Deleting sales based on the average quantity of sales. : Delete « Insert Delete Update « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Insert Delete Update » Delete 
2. 4. 9. Deleting sales based on the average quantity of sales.
3>
4CREATE TABLE sales(
5>    stor_id        char(4)           NOT NULL,
6>    ord_num        varchar(20)       NOT NULL,
7>    ord_date       datetime          NOT NULL,
8>    qty            smallint          NOT NULL,
9>    payterms       varchar(12)       NOT NULL,
10>    title_id       varchar(80)
11)
12> 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>      DELETE    sales
3>      WHERE     qty <
4>                (SELECT AVG(qtyfrom sales)
5> GO

(rows affected)
1> drop table sales;
2> GO
1>
2. 4. Delete
2. 4. 1. The syntax of the DELETE statement
2. 4. 2. A DELETE statement with where clause
2. 4. 3. A DELETE statement that removes all the rows from the BillingCopy table
2. 4. 4. A DELETE statement that removes a single row from the BillingCopy table
2. 4. 5. Deleting sales for a publisher by name.
2. 4. 6. A DELETE statement with subquery
2. 4. 7. Delete with table join
2. 4. 8. A DELETE statement with NOT IN and subquery
2. 4. 9. Deleting sales based on the average quantity of sales.
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