The UNION operator is used to combine the results of two or more SELECT statements and return the value without any duplicate values. To use this operator in the SELECT Statements, the SELECT should have –
- Every SELECT statement should have an equal number of columns.
- The data type should be the same for each column.
- The columns of each SELECT statement should have the same order.
- Syntax of UNION Operator –
SELECT column1,column2,column3,...,columnN
FROM Table A
UNION
SELECT column1,column2,column3,...,columnN
FROM Table B;
- Syntax of UNION ALL –
The UNION ALL is similar to UNION, but the only difference is that UNION ALL returns duplicate values.
SELECT column1,column2,column3,...,columnN
FROM Table A
UNION ALL
SELECT column1,column2,column3,...,columnN
FROM Table B;
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