Difference between UNION and UNION ALL:

UNION UNION ALL
The UNION set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains unique values. The UNION ALL set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains duplicate values.
Syntax: QUERY UNION QUERY; Syntax: QUERY UNION ALL QUERY;

Example for UNION:

Consider two tables,

The table “T1(ID, fruit_name)” contains rows with values (1, 'Mango' ), (1, 'Orange' ), (3, 'Grapes' ).

The table “T2(ID, fruit_name)” contains rows with values (1, 'Mango' ), (1, 'Apple' ), (3, 'Grapes' )...

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Chapter 8, Problem 9RQ

Chapter 8, Problem 11RQ

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Chapter 8 Solutions

Database Systems: Design, Implementation, & Management

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UNION	UNION ALL
The UNION set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains unique values.	The UNION ALL set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains duplicate values.
Syntax: QUERY UNION QUERY;	Syntax: QUERY UNION ALL QUERY;

Solution Summary: The author explains the difference between UNION and UNIONS ALL. The set operator is used to combine the output of two or more queries and produce a result.

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