Call user-defined function in where clause : function « Procedure Function « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Procedure Function » function 
21. 2. 7. Call user-defined function in where clause
4CREATE 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>
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

3CREATE FUNCTION AveragePrice(@booktype varchar(12))
4> RETURNS money
5> AS
6BEGIN
7>     DECLARE @avg money
8>     SELECT @avg = avg(price)
9>     FROM titles
10>     WHERE type = @booktype
11>
12>     RETURN @avg
13END
14> GO
1>
2SELECT title_id, price
3FROM titles
4WHERE 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'
4SELECT @avg
5> GO

---------------------
              15.9700
1>
2>
3> drop FUNCTION AveragePrice;
4> GO
1>
2> drop table titles;
3> GO
1>
21. 2. function
21. 2. 1. The syntax for creating a multi-statement table-valued function
21. 2. 2. The syntax for creating a scalar-valued function
21. 2. 3. The syntax for creating a simple table-valued function
21. 2. 4. The syntax of the ALTER FUNCTION statement for a scalar valued function
21. 2. 5. The syntax for altering a simple table-valued function
21. 2. 6. The syntax for altering a multi-statement table-valued function
21. 2. 7. Call user-defined function in where clause
21. 2. 8. Call two user-defined functions in a select statement
21. 2. 9. Function WITH SCHEMABINDING
21. 2. 10. Multistatement Table-Valued Functions
21. 2. 11. Pass a declared variable to a function
21. 2. 12. Return TOP 100 PERCENT WITH TIES from a function
21. 2. 13. Get the 3 employees with the most RegionPlace
21. 2. 14. Use function as a view
21. 2. 15. Create a scalar-valued function that returns the total Billing amount due
21. 2. 16. Invoke the scalar-valued function
21. 2. 17. A SELECT statement that uses the function in a join operation
21. 2. 18. Use function to wrap a long sql statement
21. 2. 19. Query a table returned from a function
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