# Sum

Checks the sum of all the values in a column against a given expression.

**Syntax**

`Sum`

`<COL_NAME>`

`<EXPRESSION>`

**COL_NAME**– The name of the column that you want to evaluate the data quality rule against.**Supported column types**: Byte, Decimal, Double, Float, Integer, Long, Short**EXPRESSION**– An expression to run against the rule type response in order to produce a Boolean value. For more information, see Expressions.

**Example: Sum**

The following example rule checks whether the sum of all of the values in a column exceeds a given threshold.

`Sum "transaction_total" > 500000 Sum "Salary" < 55600 where "Customer_ID < 10"`

**Sample dynamic rules**

`Sum "ColA" > avg(last(10))`

`Sum "colA" between min(last(10)) - 1 and max(last(10)) + 1`

**Null behavior**

The `Sum`

rule will ignore rows with `NULL`

values in the calculation of sum. For example:

`+---+-----------+ |id |units | +---+-----------+ |100|0 | |101|null | |102|20 | |103|null | |104|40 | +---+-----------+`

The sum of column `units`

will not consider rows 101 and 103 and result to (0 + 20 + 40) = 60.