Using the CASE Expression with Complex Conditions : Case « Query « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Query » Case 
1. 23. 8. Using the CASE Expression with Complex Conditions
5>
6CREATE TABLE titles(
7>    title_id       varchar(20),
8>    title          varchar(80)       NOT NULL,
9>    type           char(12)          NOT NULL,
10>    pub_id         char(4)               NULL,
11>    price          money                 NULL,
12>    advance        money                 NULL,
13>    royalty        int                   NULL,
14>    ytd_sales      int                   NULL,
15>    notes          varchar(200)          NULL,
16>    pubdate        datetime          NOT NULL
17)
18> 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>
2>     SELECT
3>     title_id, price, ytd_sales,
4>     "DiscountPrice" =
5>                 CASE
6>                      WHEN ytd_sales < 1000 THEN
7>                                      CONVERT (SMALLMONEY, price * .50)
8>                      WHEN ytd_sales < 3000 THEN
9>                                      CONVERT (SMALLMONEY, price * .85)
10>                      ELSE price
11>                 END
12>     FROM titles
13> GO
title_id             price                 ytd_sales   DiscountPrice
-------------------- --------------------- ----------- ---------------------
1                                  20.0000        4095               20.0000
2                                  19.9900        4095               19.9900
3                                   7.9900        3336                7.9900
4                                  19.9900        4072               19.9900
5                                  11.9500        3876               11.9500
6                                  19.9900        2032               16.9915
7                                  14.9900        4095               14.9900
8                                  11.9500        1509               10.1575

(rows affected)
1>
2> drop table titles;
3> GO
1>
2>
1. 23. Case
1. 23. 1. The syntax pattern for case
1. 23. 2. The syntax of the searched CASE function
1. 23. 3. A Simple CASE
1. 23. 4. CASE Expression
1. 23. 5. Automatic Code Generation for CASE Expressions
1. 23. 6. Summarizing Data Using the CASE Expression
1. 23. 7. Using a CASE expression to sum sales by weekday.
1. 23. 8. Using the CASE Expression with Complex Conditions
1. 23. 9. Summarizing Data Using the Searched CASE Expression
1. 23. 10. A SELECT statement that uses a simple CASE function
1. 23. 11. A SELECT statement that uses a searchable CASE function
1. 23. 12. Searched CASE expression looks for the first expression that evaluates to true.
1. 23. 13. Update statement based on case condition
1. 23. 14. Case when else
1. 23. 15. Alias for case statement
1. 23. 16. Use two case statements in one select statement
1. 23. 17. Case then with query
1. 23. 18. Case with range
1. 23. 19. Doing a calculation in a Searched CASE
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