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The NULL keyword is used in SQL operations. It
can be used when creating a column to indicate that the column can hold null
values. Here is an example:
CREATE TABLE Contractors(FirstName TEXT NULL);
To negate the NULL keyword in this case, precede it with
NOT to get NOT NULL. Here is an example that creates a columns and specifies
that the column cannot hold null values:
CREATE TABLE Contractors(FirstName TEXT NULL,
LastName VARCHAR NOT NULL);
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