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Give syntax for SQL and ORACLE joins.
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Why we choose emp number as primarykey?
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select trunc(round(156.00,-1),-1) from dual;
What are joins, explain all types of joins?
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We need to compare two successive records of a table based on a field. For example, if the table is CUSTOMER, and the filed is Account_ID, To compare Account_IDs of record1 and record2 of CUSTOMER table, what can be the query ?
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what are actual and formal parameters?
How do we know whether an index is created on a table ???
What are the Referential actions supported by FOREIGN KEY integrity constraint ?
What is meant by an index?
I just want to maintain data like an employee can belongs to 3 or more departments . We can resolve this by using composite key but it avoids normalization rules. So Can anyone tell me how can I maintain data.
Oracle General 
