adds the WHERE statement to calculate the average : AVG « Aggregate Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Aggregate Functions » AVG 
9. 2. 4. adds the WHERE statement to calculate the average
6CREATE TABLE CD (
7>      CD_ID              integer  NOT NULL PRIMARY KEY,
8>      CD_Title           varchar(40),
9>      Composer_ID        integer  NOT NULL,
10>      Classif_ID         integer  NOT NULL,
11>      SalesPrice        money,
12>      AverageCost       money)
13> GO
1INSERT into CD VALUES(2000,"John",100,1,16.99,6.99)
2INSERT into CD VALUES(2001,"Chicago 16",107,1,14.99,5.99)
3INSERT into CD VALUES(2002,"Chicago 17",107,1,14.99,5.99)
4INSERT into CD VALUES(2003,"Chicago 18",107,1,14.99,5.99)
5INSERT into CD VALUES(2004,"Greatest Hits",107,1,16.99,7.99)
6INSERT into CD VALUES(2005,"Midnight",101,3,14.99,5.99)
7INSERT into CD VALUES(2006,"Mode",115,3,14.99,5.99)
8INSERT into CD VALUES(2007,"Ultra",115,3,15.99,5.99)
9INSERT into CD VALUES(2008,"Mindcrime",102,4,14.99,5.99)
10INSERT into CD VALUES(2009,"Empire",102,4,14.99,5.99)
11INSERT into CD VALUES(2010,"Land",102,4,12.99,4.99)
12INSERT into CD VALUES(2011,"Night",103,4,11.99,3.99)
13INSERT into CD VALUES(2012,"Pyromania",103,4,14.99,5.99)
14INSERT into CD VALUES(2013,"Hysteria",103,4,14.99,5.99)
15INSERT into CD VALUES(2014,"Hits",103,4,13.99,4.99)
16INSERT into CD VALUES(2015,"Hits 2",104,2,15.99,6.99)
17INSERT into CD VALUES(2016,"Greatest",105,2,14.99,5.99)
18INSERT into CD VALUES(2017,"Hits 3",106,1,13.99,5.99)
19INSERT into CD VALUES(2018,"Deep",108,1,12.99,2.99)
20INSERT into CD VALUES(2019,"Turning",109,1,14.99,5.99)
21INSERT into CD VALUES(2020,"TheHits",109,1,16.99,7.99)
22INSERT into CD VALUES(2021,"Cars",110,1,9.99,3.99)
23INSERT into CD VALUES(2022,"Anthology",110,1,25.99,11.99)
24INSERT into CD VALUES(2023,"City",110,1,14.99,5.99)
25INSERT into CD VALUES(2024,"Rick",111,1,11.99,2.99)
26INSERT into CD VALUES(2025,"Live",112,1,19.99,8.99)
27INSERT into CD VALUES(2026,"Pat",113,1,16.99,6.99)
28INSERT into CD VALUES(2027,"Big",114,1,14.99,5.99)
29INSERT into CD VALUES(2028,"Hurting",114,1,11.99,3.99)
30INSERT into CD VALUES(2029,"Vol 1",116,1,9.99,2.99)
31INSERT into CD VALUES(2030,"Vol 2",116,1,9.99,2.99)
32> GO

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1>
2SELECT AVG(SalesPrice),AVG(AverageCostfrom CD WHERE Classif_ID = 1
3> GO

--------------------- ---------------------
              14.9900                5.9373

(rows affected)
1>
2> drop table CD;
3> GO
9. 2. AVG
9. 2. 1. AVG calculates the average for selected records of numeric data in a column or the average for DISTINCT (unique) values of the selected records.
9. 2. 2. Using DISTINCT in Aggregate Functions
9. 2. 3. A summary query that uses the COUNT, AVG, and SUM functions
9. 2. 4. adds the WHERE statement to calculate the average
9. 2. 5. Selecting titles that sell more than the average.
9. 2. 6. CAST(AVG(dec1) AS dec(5,2))
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