mssql subqueries
USE AdventureWorks2016;
GO
SELECT Ord.SalesOrderID, Ord.OrderDate,
(SELECT MAX(OrdDet.UnitPrice)
FROM Sales.SalesOrderDetail AS OrdDet
WHERE Ord.SalesOrderID = OrdDet.SalesOrderID) AS MaxUnitPrice
FROM Sales.SalesOrderHeader AS Ord;
GONESTED QUERY SQL
SELECT column_name [, column_name ]
FROM table1 [, table2 ]
WHERE column_name OPERATOR
(SELECT column_name [, column_name ]
FROM table1 [, table2 ]
[WHERE])why we use subquery in sql
We use subquery in order to get aggregate value in column without grouping datasubquery in sql
UPDATE dataflair_emp1
SET salary=35000
WHERE emp_id = ( SELECT emp_id
FROM dataflair_emp1
WHERE post='Sr.Manager');
select * from dataflair_emp1;subquery in sql
SELECT column_name
FROM table_name1
WHERE VALUE IN
(SELECT column_name
FROM table_name2
WHERE condition)subquery in sql
DELETE FROM dataflair_emp1
WHERE emp_id IN ( SELECT emp_id
FROM dataflair_emp2
WHERE age=25);
select * from dataflair_emp1;Copyright © 2021 Codeinu
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