What is a unique constraint?


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More SQL PLSQL Interview Questions

In packages the source code is compiled into p code ? how do we describe the p code

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Can we write dml inside a function in sql server?

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What is cte?

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Why commit is not used in triggers?

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What are sql built in functions?

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Is json a nosql?

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What is assignment operator in pl sql?

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Is it important to partition hard disk?

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I have the table like this S.No Name ID 01 Xyz 123 I want the result as 01Xyz123 How to write the query to retrieve the entire row data in a single column?

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Explain the insert into statements in sql?

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how to sort records in sql?

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Do foreign keys improve performance?

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