Mysql subquery result in "where" clause - Stack Overflow
2011年12月21日 · A subquery is a SELECT statement within another statement. Starting with MySQL 4.1, all subquery forms and operations that the SQL standard requires are supported, as well as a few features that are MySQL-specific.
mysql if function - subquery as a condition - Stack Overflow
2012年12月12日 · I believe the following query is self explanatory: SELECT IF (SELECT COUNT(*) FROM mytable > 0, 'yes', 'no'); Why doesn't it work? And how should I correct it?
sql - MySQL: WHERE IN any of subqueries - Stack Overflow
2021年1月26日 · From the other side UNION instead of UNION ALL may make sense when each separate subquery returns huge percent of duplicates and compacting factor is high enough (approx. over 20). – Akina Commented Jan 26, 2021 at 8:10
How do you use the "WITH" clause in MySQL? - Stack Overflow
MySQL prior to version 8.0 doesn't support the WITH clause (CTE in SQL Server parlance; Subquery Factoring in Oracle), so you are left with using: TEMPORARY tables; DERIVED tables ; inline views (effectively what the WITH clause represents - they are interchangeable) The request for the feature dates back to 2006.
mysql - subquery in select statement vs subquery in FROM …
2021年6月1日 · What you are describing as a "subquery in the SELECT clause is a scalar subquery. The value is a replacement for a literal value, so it can only return one column. If the scalar returns zero rows, then the value is NULL. Note that scalar subqueries are sometimes extended to support multiple columns.
mySQL: Subquery to array? - Stack Overflow
This came up as the top result when i searched for "mysql 5.7 subquery into array", so even though the question is old it could help others to mention that since MySQL 5.7.22 a possible solution is to use the aggretate function JSON_ARRAYAGG(), though with JOIN rather than a subquery. Alteration of the example given by Silver Light:
Selecting multiple columns/fields in MySQL subquery
2011年4月16日 · So the question part. Is there a way to get multiple columns from a single subquery or should I use two subqueries (MySQL is smart enough to group them?) or is joining the following way to go: [[attribute to language] to translation] (joining 3 tables seems like a worse performance than subquery).
mysql - Solution to "subquery returns more than 1 row" error
2015年1月27日 · SELECT * FROM Students WHERE Marks = (SELECT MAX(Marks) FROM Students) --Subquery returns only 1 value SELECT * FROM Students WHERE Marks IN (SELECT Marks FROM Students ORDER BY Marks DESC LIMIT 10) - …
How to use a subquery in the FROM clause in MySQL?
Use a subquery in the FROM clause to only retrieve invoices from chamber 'H' and the invoice amount of larger than 10000 and join the result with the voyages table using the number column. Project to only retrieve the boatname and the invoice amount of the join result.
Referencing outer query's tables in a subquery - Stack Overflow
Is it possible to reference an outer query in a subquery with MySQL? Yes, it is definitely possible. MySQL 8.0.14 and above: 13.2.11.9 Lateral Derived Tables. A derived table cannot normally refer to (depend on) columns of preceding tables in the same FROM clause.