1 Reply Latest reply: May 8, 2012 2:54 AM by Bin Xue RSS

    Check if a table is already loaded

    Bin Xue

      Hi,

       

          I would like to check if a table exist before dropping this table. I used this function

       

                if noOfRows('mytable')>0 then

                drop table mytable; 

                endif

       

         However, later i found that if a table has been created but contains no data. noOfRows function also return a number which is less or equals to zero. The scenario is as below:

       

      mytable:

      load *

      from mytable;

      inner join

      load * from

      anothertable;

       

      The above scenario creates mytable and makes it empty by a inner join.

       

      This causes my table not being dropped. Could anyone tell me if there is another way of checking the existence of a table?

        • Check if a table is already loaded
          Bin Xue

          Hi in case anybody facing the same problem. I've already found a solution. I check the output of noOfRows('table') under debug. If a table does not exist, it returns null, else it returns the number of rows in a table. So in order to check whether a table exists of not. We should use

           

          if noOfRows('table') <>null then

          ...

          endif