What is not null constraint?
Answer / Hrishikesh Kumar
A Not Null Constraint in SQL Server ensures that a column cannot accept NULL values. It enforces data integrity by preventing the insertion or updating of NULL values into a specified column.
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i have account table which consists of account name,card no and card no consists 16 digits now i want to retrieve the data if card no starts from 4 then it should print visa and if it starts from 5 then it should print master so plse help me to write simple query with out store procs .
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