How to avoid to add duplicate string in append string connector logic app

问题

I have following json array input -

"results": [
  { "tableName" : "ABC","id":"11"},
  { "tableName" : "ZX","id":"11"},
  { "tableName" : "ABC","id":"11"}
]}

In logic app i have used `` in For_each I'm able to append string successfuly but how to avoid adding already present string ? like above example my current output is - ABC,ZX,ABC i want - ABC,ZX

回答1:

You could use the Array to implement, there is a union function to return a collection that has all the items from the specified collections. It will return a collection without duplicate string. Then use join action to return the string.

Cause the union function must contain two collection at least, so I used two same collections. The expression is like this: union(variables('tablename'),variables('tablename'))

The below is the result.

Hope this could help you.

来源：https://stackoverflow.com/questions/56885683/how-to-avoid-to-add-duplicate-string-in-append-string-connector-logic-app