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To combine two or more SELECT statements to form a single result table, use the set operators: UNION, EXCEPT or INTERSECT.
There is a major difference between JOIN and UNION in SQL. Using the JOIN clause, we combine the attributes of two given relations and, as a result, form tuples. Whereas we use the UNION clause when we want to combine the results obtained from two queries. They both combine data differently.
The UNION operator is used to combine the result-set of two or more SELECT statements. Every SELECT statement within UNION must have the same number of columns. The columns must also have similar data types. The columns in every SELECT statement must also be in the same order.
What is UNION ALL? UNION ALL is an extension of UNION in SQL. As the result set of UNION of two tables doesnt contains all the records from both the table, so UNION ALL comes into the picture that returns all the records from both the table (including duplicate rows also).
The UNION operator is used to combine the data from the result of two or more SELECT command queries into a single distinct result set. This operator removes any duplicates present in the results being combined.
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To run a query with multiple statements, ensure that each statement is separated by a semicolon; then set the DSQECRUNMQ global variable to 1 and run the query. When the variable is set to zero, all statements after the first semicolon are ignored.
We can use the UNION ALL operator if we want duplicates to be present in the combination of two or more SELECT statements. This SQL operator follows the same rules as the UNION operator, except for the use of the UNION ALL keyword instead of the UNION keyword in the syntax.
UNION, EXCEPT, and INTERSECT are operators that operate similarly and are used between two queries to form Boolean combinations between the results of the two queries. Given queries A and B, UNION returns all records returned by either A or B. EXCEPT returns all records in A but not in B.

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