Unique + not null Constraint | Unique + not null | Constraint | Sql server tutorial
1.Primary key Constraint:-
• Constraints in sql | Primary Key constraint
2.Not Null Constraint:-
• Not Null Constraint | Not Null | Constrain...
3. Null Constraint :-
• Null Constraint | sql Null Constraint | C...
4.Unique key constraint :-
• unique key constraint | constraint | sql ...
1. unique+not null will not accept duplicate values
2. unique+not null will not accept null values
3. we can add unique+not null constraint for more than 1 column in a table
4. unique +not null Constraint will have constraint name
Syntax :-
create table tableName(colName datatype unique not null,colName datatype)
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