Set Operators in SQL Server | Types Of Set operators | Working with Set Operators in SQL Server
#SetOperatorsInSQLServer #TypesOfSetOperators #MSSQLTutorials
#SETOperators
SQL supports few Set operations which can be performed on the table data.
Set operators in SQL Server are used to combine the output of multiple queries.
When ever we want to combine the output of multiple Select statements we have to identify three factors.
1. Whether the multiple Select statements contains equal number of columns or not?
2. If Select statement columns are equal again we must identify whether selected columns data types are equal or not?
3. We should identify whether the Result column name coming from first Select statement or not?
#TypesOfSetOperators:
#UNIONALL
#UNION
#INTERSECT
#EXCEPT
#UNIONALL:
It combines the multiple select statements into single result set and it including duplicate values.
#Syntax:
SELECT COLUMN1, COLUMN2… FROM TABLE1
WHERE CONDITION
GROUP BY (Non Aggregated Columns)
HAVING Condition
UNION ALL / UNION / INTERSECT / Except
SELECT COLUMN1, COLUMN2… FROM TABLE2
WHERE CONDITION
GROUP BY (Non Aggregated Columns)
HAVING Condition
#UNION :
It combines the multiple select statements into single result set and it not including duplicate values.
i.e It combine Unique information from multiple select statements
#INTERSECT:
It Read the common values from given set of select statements.
#EXCEPT:
It combines results of two SELECT statements and return only those in the final result,
which belongs to the first set of the result.
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