Selecting titles that sell more than the average. : AVG « Aggregate Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Aggregate Functions » AVG 
9. 2. 5. Selecting titles that sell more than the average.
3>
4>
5CREATE TABLE titles(
6>    title_id       varchar(20),
7>    title          varchar(80)       NOT NULL,
8>    type           char(12)          NOT NULL,
9>    pub_id         char(4)               NULL,
10>    price          money                 NULL,
11>    advance        money                 NULL,
12>    royalty        int                   NULL,
13>    ytd_sales      int                   NULL,
14>    notes          varchar(200)          NULL,
15>    pubdate        datetime          NOT NULL
16)
17> GO
1>
2insert titles values ('1''Secrets',   'popular_comp', '1389', $20.00, $8000.00, 104095,'Note 1','06/12/94')
3insert titles values ('2''The',       'business',     '1389', $19.99, $5000.00, 104095,'Note 2','06/12/91')
4insert titles values ('3''Emotional', 'psychology',   '0736', $7.99,  $4000.00, 103336,'Note 3','06/12/91')
5insert titles values ('4''Prolonged', 'psychology',   '0736', $19.99, $2000.00, 104072,'Note 4','06/12/91')
6insert titles values ('5''With',      'business',     '1389', $11.95, $5000.00, 103876,'Note 5','06/09/91')
7insert titles values ('6''Valley',    'mod_cook',     '0877', $19.99, $0.00,    122032,'Note 6','06/09/91')
8insert titles values ('7''Any?',      'trad_cook',    '0877', $14.99, $8000.00, 104095,'Note 7','06/12/91')
9insert titles values ('8''Fifty',     'trad_cook',    '0877', $11.95, $4000.00, 141509,'Note 8','06/12/91')
10> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2CREATE TABLE sales(
3>    stor_id        char(4)           NOT NULL,
4>    ord_num        varchar(20)       NOT NULL,
5>    ord_date       datetime          NOT NULL,
6>    qty            smallint          NOT NULL,
7>    payterms       varchar(12)       NOT NULL,
8>    title_id       varchar(80)
9)
10> GO
1insert sales values('1''QA7442.3', '09/13/94', 75'ON Billing','1')
2insert sales values('2''D4482',    '09/14/94', 10'Ne60',    '1')
3insert sales values('3''N914008',  '09/14/94', 20'Ne30',    '2')
4insert sales values('4''N914014',  '09/14/94', 25'Ne30',    '3')
5insert sales values('5''423LL922', '09/14/94', 15'ON Billing','3')
6insert sales values('6''423LL930', '09/14/94', 10'ON Billing','2')
7> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2>      SELECT    titles.title, titles.price
3>      FROM      titles JOIN sales ON sales.title_id = titles.title_id
4>      WHERE     sales.qty >
5>                (SELECT AVG(qty)
6>                FROM sales)
7> GO
title                                                                            price
-------------------------------------------------------------------------------- ---------------------
Secrets                                                                                        20.0000

(rows affected)
1>
2> drop table sales;
3> drop table titles;
4> 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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