Set Operators in SQL
In this post I will explain about Set Operators in SQL Server, although this part is quite short. So let’s start.
Set Operators in SQL
Set Operators in SQL: There are 4 types of set operators in SQL –
- Union – Distinct records in ascending order
- Union All – Includes Duplicate values
- Intersect – Common and distinct records in ascending order
- Except – Minus and distinct records in ascending order
When we want to retrieve the same information from all the tables, then we use the union. If we use union then it will return the distinct records and in this case no. of fields and order should be the same in all the tables and data type must be compatible.
2. UNION ALL
When we want to retrieve the same information from all the tables, then we use Union All. If we use union all then it will return all records and in this case no. of fields and order should be the same in all the tables and data type must be compatible.
The SQL INTERSECT set operator or clause is used to returns rows only from the first SELECT statement that is identical to a row in the second SELECT statement when combining two SELECT statements. INTERSECT returns the common rows only by using two SELECT statements. Just as with the UNION operator, the same rules apply when using the INTERSECT operator.
The SQL EXCEPT set operator or clause is used to returns rows from the first SELECT statement that is not returned by the second SELECT statement by combining two SELECT statements. EXCEPT returns the rows, which are not found in the second SELECT statement. Just like the UNION operator, the same rules apply when using the EXCEPT set operator.
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