AZURE SYNAPSE - Compare two variables with function greater

Question

Hi everyone,

I have two lookup activities that are returning the number of records for two tables (Select Count(*) as Num_Rows From ...).
After each lookup activity I'm assigning the result to some variables defined like array type.

So far the previos step all looks fine, however when I try to compare both variables using an "If Condition" activity, the expression below is failing:

@Greater(variables('Source_NoRows')[0],variables('Target_NoRows')[0])

The error I receive is:

Error
{
"errorCode": "InvalidTemplate",
"message": "The function 'Greater' expects all of its parameters to be either integer or decimal numbers. Found invalid parameter types: 'Object'",
"failureType": "UserError",
"target": "If Condition1",
"details": ""
}

Answer 1

Hi @Sisif0 ,
Welcome to Microsoft Q&A platform and thankyou for posting your query.
As I understand your question, you are trying to compare the rowcount of two tables in If block and trying to perform action accordingly in true and false blocks. Please let me know if my understanding is incorrect.

Here, you are storing the output of lookup (rowcount of table) in variable which is not capable of holding integer value. Also, greater function only works with either integer or decimal.

You don't need to introduce set variable activities here. You can directly compare the two lookup output in the If condition activity using the expression : @greater(activity('Lookup_Source_NoRows').output.count,activity('Lookup_Target_NoRows').output.count)

Here is how your pipeline would look like: You can keep both the lookups in parallel as there is no dependency of one on another to wait.

Hope this will help. Please let us know if any further queries.

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