Difference Between Union And Union All?

Forums SQLDifference Between Union And Union All?
Staff asked 2 years ago

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Staff answered 1 year ago

1. Union :

Union is the process of combining two or more data sets into one. Using select statements, SQL Server’s Union function combines two queries into a single result set. All of the rows that the query describes are extracted via union.

Syntax –
query1 UNION query2
2. Union All :

A union is used to extract data based on the query’s requirements, whereas Union All is used to retrieve every record from a group of two tables.

Syntax –
query1 UNION ALL query2

 

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