Cross Join with itself : Cross Join « Table Join « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table Join » Cross Join 
4. 2. 2. Cross Join with itself
4>
5CREATE TABLE Candidates(
6> candname varchar(10NOT NULL,
7> gender   char(1)     NOT NULL CONSTRAINT CHK_gender CHECK (gender IN('F''M'))
8)
9INSERT INTO Candidates VALUES('A''M')
10INSERT INTO Candidates VALUES('B''M')
11INSERT INTO Candidates VALUES('C''F')
12INSERT INTO Candidates VALUES('D''F')
13>
14SELECT
15>   T1.candname,
16>   T2.candname
17FROM
18>     Candidates AS T1
19>   CROSS JOIN
20>     Candidates AS T2
21> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)
candname   candname
---------- ----------
A          A
B          A
C          A
D          A
A          B
B          B
C          B
D          B
A          C
B          C
C          C
D          C
A          D
B          D
C          D
D          D

(16 rows affected)
1>
2> drop table candidates
3> GO
4. 2. Cross Join
4. 2. 1. SQL-92 Cross Join Syntax
4. 2. 2. Cross Join with itself
4. 2. 3. Matching Couples Using a Cross Join; Couples with Different Genders
4. 2. 4. it is the Cartesian product of all the rows from all tables participating in the SELECT statement
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