One interest thing in sql is creation of primary and unique keys....
the difference between primary Key and Unique key is , Primary create clustered index on the column where as unique key creat non-clustered index on the column.
One major difference is primary Key doesn't allow NULL values but Unique allows One NULL value.
How interest it is..............
SQL is my passion.............i preferred SQL than any other RDBMS
the difference between primary Key and Unique key is , Primary create clustered index on the column where as unique key creat non-clustered index on the column.
One major difference is primary Key doesn't allow NULL values but Unique allows One NULL value.
How interest it is..............
SQL is my passion.............i preferred SQL than any other RDBMS
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