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4> CREATE TABLE titles(
5> title_id varchar(20),
6> title varchar(80) NOT NULL,
7> type char(12) NOT NULL,
8> pub_id char(4) NULL,
9> price money NULL,
10> advance money NULL,
11> royalty int NULL,
12> ytd_sales int NULL,
13> notes varchar(200) NULL,
14> pubdate datetime NOT NULL
15> )
16> GO
1>
2> insert titles values ('1', 'Secrets', 'popular_comp', '1389', $20.00, $8000.00, 10, 4095,'Note 1','06/12/94')
3> insert titles values ('2', 'The', 'business', '1389', $19.99, $5000.00, 10, 4095,'Note 2','06/12/91')
4> insert titles values ('3', 'Emotional', 'psychology', '0736', $7.99, $4000.00, 10, 3336,'Note 3','06/12/91')
5> insert titles values ('4', 'Prolonged', 'psychology', '0736', $19.99, $2000.00, 10, 4072,'Note 4','06/12/91')
6> insert titles values ('5', 'With', 'business', '1389', $11.95, $5000.00, 10, 3876,'Note 5','06/09/91')
7> insert titles values ('6', 'Valley', 'mod_cook', '0877', $19.99, $0.00, 12, 2032,'Note 6','06/09/91')
8> insert titles values ('7', 'Any?', 'trad_cook', '0877', $14.99, $8000.00, 10, 4095,'Note 7','06/12/91')
9> insert titles values ('8', 'Fifty', 'trad_cook', '0877', $11.95, $4000.00, 14, 1509,'Note 8','06/12/91')
10> GO
3> CREATE FUNCTION AveragePrice(@booktype varchar(12))
4> RETURNS money
5> AS
6> BEGIN
7> DECLARE @avg money
8> SELECT @avg = avg(price)
9> FROM titles
10> WHERE type = @booktype
11>
12> RETURN @avg
13> END
14> GO
1>
2> SELECT title_id, price
3> FROM titles
4> WHERE price > dbo.AveragePrice('business')
5> AND type = 'business'
6> GO
title_id price
-------------------- ---------------------
2 19.9900
1>
2> DECLARE @avg money
3> EXEC @avg = dbo.AveragePrice 'business'
4> SELECT @avg
5> GO
---------------------
15.9700
1>
2>
3> drop FUNCTION AveragePrice;
4> GO
1>
2> drop table titles;
3> GO
1>
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