3 Replies Latest reply on Nov 7, 2018 6:01 PM by Geno Chow

    Tableau prep is not utilizing the join function with database source

    Geno Chow

      I figure out that when I import a very large data from my database and join with a specific list of customers using Tableau Prep's join. It took me 8 minutes to get a result while when I write a SQL and put the specific list in where clause, it return to me within seconds!!! I wonder why Tableau Prep not using the step result as a optimized SQL query while extract the result? Or it should consider to add a filter function which able to add the result of previous step as a direct filtering rules when executing the data query. I hope this will be done soon or Prep is useless to me.