disallow NULL values in a table.

disallow NULL values in a table.

How do I disallow NULL values in a table?

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November 15, 2010 at 4:07 PM

Hi friends,

It is a constraints, so It is called column integrity constraints, most of the time it is aplied at table creation time. Most databases allow a default value for the column as well. The following SQL statement displays the NOT NULL constraint: CREATE TABLE book( Id VARCHAR(25) NOT NULL, nameINTEGER NOT NULL, Price NUMERIC(5, 2) NOT NULL );

Note: Note that some databases won't allow the constraint to be applied after table creation.

Thanks.


November 15, 2010 at 4:09 PM

Hi friends,

It is a constraints, so It is called column integrity constraints, most of the time it is aplied at table creation time. Most databases allow a default value for the column as well. The following SQL statement displays the NOT NULL constraint:

CREATE TABLE book( Id INTEGER NOT NULL, name VARCHAR(25) NOT NULL, Price NUMERIC(5, 2) NOT NULL );

Note: Note that some databases won't allow the constraint to be applied after table creation.

Thanks.









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