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Are full outer join and Cross join are same? ( SQL Server interview questions with answers)

• By Shiv Prasad Koirala in SQL
• Oct 19th, 2013
• 15599
• 0

No, they are not. Full outer join returns common records in both the tables + uncommon records for left table + uncommon records from right table. Where as in Cross Join we will get Cartesian product, that means every record of left table will be combined with every row in right table and result was returned back.

 Example:

Table 1 Column 1 Column2 A X B Y C Z D W

Table 2 Column2 Column3 X XName Y YName P PName O OName

Full Outer Join
Select * from Tabl1 inner join Tabl1 Full outer join Tabl2 on Table1.X Full outer join Table2.

Column 1	Column2	Column2	Column3
A	X	X	XName
B	Y	Y	YName
C	Z	NULL	NULL
D	W	NULL	NULL
NULL	NULL	P	PName
NULL	NULL	O	OName

 

 

Cross join
Select * from Table1, Table2

Column 1	Column2	Column2	Column3
A	X	X	XName
A	X	Y	YName
A	X	P	PName
A	X	O	OName
B	Y	X	XName
B	Y	Y	YName
B	Y	P	PName
B	Y	O	OName
C	Z	X	XName
C	Z	Y	YName
C	Z	P	PName
C	Z	O	OName
D	W	X	XName
D	W	Y	YName
D	W	P	PName
D	W	O	OName

Explanation to Inner Join , Left Join and Right Join.

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