How to Implement the NOT NULL Function in the SQL Database
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admin Selected answer as best May 7, 2023
The NOT NULL constraint in SQL is used to ensure that a column does not contain null values. This constraint can be applied to a column when it is created or added to an existing table using an ALTER TABLE statement.
Here’s an example of how to create a table with a NOT NULL constraint on a column:
CREATE TABLE table_name ( Â Â Â Â column1 datatype NOT NULL, Â Â Â Â column2 datatype, Â Â Â Â column3 datatype );
In the above example, the first column (column1) is defined as NOT NULL, which means that it must contain a value in every row.
admin Selected answer as best May 7, 2023