Hi Vasilis,
you need to write a query in SQL Tool to get the records by filtering the mentioned column, by using the where clause.
If you wish to get all columns in the list use this-
Select * From {EntityName} where {EntityName}.[EntityAttributeName] = @Query Parameter Name
you can create the query parameter to pass a attribute value by which you wish to filter the records.
you may need to create one output Structure/Entity. in this case where you want all columns in to the record, just have the output structure as you Entity.
you can test your output, if the query is running properly , by passing test input values.
If you whish to have some of the columns in the output ,you need to mention the columns name and seperate them with comma,in select ,like-
Select {EntityName}.[EntityAttribute1Name], {EntityName}.[EntityAttribute2Name]
From {EntityName} where {EntityName}.[EntityAttributeName] = @Query Parameter Name
rest process is same.
Hope this helps,
Thanks Mita