What is SQL CROSS JOIN

The SQL CROSS JOIN is the join which results out all the possible combination of the rows of two tables. It means the number of rows in the first table multiplies by the number of rows in the second table. You can call this product as the cartesian product of the rows of both the tables.

SQL CROSS JOIN Image

All the rows of the first table combine with all the rows of the second table. If there are more rows in both the tables, the Cross join results out a large table.

How to Use SQL CROSS JOIN

Now, if you want to know how to use full outer join in SQL, you have to use the two tables and also the syntax given below. From these two tables, you have to make all the possible combinations for rows of these tables.

Syntax

The above syntax result out all the possibilities rows from both the tables.

Example of SQL RIGHT OUTER JOIN

Now, let us create the two tables for Purchaser and Seller as given below to understand the example of full outer join in SQL server.

Below are the examples that contains the statement and the output of the full outer join of the given tables.

SQL CROSS Join Example Using the Select Statement

There are two tables given below to show the join. The first table is Purchaser table and second is the Seller table.

The first table contains the list of sellers.

Table 1: Seller

Id Seller_Name Seller_Email
1001 Big Show big@gmail.com
1002 Gem gem@gmail.com
1003 Matt matt@gmail.com

The second table contains the list of the purchasers.

Table 2: Purchaser

Purchaser_ID Purchaser_Name Plot_No Service_Id
1 Sam 12 1001
2 Pill 13 1002
3 Don 14 1003
4 Brock 15 1004

Now, let’s combine these two tables using the example given below.

Example

Output

Service_Id Seller_Name Purchaser_Name Plot_No
1001 Big Show Sam 12
1001 Big Show Pill 13
1001 Big Show Don 14
1001 Big Show Brock 15
1002 Gem Sam 12
1002 Gem Pill 13
1002 Gem Don 14
1002 Gem Brock 15
1003 Matt Sam 12
1003 Matt Pill 13
1003 Matt Don 14
1003 Matt Brock 15

You must also read.

Reference
Cross Join Doc

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