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How can we avoid duplicating records in a query?
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Explain the concept of normalization.
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what is primary key? : Sql dba
I have a table with 1 million records out of which 10,000 records are of unique records, then if I will implement index, then which type of index shall I use and why shall I use?
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If we declare constraints Unique and Not null on a single column then it will act as a Primary key, so what is the use of primary key??
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