Summarizing Data Using the Searched CASE Expression : Case « Query « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Query » Case 
1. 23. 9. Summarizing Data Using the Searched CASE Expression
6>
7CREATE TABLE stores(
8>    stor_id        char(4)           NOT NULL,
9>    stor_name      varchar(40)           NULL,
10>    stor_address   varchar(40)           NULL,
11>    city           varchar(20)           NULL,
12>    state          char(2)               NULL,
13>    zip            char(5)               NULL
14)
15> GO
1insert stores values('1','B','56Ave.','Tustin',   'CA','92789')
2insert stores values('2','N','57St.', 'Los Gatos','CA','96745')
3insert stores values('3','T','67St.', 'Portland', 'OR','89076')
4insert stores values('4','F','89  St.', 'Fremont',  'CA','90019')
5> GO

(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 DISTINCT st.stor_name,
3>     'Sales Rating' =
4>         CASE
5>           WHEN (SELECT SUM(sa.qtyFROM sales sa
6>                                    WHERE st.stor_id = sa.stor_id10
7>               THEN 'Poor'
8>           WHEN (SELECT SUM(sa.qtyFROM sales sa
9>                                    WHERE st.stor_id = sa.stor_id80
10>               THEN 'Average'
11>           WHEN (SELECT SUM(sa.qtyFROM sales sa
12>                                    WHERE st.stor_id = sa.stor_id100
13>               THEN 'Good'
14>           ELSE 'Excellent'
15>         END,
16>     'Sales Total' = (SELECT SUM(sa.qtyFROM sales sa
17>                                         WHERE st.stor_id = sa.stor_id)
18>     FROM stores st, sales sa
19>     ORDER BY 'Sales Total'
20> GO
stor_name                                Sales Rating Sales Total
---------------------------------------- ------------ -----------
N                                        Average               10
T                                        Average               20
F                                        Average               25
B                                        Average               75

(rows affected)
1> drop table stores;
2> drop table sales;
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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