TAILIEUCHUNG - Using SET Operators

After completing this lesson, you should be able to do the following: Describe SET operators Use a SET operator to combine multiple queries into a single query Control the order of rows returned | Using SET Operators Schedule: Timing Topic 30 minutes Lecture 20 minutes Practice 50 minutes Total Objectives After completing this lesson, you should be able to do the following: Describe SET operators Use a SET operator to combine multiple queries into a single query Control the order of rows returned Lesson Aim In this lesson, you learn how to write queries by using SET operators. The SET Operators A B UNION/UNION ALL A B A B INTERSECT A B MINUS The SET Operators The SET operators combine the results of two or more component queries into one result. Queries containing SET operators are called compound queries. All SET operators have equal precedence. If a SQL statement contains multiple SET operators, the Oracle server evaluates them from left (top) to right (bottom) if no parentheses explicitly specify another order. You should use parentheses to specify the order of evaluation explicitly in queries that use the INTERSECT operator with other SET operators. Note: In the slide, the

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