A NOT NULL phrase adds a constraint to restrict the input of rows with a null value. : Constriant violation « Constraints « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Constraints » Constriant violation 
7. 12. 3. A NOT NULL phrase adds a constraint to restrict the input of rows with a null value.
5>
6CREATE TABLE T (
7>     int1 int IDENTITY PRIMARY KEY,
8>     vch1 varchar(5)
9>         CHECK (LEN(vch10)
10>          NOT NULL,
11>      vch2 varchar(5)
12>          CONSTRAINT CK_LEN_TOO_SHORT
13>          CHECK (LEN(vch20)
14>          NOT NULL
15>  )
16>  GO
1>
2INSERT (vch1VALUES('40222')
3INSERT (vch1VALUES('4022')
4INSERT (vch1VALUES('r0222')
5INSERT T DEFAULT VALUES
6> GO
Msg 515, Level 16, State 2, Server J\SQLEXPRESS, Line 2
Cannot insert the value NULL into column 'vch2', table 'master.dbo.T'; column does not allow nulls. INSERT fails.
The statement has been terminated.
Msg 515, Level 16, State 2, Server J\SQLEXPRESS, Line 3
Cannot insert the value NULL into column 'vch2', table 'master.dbo.T'; column does not allow nulls. INSERT fails.
The statement has been terminated.
Msg 515, Level 16, State 2, Server J\SQLEXPRESS, Line 4
Cannot insert the value NULL into column 'vch2', table 'master.dbo.T'; column does not allow nulls. INSERT fails.
The statement has been terminated.
Msg 515, Level 16, State 2, Server J\SQLEXPRESS, Line 5
Cannot insert the value NULL into column 'vch1', table 'master.dbo.T'; column does not allow nulls. INSERT fails.
The statement has been terminated.
1>
2>
3> drop table t;
4> GO
1>
7. 12. Constriant violation
7. 12. 1. Trap Both Primary Key and CHECK Constraint Violations
7. 12. 2. Exception in a transaction
7. 12. 3. A NOT NULL phrase adds a constraint to restrict the input of rows with a null value.
7. 12. 4. Update statement and check-constraints
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