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Oracle: Union All

Profile picture for user akshita.goel
Written by akshita.goel on 10/19/2021 - 13:51

UNION ALL Operator in SQL is similar to the UNION Operator. It helps to return all the records present in the Sets between which this operator applies. The only difference Between UNION and UNION ALL Operator occurs only when it comes to duplicate values.

UNION wherein does not support returning of the duplicate value multiple times. UNION ALL returns values even though they repeat.

For example:

a = {1,2,3,4,5,6,7}

b = {2,3,7,8,9}

a UNION b = {1,2,3,4,5,6,7,8,9} i.e. the multiple values are not repeated here.

However, a UNION ALL b = {1,2,2,3,3,4,5,6,7,7,8,9} i.e. the value returned even though they are repeated.

Syntax

Select Name from Stu
UNION ALL
Select Name from Children;

Example - SQL

We have the following Stu and Children table as shown below:

Stu table

Children

Now, we want to check all the total entries of name from both the table STu and Children:

Select Name from Stu
UNION ALL
Select Name from Children;

Output

Union All

Here, you can observe that duplicate names are present in the list.

Related Content
Oracle Tutorial
Oracle: UNION operator
Oracle: INTERSECT Operator
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