MySQL 8.0.13 or higher and have the functions installed. The operation is therefore rejected if any server running MySQL Server ... You can configure an online group while Group Replication is running by using a set of functions, which rely on a group action ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-distributed-recovery-fault.html
In MySQL 8.0.17 and later, for state transfer from the binary log, the joiner only selects a donor that is running a lower or equal patch version of MySQL Server compared to itself. Because this method of state transfer uses the existing MySQL ...