Using a CASE expression to sum sales by weekday. : Case « Query « SQL Server / T-SQL Tutorial

1. SQL Server / T-SQL Tutorial
2. Query
3. Case

4>
5>
6> CREATE TABLE sales(
7>    stor_id        char(4)           NOT NULL,
8>    ord_num        varchar(20)       NOT NULL,
9>    ord_date       datetime          NOT NULL,
10>    qty            smallint          NOT NULL,
11>    payterms       varchar(12)       NOT NULL,
12>    title_id       varchar(80)
13> )
14> GO
1> insert sales values('1', 'QA7442.3', '09/13/94', 75, 'ON Billing','1')
2> insert sales values('2', 'D4482',    '09/14/94', 10, 'Net 60',    '1')
3> insert sales values('3', 'N914008',  '09/14/94', 20, 'Net 30',    '2')
4> insert sales values('4', 'N914014',  '09/14/94', 25, 'Net 30',    '3')
5> insert sales values('5', '423LL922', '09/14/94', 15, 'ON Billing','3')
6> insert sales values('6', '423LL930', '09/14/94', 10, 'ON Billing','2')
7> GO

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)
1>
2>
3>     SELECT  sum(qty) AS Total,
4>             CASE datepart(weekday, ord_date)
5>                    WHEN 1 THEN 'Sunday'
6>                    WHEN 2 THEN 'Monday'
7>                    WHEN 3 THEN 'Tuesday'
8>                    WHEN 4 THEN 'Wednesday'
9>                    WHEN 5 THEN 'Thursday'
10>                    WHEN 6 THEN 'Friday'
11>                    WHEN 7 THEN 'Saturday'
12>             END AS Weekday
13>     FROM sales
14>     GROUP BY datepart(weekday, ord_date)
15> GO
Total       Weekday
----------- ---------
         75 Tuesday
         80 Wednesday

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