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SUM Function
SUM is an aggregate function that returns the sum of a set of numbers.
SUM ([ALL | DISTINCT] expression)
ALL | DISTINCT
specifies whether duplicate values are included in the computation of the SUM of the
expression. The default option is ALL, which causes duplicate values to be included. If
you specify DISTINCT, duplicate values are eliminated before the SUM function is applied.
expression
specifies a numeric or interval value expression that determines the values to sum. The
expression cannot contain an aggregate function or a subquery. The DISTINCT clause
specifies that the SUM function operates on distinct values from the one-column table derived
from the evaluation of expression. All nulls are eliminated before the function is applied
to the set of values. If the result table is empty, SUM returns NULL.
See
"Expressions" (page
Considerations for SUM
Data Type and Scale of the Result
The data type of the result depends on the data type of the argument. If the argument is an exact
numeric type, the result is LARGEINT. If the argument is an approximate numeric type, the
result is DOUBLE PRECISION. If the argument is INTERVAL data type, the result is INTERVAL
with the same precision as the argument. The scale of the result is the same as the scale of the
argument. If the argument has no scale, the result is truncated.
Operands of the Expression
The expression includes columns from the rows of the SELECT result table—but cannot include
an aggregate function. The valid expressions are:
SUM (SALARY)
SUM (SALARY * 1.1)
SUM (PARTCOST * QTY_ORDERED)
Example of SUM
•
Compute the total value of parts in the current inventory:
SELECT SUM (price * qty_available)
FROM sales.parts;
(EXPR)
---------------------
--- 1 row(s) selected.
255).
117683505.96
SUM Function
473
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