# DIFFERENCE

`DIFFERENCE(SUM([Hours Spent]))`

## Syntax

DIFFERENCE({aggregation method}(numerical expression))

A difference for the given expression is calculate by `{Current Value} - {Previous Value}`.

aggregation method: Any aggregation function `SUM`, `MAX`, `COUNT` and etc applied to numeric expression.

numerical expression: Basic arithmetic calculation created using the math operators `+, -, *, /`, numerical data fields and constants.

For example we have the data set below after applying aggregation `COUNT([ID])` to income record set

#`COUNT([ID])`
15
235
325

Applying `DIFFERENCE(COUNT([ID]))` will give the table below

#`DIFFERENCE(COUNT([ID]))`
10
235 - 5 = 30
325 - 35 = -10

## Spent Time Difference By Date

Shows the difference for tasks spent time over date

#### Source: `Tasks`

Time tracking stats for tasks of the building super hero suit

03 Jan 2018 10:13 AMCreate a steel helmet to protect head19Protective Suit
20 Jan 2018 04:08 PMCreate a chest protection from steel45Protective Suit
05 Feb 2018 11:34 AMAsk agency to create fancy identity for new super hero30Design
09 Feb 2018 02:11 PMInstall super hero logo on body and helmet2Protective Suit
09 Feb 2018 02:11 PMPut on gloves with nice color2Protective Suit
12 Feb 2018 09:01 PMAsk Hulk to push in head5Combat Testing
01 Mar 2018 06:45 PMAsk Hulk to push in chest5Combat Testing

### Chart `BAR`

#### Y: `DIFFERENCE(SUM([Hours Spent]))`

DAY(Completed On)DIFFERENCE(SUM(Hours Spent))
3 Jan 20180
20 Jan 201826
5 Feb 2018-15
9 Feb 2018-26
12 Feb 20181
1 Mar 20180