Correlated subquery using Group By : Correlated subquery « Subquery « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Subquery » Correlated subquery 
8. 2. 3. Correlated subquery using Group By
4>
5>
6CREATE TABLE Product(
7>     ProductID               int                NOT NULL,
8>     Name                    nvarchar(25)       NOT NULL,
9>     ProductNumber           nvarchar(25)               ,
10>     Color                   nvarchar(15)       NULL,
11>      StandardCost            money              NOT NULL,
12>      Size                    nvarchar(5)        NULL,
13>      Weight                  decimal(82)      NULL,
14>      ProductLine             nchar(20)           NULL,
15>      SellStartDate           datetime           NOT NULL,
16>      SellEndDate             datetime           NULL
17>  )
18>  GO
1insert into Product values(1,'Product A', '1','Red',123.123,'1',1,'ProductLine A','1999-03-22','2000-03-22');
2> GO

(rows affected)
1>
2>
3insert into Product values(2,'Product B', '2','Yellow',234.234,'1',3,'ProductLine B','2000-03-22','2001-03-22');
4> GO

(rows affected)
1>
2>
3insert into Product values(3,'Product C', '3','Pink',345.345,'1',3,'ProductLine V','2001-09-22','2006-02-22');
4> GO

(rows affected)
1>
2>
3insert into Product values(4,'Product D', '4','White',456.456,'1',4,'ProductLine D','2002-08-22','2006-03-22');
4> GO

(rows affected)
1>
2>
3insert into Product values(5,'Product E', '5','Black',567.567,'1',5,'ProductLine E','2003-01-22','2003-04-22');
4> GO

(rows affected)
1>
2>
3insert into Product values(6,'Product F', '6','Blue',678.678,'1',6,'ProductLine W','2004-02-22','2005-05-22');
4> GO

(rows affected)
1>
2>
3insert into Product values(7,'Product G', '7','Drak',789.789,'1',7,'ProductLine Q','2005-03-22','2006-03-22');
4> GO

(rows affected)
1>
2>
3insert into Product values(8,'Product H', '8','Gray',234.123,'1',8,'ProductLine F','2006-04-22','2006-09-22');
4> GO

(rows affected)
1>
2>
3insert into Product values(9,'Product I', '9','Red',543.123,'1',9,'ProductLine R','2007-05-22','2008-03-22');
4> GO

(rows affected)
1>
2>
3insert into Product values(0,'Product J', '0','Gold',765.123,'1',0,'ProductLine J','2008-06-22','2009-03-22');
4> GO

(rows affected)
1>
2>
3>
4>
5>
6CREATE TABLE SalesOrderDetail(
7>     SalesOrderID            int                NOT NULL,
8>     SalesOrderDetailID      int                NOT NULL,
9>     CarrierTrackingNumber   nvarchar(25)       NULL,
10>     OrderQty                smallint           NOT NULL,
11>     ProductID               int                NOT NULL,
12>      SpecialOfferID          int                NOT NULL,
13>      UnitPrice               money              NOT NULL,
14>      UnitPriceDiscount       money              NOT NULL DEFAULT (0.0),
15>      LineTotal               AS ISNULL([UnitPrice(1.0 [UnitPriceDiscount]) [OrderQty]0.0)
16>  );
17>  GO
1>
2insert into SalesOrderDetail values (1,1,'1',1,1,1,$1,$1);
3> GO

(rows affected)
1>
2>
3insert into SalesOrderDetail values (2,2,'2',2,2,2,$2,$2);
4> GO

(rows affected)
1>
2>
3insert into SalesOrderDetail values (3,3,'3',3,3,3,$3,$3);
4> GO

(rows affected)
1>
2>
3insert into SalesOrderDetail values (4,4,'4',4,4,4,$4,$4);
4> GO

(rows affected)
1>
2>
3insert into SalesOrderDetail values (5,5,'5',5,5,5,$5,$5);
4> GO

(rows affected)
1>
2>
3insert into SalesOrderDetail values (6,6,'6',6,6,6,$6,$6);
4> GO

(rows affected)
1>
2>
3insert into SalesOrderDetail values (7,7,'7',7,7,7,$7,$7);
4> GO

(rows affected)
1>
2>
3insert into SalesOrderDetail values (8,8,'8',8,8,8,$8,$8);
4> GO

(rows affected)
1>
2>
3insert into SalesOrderDetail values (9,9,'9',9,9,9,$9,$9);
4> GO

(rows affected)
1>
2>
3>
4>
5SELECT ProductID
6>   , Name
7FROM Product AS P
8WHERE =
9>   (SELECT ProductID
10>   FROM SalesOrderDetail As SD
11>   WHERE P.ProductID = SD.ProductID
12>    GROUP BY ProductID)
13>  GO
ProductID   Name
----------- -------------------------
          Product A

(rows affected)
1>
2> drop table Product;
3> GO
1>
2>
3> drop table SalesOrderDetail;
4> GO
8. 2. Correlated subquery
8. 2. 1. A correlated subquery relies on the main query for its processing.
8. 2. 2. using SELECT DISTINCT or a GROUP BY statement in the inner query
8. 2. 3. Correlated subquery using Group By
8. 2. 4. Correlated subquery using TOP 1
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