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find the employee whose salaries greater than their respective dept. avarage salary ?
what is the size of null value?
what is composite primary key?
what is candidte key in sql?
how to display last 2 rows from a table ?
write a query show the no. of employee details who earn more than their manager salaries ?
what is difference between delete and truncate?
HOW MANY COLUMNS CAN TABLE HAVE?
What is difference between varchar and varchar2 ?
What is RAID concept ?
what is a field in a database ?
What is ACID properties?
What is primary key?
What is difference between DBMS and RDBMS?
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