How subquery works in sql?

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Can we perform dml on view?

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What are triggers in sql?

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What is exit statement?

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Does a primary key have to be a number?

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What is the limitation on the block size of pl/sql?

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What is extent clause in table space?

1 Answers   TCS,

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What is the difference between the implicit and explicit cursors?

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what are the differences between char and varchar? : Sql dba

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1. how to use the check option constraints in sql query..? 2.how to add data in a complex query ? 3.is it possible to use commit or rollback or savepoint in triggers...if not why please explain with examples...? 4.what is the difference between meterialized view and normal view..how to create materialized view and how to use it..? 5.what is varray...? what is the advantage of the varray ? please expalin with a simpel example..i want to load into a table (student no and name and his marks..) please give example.. 6.what are the bulk bind exceptions...how to use bulk bind and how to use bulk collect..please explain with example... 7.what is for update of and where current of ...? 8 what is the use of nowait ? 9.please give an example for nocopy in a simple plsql query 10.create an index in a table...tellme how to use the index in a where clause to do performance tunning...

3 Answers   Satyam,

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Why do we need databases?

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What is a composite primary key?

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