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https://dev.mysql.com/doc/refman/5.7/en/subqueries.html
A subquery is a SELECT statement within another statement. All subquery forms and operations that the SQL standard requires are supported, as well as a few features that are MySQL-specific. Here is an example of a subquery: SELECT * FROM t1 WHERE column1 = (SELECT column1 FROM t2);
https://www.w3resource.com/mysql/subqueries/index.php
MySQL subquery is a SELECT query that is embedded in the main SELECT statement. The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. Also see Row Subqueries, Subqueries with EXISTS or NOT EXISTS, Correlated Subqueries and Subqueries in the FROM Clause.
https://stackoverflow.com/questions/4154493/mysql-view-support-subquery
Generally SELECT statement can have SELECT subquery but contrary to other DBMS' MySQL's limitation is that one cannot create a view from such a select statement which contains subquery. This limitation can be easily overcome if one creates one view for subquery and then use this view for creation of originally wanted view.
https://dev.mysql.com/doc/refman/8.0/en/subquery-errors.html
Unsupported subquery syntax: ERROR 1235 (ER_NOT_SUPPORTED_YET) SQLSTATE = 42000 Message = "This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'" This means that MySQL does not support statements like the following: SELECT * FROM t1 WHERE s1 IN (SELECT s2 FROM t2 ORDER BY s1 LIMIT 1)
https://dev.mysql.com/doc/refman/8.0/en/optimizing-subqueries.html
Some subqueries can be transformed to joins for compatibility with older versions of MySQL that do not support subqueries. However, in some cases, converting a subquery to a join may improve performance. See Section 13.2.11.12, “Rewriting Subqueries as Joins”.
https://www.mysqltutorial.org/mysql-subquery/
Summary: in this tutorial, we will show you how to use the MySQL subquery to write complex queries and explain the correlated subquery concept. A MySQL subquery is a query nested within another query such as SELECT, INSERT, UPDATE or DELETE. In addition, a subquery can be nested inside another subquery.
https://dev.mysql.com/doc/refman/5.7/en/correlated-subqueries.html
For subqueries in HAVING or ORDER BY clauses, MySQL also looks for column names in the outer select list. For certain cases, a correlated subquery is optimized. For example: val IN (SELECT key_val FROM tbl_name WHERE correlated_condition) Otherwise, they are inefficient and likely to be slow.
https://dev.mysql.com/doc/refman/5.7/en/subquery-restrictions.html
MySQL does not support LIMIT in subqueries for certain subquery operators: mysql> SELECT * FROM t1 WHERE s1 IN (SELECT s2 FROM t2 ORDER BY s1 LIMIT 1); ERROR 1235 (42000): This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery' MySQL permits a subquery to refer to a stored function that has data-modifying side effects such ...
https://mariadb.com/kb/en/subquery-limitations/
Correlated Subqueries. Subqueries in the FROM clause cannot be correlated subqueries. They cannot be evaluated for each row of the outer query since they are evaluated to produce a result set during when the query is executed. Stored Functions. A subquery can refer to a stored function which modifies data. This is an extension to the SQL ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-errors.html
Unsupported subquery syntax: ERROR 1235 (ER_NOT_SUPPORTED_YET) SQLSTATE = 42000 Message = "This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'" This means that MySQL does not support statements like the following: SELECT * FROM t1 WHERE s1 IN (SELECT s2 FROM t2 ORDER BY s1 LIMIT 1)
https://dev.mysql.com/doc/refman/5.7/en/subqueries.html
A subquery is a SELECT statement within another statement. All subquery forms and operations that the SQL standard requires are supported, as well as a few features that are MySQL-specific. Here is an example of a subquery: SELECT * FROM t1 WHERE column1 = (SELECT column1 FROM t2);
https://dev.mysql.com/doc/refman/8.0/en/optimizing-subqueries.html
Some subqueries can be transformed to joins for compatibility with older versions of MySQL that do not support subqueries. However, in some cases, converting a subquery to a join may improve performance. See Section 13.2.11.12, “Rewriting Subqueries as Joins”.
https://dev.mysql.com/doc/refman/5.7/en/subquery-restrictions.html
MySQL does not support LIMIT in subqueries for certain subquery operators: mysql> SELECT * FROM t1 WHERE s1 IN (SELECT s2 FROM t2 ORDER BY s1 LIMIT 1); ERROR 1235 (42000): This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery' MySQL permits a subquery to refer to a stored function that has data-modifying side effects such ...
https://dev.mysql.com/doc/refman/8.0/en/comparisons-using-subqueries.html
MySQL also permits this construct: non_subquery_operand LIKE (subquery) At one time the only legal place for a subquery was on the right side of a comparison, and you might still find some old DBMSs that insist on this. Here is an example of a common-form subquery comparison that you cannot do with a join.
https://dev.mysql.com/doc/refman/5.7/en/correlated-subqueries.html
A correlated subquery is a subquery that contains a reference to a table that also appears in the outer query. For example: SELECT * FROM t1 WHERE column1 = ANY (SELECT column1 FROM t2 WHERE t2.column2 = t1.column2); Notice that the subquery contains a reference to a column of t1, even though the subquery's FROM clause does not mention a table t1.
https://stackoverflow.com/questions/206062/mysql-view-with-subquery-in-the-from-clause-limitation
MySQL: View with Subquery in the FROM Clause Limitation. Ask Question Asked 11 years, ... Even AWS announced the support of 5.7 on RDS The only reason you might not wont to upgrade is if you use some app server (say Hybris) which does not support 5.7 yet. ... MySql VIEW remove subquery in FROM condition. 0. MYSQL - cant create view.
https://www.w3resource.com/mysql/subqueries/index.php
MySQL subquery is a SELECT query that is embedded in the main SELECT statement. The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. Also see Row Subqueries, Subqueries with EXISTS or NOT EXISTS, Correlated Subqueries and Subqueries in the FROM Clause.
https://mariadb.com/kb/en/subquery-limitations/
SELECT * FROM staff WHERE name IN (SELECT NAME FROM customer ORDER BY name LIMIT 1); ERROR 1235 (42000): This version of MariaDB doesn 't yet support ' LIMIT & IN / ALL / ANY / SOME subquery ' is not. Modifying and Selecting from the Same Table. It's not possible to both modify and select from the same table in a subquery. For example:
https://stackoverflow.com/questions/324935/mysql-with-clause
You can find some more information about databases that support SQL:1999's various features on Wikipedia. MySQL has traditionally lagged a bit in support for the SQL standard, whereas commercial databases like Oracle, SQL Server (recently), and DB2 have followed them a bit more closely. PostgreSQL is typically pretty standards compliant as well.
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