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LISTJOIN ER function

  • Članak

The LISTJOIN function returns a Record list value that represents a new joined list of records that is created from the specified arguments.

Syntax

LISTJOIN (list 1 [, list 2, …, list N])

Arguments

list 1: Record list

A reference to a data source of the Record list data type. This argument is mandatory.

list N: Record list

A reference to a data source of the Record list data type. These additional arguments are optional.

Return values

Record list

The resulting list of records.

Usage notes

The structure of the list that is created contains only the fields that are present in the structure of every record list that is referenced in the arguments.

Example

You enter data source Record 1 of the Container type. This data source contains the following nested fields of the Calculated field type:

  • Code: This field contains an expression that returns a value of the String type.
  • Amount: This field contains an expression that returns a value of the Real type.

You then enter data source Record 2 of the Container type. This data source contains the following nested fields of the Calculated field type:

  • Amount: This field contains an expression that returns a value of the Real type.
  • IsValid: This field contains an expression that returns a value of the Boolean type.

ER model mapping designer page.

In this case, the expression LISTJOIN(LIST('Record 1'), LIST('Record 2')) returns a new list that contains two records.

ER model mapping designer page with two records.

The structure of this list consists of a single Amount field of the Real type, because this field is the only field that is presented in every argument of the called function.

ER model mapping designer page amount field.

Additional resources

List functions

Debug data sources of an executed ER format to analyze data flow and transformation