Does group by remove duplicates?
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write sub query for eliminating duplicate rows using analytical function?
Name Salary Abc 50000 Abc 50000 xyz 20000 find the max salary using aggregate function?
what is the different between unique+not null & primary key,
What is scalar and vector?
What are indexes, and what are the different types?
Is pl sql a programming language?
What is a unique constraint?
What is a transaction?
What is %type in pl sql?
Which one is better sql or oracle?
what is indexing, searching and user interface?
<<labele>> declare a=10 b=20, begin some statements declare a=30 c=40 end; what is the A value in nested block?
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