Applies to:  CELONIS 4.0 CELONIS 4.2 CELONIS 4.3 CELONIS 4.4 

Description

Returns the first element of the specified column for each element of the given parent table. An order by expression can be set to define the order that should be used to determine the first element.

PU_FIRST can be applied on any data type. The data type of the result is the same as the input column data type.

If no value in the child table exists for the element in the parent table (either because all values of the child table column are filtered out, or because no corresponding value exists in the first place), NULL will be returned.

Syntax

PU_FIRST ( parent_table, child_table.column [, filter_expression] [, order_by_expression] )

Examples

Return the case ID of the smallest case table value for each company code:

Query
Column1
"companyDetail"."companyCode"
Column2
PU_FIRST("companyDetail", "caseTable"."caseId", order by "caseTable"."value")
Input
caseTable
caseId : INTcompanyCode : STRINGvalue : INT
1
'001'
600
2
'001'
400
3
'001'
200
4
'002'
300
5
'002'
300
6
'003'
200
companyDetail
companyCode : STRINGcountry : STRING
'001''DE'
'002''DE'
'003''US'

Foreign Keys
caseTable.companyCodecompanyDetail.companyCode
Output
Result
Column1 : STRINGColumn2 : INT
'001'
3
'002'
4
'003'
6



Return the eventtime of the first activity for each case:

Query
Column1
"companyDetail"."caseId"
Column2
PU_FIRST("companyDetail", "activityTable"."eventtime")
Input
activityTable
caseId : INTactivity : STRINGeventtime : DATE
1
'A'
Fri Jan 01 2016 00:00:00.000
1
'B'
Tue Feb 02 2016 14:00:00.000
1
'C'
Sat Apr 02 2016 15:00:00.000
1
'D'
Sat Apr 02 2016 16:00:00.000
2
'A'
Fri Jan 01 2016 12:30:00.000
2
'B'
Fri Jan 01 2016 13:00:00.000
2
'C'
Fri Jan 01 2016 15:00:00.000
2
'D'
Fri Jan 01 2016 17:00:00.000
companyDetail
caseId : INTcountry : STRING
1
'DE'
2
'DE'

Foreign Keys
companyDetail.caseIdactivityTable.caseId
Output
Result
Column1 : INTColumn2 : DATE
1
Fri Jan 01 2016 00:00:00.000
2
Fri Jan 01 2016 12:30:00.000



Return the eventtime of the first activity that contains a 'B' for each case:

Query
Column1
"companyDetail"."caseId"
Column2
PU_FIRST("companyDetail", "activityTable"."eventtime", "activityTable"."activity" LIKE 'B')
Input
activityTable
caseId : INTactivity : STRINGeventtime : DATE
1
'A'
Fri Jan 01 2016 00:00:00.000
1
'B'
Tue Feb 02 2016 14:00:00.000
1
'C'
Sat Apr 02 2016 15:00:00.000
1
'D'
Sat Apr 02 2016 16:00:00.000
2
'A'
Fri Jan 01 2016 12:30:00.000
2
'B'
Fri Jan 01 2016 13:00:00.000
2
'C'
Fri Jan 01 2016 15:00:00.000
2
'D'
Fri Jan 01 2016 17:00:00.000
companyDetail
caseId : INTcountry : STRING
1
'DE'
2
'DE'

Foreign Keys
companyDetail.caseIdactivityTable.caseId
Output
Result
Column1 : INTColumn2 : DATE
1
Tue Feb 02 2016 14:00:00.000
2
Fri Jan 01 2016 13:00:00.000



Return the eventtime of the first activity that contains a 'X' for each case. As there exists no such activity, all activity table values are filtered out, which means that in both cases NULL is returned.

Query
Column1
"companyDetail"."caseId"
Column2
PU_FIRST("companyDetail", "activityTable"."eventtime", "activityTable"."activity" LIKE 'X')
Input
activityTable
caseId : INTactivity : STRINGeventtime : DATE
1
'A'
Fri Jan 01 2016 00:00:00.000
1
'B'
Tue Feb 02 2016 14:00:00.000
1
'C'
Sat Apr 02 2016 15:00:00.000
1
'D'
Sat Apr 02 2016 16:00:00.000
2
'A'
Fri Jan 01 2016 12:30:00.000
2
'B'
Fri Jan 01 2016 13:00:00.000
2
'C'
Fri Jan 01 2016 15:00:00.000
2
'D'
Fri Jan 01 2016 17:00:00.000
companyDetail
caseId : INTcountry : STRING
1
'DE'
2
'DE'

Foreign Keys
companyDetail.caseIdactivityTable.caseId
Output
Result
Column1 : INTColumn2 : DATE
1
null
2
null



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