NULL is a value that is unavailable, unassigned, unknown or inapplicable. If a column in a row has no value, then the column we can said null value.
Arithmetic Operation With NULL : All types of arithmetic operation with null value result will be null.
Count function with NULL : Count (EXP) function return the result only for not null value. COUNT(*) return the result with null and not null values.
Arithmetic Operation With NULL : All types of arithmetic operation with null value result will be null.
Count function with NULL : Count (EXP) function return the result only for not null value. COUNT(*) return the result with null and not null values.
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