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PQL47 (PQL Function Library - CPM 4.7)

VAR

Applies to: CELONIS 4.0 CELONIS 4.2 CELONIS 4.3 CELONIS 4.4 CELONIS 4.5 CELONIS 4.6 CELONIS 4.7

Description

VAR calculates the variance per group. Variance can be applied to INT or FLOAT columns.

Syntax
VAR ( table.column )
NULL handling

NULL values are ignored, meaning that they do not influence the result. If all values of a group are NULL, the result for this group is also NULL.

Examples

[1] Variance of column.

Query

Column1

VAR ( "Table"."Column" )

Input

Output

Table

Column : INT

1

2

3

Result

Column1 : FLOAT

1.0

[2] Get the variance by country.

Query

Column1

"Table"."Country"

Column2

VAR ( "Table"."Values" )

Input

Output

Table

Country : STRING

Values : INT

'US'

1

'DE'

4

'DE'

4

'FR'

5

'US'

2

'US'

3

Result

Column1 : STRING

Column2 : FLOAT

'DE'

0.0

'FR'

0.0

'US'

1.0

[3] Get the variance with nulls, grouped by country.

Query

Column1

"Table"."Country"

Column2

VAR ( "Table"."Values" )

Input

Output

Table

Country : STRING

Values : INT

'FR'

10

'FR'

null

'DE'

null

Result

Column1 : STRING

Column1 : STRING

'DE'

null

'FR'

0.0

See also: