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SQL SERVER||ISNULL() Vs IS NULL

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ISNULL() and IS NULL
ISNULL()
Function
Returns alternate value when an expression is NULL
IS NULL
Not Function, it's Operator
it extracts how many NULL values exist in column
ISNULL()
Function
Returns alternate value when an expression is NULL
IS NULL
Not Function, it's Operator
it extracts how many NULL values exist in column