Faster joins and subqueries — new in 5.3 HandlerSocket and faster HANDLER calls — new in 5.3 Dynamic Columns support — new in 5.3 GIS Functionality — new in 5.3 Multi-source replication — new in 10.0
the optimizer is more mature. MySQL can do joins and subqueries but subquery support is more recent, having been added in MySQL 4.1. Consequently, the optimizer has beenbetter tuned for joins than for subqueries in some cases. This has a practical implication you have a subquery that ...
joins against subqueries in the FROM clause. This applies to UNION queries, too. [45] The server generates the output from the execution plan. It thus has the same semantics as the original query, but not necessarily the same text. 46] Strictly speaking, MySQL doesn’t try to ...
All instances of adding and replacing expressions in the select list when transforming subqueries to use derived tables and joins have been changed so that their reference counts are maintained properly. (Bug #34927110) Index Merge (see Index Merge Optimization) should favor ROR-union plans (that...
• For statements with multiple SELECT keywords, such as unions or statements with subqueries, MAX_EXECUTION_TIME applies to the entire statement and must appear after the first SELECT. • It applies to read-only SELECT statements. Statements that are not read only are those that invoke a ...
For more information about the AWS keyring component, seeUsing the component_keyring_aws AWS Keyring Component. For help with migration, seeMigration from AWS keyring plugin. For an overview comparing MySQL keyring components with keyring plugins, seeKeyring Components Versus Keyring Plugins. (WL...
the subquery is re-evaluated only once for each set of differentvalues of the variables from its outer context. For UNCACHEABLE SUBQUERY, thesubquery is re-evaluated for each row of the outer context. Cacheability ofsubqueries is subject to the restrictions detailed in Section 7.9.3.1, “How...
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its foundation. Runs on countless platforms. Mysql can construct queries that can join tables from different databases. Supports both left and right outer joins using both ANSI and ODBC syntax. As of MySQL 4.1 from that release on, MySQL will handle subqueries. Views supported as of release 5...
(Bug #31553323) • In certain cases, the server did not handle multiply-nested subqueries correctly. (Bug #31472704) • A buffer overflow in the client library was fixed. (Bug #30885987) Changes in MySQL 5.6.50 (2020-10-19, General Availability) • Functionality Added or Changed •...