Can unique keys be null?

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How to run sql statements through the web interface?

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what is a database? : Sql dba

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Are null values same as that of zero or a blank space?

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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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What is nested table in pl sql?

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Find out the 3rd highest salary?

51 Answers   BirlaSoft, DAC, Silvia Infotech, Sutra Infotech,

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How many types of normalization are there?

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What is the maximum database size for sql express?

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What is the differnce between view and materialized view

4 Answers   TCS,

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How do I copy a table in sql?

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What is the purpose of a sql?

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