Cartesian Product: cross join : Cross Join « Table Joins « SQL Server / T-SQL

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SQL Server / T-SQL » Table Joins » Cross Join 
Cartesian Product: cross join


1>
2CREATE TABLE employee  (emp_no    INTEGER NOT NULL,
3>                         emp_fname CHAR(20NOT NULL,
4>                         emp_lname CHAR(20NOT NULL,
5>                         dept_no   CHAR(4NULL)
6>
7insert into employee values(1,  'Matthew', 'Smith',    'd3')
8insert into employee values(2,  'Ann',     'Jones',    'd3')
9insert into employee values(3,  'John',    'Barrimore','d1')
10insert into employee values(4,  'James',   'James',    'd2')
11insert into employee values(5,  'Elsa',    'Bertoni',  'd2')
12insert into employee values(6,  'Elke',    'Hansel',   'd2')
13insert into employee values(7,  'Sybill',  'Moser',    'd1')
14>
15select from employee
16> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
emp_no      emp_fname            emp_lname            dept_no
----------- -------------------- -------------------- -------
          Matthew              Smith                d3
          Ann                  Jones                d3
          John                 Barrimore            d1
          James                James                d2
          Elsa                 Bertoni              d2
          Elke                 Hansel               d2
          Sybill               Moser                d1

(rows affected)
1>
2>
3CREATE TABLE department(dept_no   CHAR(4NOT NULL,
4>                         dept_name CHAR(25NOT NULL,
5>                         location  CHAR(30NULL)
6>
7insert into department values ('d1', 'developer',   'Dallas')
8insert into department values ('d2', 'tester',      'Seattle')
9insert into department values ('d3', 'marketing',  'Dallas')
10>
11select from department
12> GO

(rows affected)

(rows affected)

(rows affected)
dept_no dept_name                 location
------- ------------------------- ------------------------------
d1      developer                 Dallas
d2      tester                    Seattle
d3      marketing                 Dallas

(rows affected)
1>
2>
3> -- Cartesian Product
4>
5> -- ANSI join syntax:
6>
7SELECT FROM employee CROSS JOIN department
8> GO
emp_no      emp_fname            emp_lname            dept_no dept_no dept_name                 location
----------- -------------------- -------------------- ------- ------- ------------------------- ------------------
          Matthew              Smith                d3      d1      developer                 Dallas
          Ann                  Jones                d3      d1      developer                 Dallas
          John                 Barrimore            d1      d1      developer                 Dallas
          James                James                d2      d1      developer                 Dallas
          Elsa                 Bertoni              d2      d1      developer                 Dallas
          Elke                 Hansel               d2      d1      developer                 Dallas
          Sybill               Moser                d1      d1      developer                 Dallas
          Matthew              Smith                d3      d2      tester                    Seattle
          Ann                  Jones                d3      d2      tester                    Seattle
          John                 Barrimore            d1      d2      tester                    Seattle
          James                James                d2      d2      tester                    Seattle
          Elsa                 Bertoni              d2      d2      tester                    Seattle
          Elke                 Hansel               d2      d2      tester                    Seattle
          Sybill               Moser                d1      d2      tester                    Seattle
          Matthew              Smith                d3      d3      marketing                 Dallas
          Ann                  Jones                d3      d3      marketing                 Dallas
          John                 Barrimore            d1      d3      marketing                 Dallas
          James                James                d2      d3      marketing                 Dallas
          Elsa                 Bertoni              d2      d3      marketing                 Dallas
          Elke                 Hansel               d2      d3      marketing                 Dallas
          Sybill               Moser                d1      d3      marketing                 Dallas

(21 rows affected)
1>
2> drop table employee
3> drop table department
4> GO
1>
           
       
Related examples in the same category
1. Cross join tables
2. ANSI join syntax for cross join
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