Difference Between Union And Union All?
Answers (1)
Add Answer1. 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