What is a constraint?


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Is there a way to automate sql execution from the command-line, batch job or shell script?

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Types of joins ?

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Why use truncate instead of delete?

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what is the difference between varray and table data type..please expalain with some examples... under what situation you will go for varray..instead of index by table...

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What kind of join is join?

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What is pl sql quora?

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When we can declare a column as Unique and Not Null both at the same time. What is the use pf Primary Key then?

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what is the difference between char and varchar data types? : Sql dba

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Why do we need cursor in pl sql?

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Why left join is used in sql?

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