Why do we use triggers?

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How do you remove duplicate records from a table?

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Is primary key always clustered index?

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What are basic techniques of indexing?

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What is an implicit commit?

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How does postgresql compare to oracle/db2/ms sql server/informix?

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Can we use having without group by in sql?

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Can %notfound return null after a fetch?

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how to write date and time literals? : Sql dba

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What is a constraint? Tell me about its various levels.

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What is difference between sql and mysql?

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how i do the database testing of online money transactions between two parties (client and organization). suppose our company makes a website for our client and give a extra feature of online money transaction with there clients then how i test this feature in database testing

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