A query that required a derived table. : Inline view « Subquery « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Subquery » Inline view 
8. 3. 4. A query that required a derived table.
6>      CREATE TABLE MyTempTable
7>      (
8>           ThisCol varchar(10)
9>      )
10>     GO
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>
3>     INSERT MyTempTable
4>           SELECT    Col1
5>           FROM      (SELECT DISTINCT Col1 = CONVERT(varchar(10), qty),
6>                             Col2 = qty
7>                     FROM    salesxyz
8>           ORDER BY  Col2
9>      GO

(rows affected)
1>
2>
3>
4>      SELECT FROM MyTempTable
5>     GO
ThisCol
----------
10
15
20
25
75

(rows affected)
1>
2>     drop table sales
3>      DROP TABLE MyTempTable
4>     GO
1>
8. 3. Inline view
8. 3. 1. Creating a Derived Table
8. 3. 2. Subqueries and Derived Tables
8. 3. 3. SELECT FROM (query that returns a regular result set) AS JOIN
8. 3. 4. A query that required a derived table.
8. 3. 5. In-Line Views (Derived Tables)
8. 3. 6. A query that uses a correlated subquery in its SELECT clause to retrieve the most recent Billing for each Banker
8. 3. 7. Queries in the FROM Clause
8. 3. 8. Select from nested select statements
8. 3. 9. Join with (inline)Table Expressions
8. 3. 10. Finding First Employee Using a Derived Table
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