What is the difference between null value, zero, and blank space?

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I need a exceptoin in pl/sql block so that if any errors occur in the block then no exception should errors should raise?

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Fetch an entire row from the employees table for a specific employee ID:

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How can I create a table from another table without copying any values from the old table?

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explain access control lists. : Sql dba

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What is the example of procedure?

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Is primary key is clustered index?

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how do you know if your mysql server is alive? : Sql dba

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What are primary key and foreign key and how they work?

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What view means?

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What are the sql commands?

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how to insert values like 10:10:00,30:25:00 etc.into table after insert how can i sum the above insert values to get the result as 40:35:00

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