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SERIAL 

SERIAL is a number generator that generates positive integers starting with 1 or a specified value.

SERIAL can be used as a DEFAULT specification for columns (DEFAULT SERIAL) that can only contain fixed point numbers. The maximum value generated is (10**n)-1 if DEFAULT SERIAL is defined for a column of the data type FIXED (n).

SERIAL columns can only be assigned a value when a row is inserted. The values of a SERIAL column cannot be changed with an UPDATE statement. A SERIAL column, therefore, can be used to determine the insertion sequence and identify a row in a table uniquely.

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