How many types of primary keys are there?
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what is the difference between granting and creating a view?
What is a recursive join sql?
What is the left table in sql?
What pl/sql package consists of?
Which nosql database is best?
What is cross join sql?
What is the purpose of using pl/sql?
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What is the main difference between a UNION statement and a UNION ALL statement? 1. A UNION statement eliminates duplicate rows; a UNION ALL statement includes duplicate rows. 2. A UNION statement can be used to combine any number of queries; a UNION ALL statement can be used to combine a maximum of two queries. 3. A UNION statement can only combine queries that have parallel fields in the SELECT list; a UNION ALL statement can combine queries with differing SELECT list structures. 4. A UNION statement cannot be used with aggregate functions; a UNION ALL statement can be used with aggregate functions. 5. There is no difference between the two statements; they are interchangeable.
scope of exception handling in plsql
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