Contents
When to use cross join or inner join in MariaDB?
In MariaDB, CROSS JOIN is a syntactic equivalent to INNER JOIN (they can replace each other). In standard SQL, they are not equivalent. INNER JOIN is used with an ON clause, CROSS JOIN is used otherwise. In general, parentheses can be ignored in join expressions containing only inner join operations.
How to optimize min and Max in MariaDB?
MariaDB and MySQL can optimize the MIN () and MAX () functions to be a single row lookup in the following cases: There is only one table used in the SELECT . You only have constants, MIN () and MAX () in the SELECT part.
How to optimize Cross joins in MySQL?
Cross joins, where there is no join condition for a table, can also be optimized to a few key lookups: MariaDB and MySQL support loose index scan, which can speed up certain GROUP BY queries.
What are the rules for type conversion in MariaDB?
Otherwise type conversion takes place according to the rules described at Type Conversion, but applied to all the three arguments. DATE, DATETIME and TIMESTAMP examples. Omitting the time component compares against 00:00, so later times on the same date are not returned: Login or signup to receive notifications when this page changes.
How to restrict the cycle clause in MariaDB?
RESTRICT The CYCLE clause enables CTE cycle detection, avoiding excessive or infinite loops, MariaDB supports a relaxed, non-standard grammar. WITH RECURSIVE ( ) CYCLE SET TO DEFAULT USING
What to do if multiple MariaDB processes are running?
If multiple MariaDB Server process are running on the same server, then at minimum, you will need to ensure that the different instances do not use the same datadir, port, and socket. The following example shows these options set in an option file: The above values are the defaults.
What do you need to know about subqueries in MariaDB?
Documentation on the JOIN, UNION, EXCEPT and INTERSECT clauses, and on subqueries. Querying from multiple tables. Queries within queries. Combine the results from multiple SELECT statements into a single result set. Subtraction of two result sets.