Subqueries are SELECT statements that are nested within another T-SQL statement. : Subquery « Subquery « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Subquery » Subquery 
8.1.4.Subqueries are SELECT statements that are nested within another T-SQL statement.
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>
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>
8> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2>      SELECT    title, price
3>      FROM      titles
4>      WHERE     title_id IN
5>                (SELECT   title_id
6>                FROM      sales
7>                WHERE     qty > 30)
8> GO
title                                                                            price
-------------------------------------------------------------------------------- ---------------------
Secrets                                                                                        20.0000

(rows affected)
1>
2> drop table sales;
3> drop table titles;
4> GO
1>
8.1.Subquery
8.1.1.Building a Nested Subquery
8.1.2.Using Subqueries to Check for the Existence of Matches
8.1.3.Using Subqueries to Check for the Existence of Matches between two tables
8.1.4.Subqueries are SELECT statements that are nested within another T-SQL statement.
8.1.5.Subqueries and Comparison Operators: =
8.1.6.A subquery can be used with other comparison operators: <
8.1.7.Subqueries and IN Operator
8.1.8.A query that uses three subqueries
8.1.9.Doing calculation with subquery
8.1.10.Subqueries can be nested.
8.1.11.ID NOT IN (SELECT ID FROM Title)
8.1.12.Delete with subquery
8.1.13.Join and sub query
8.1.14.Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
8.1.15.subquery with >=
8.1.16.<> ALL with subquery
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