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Intermediate Table Variables

Leveraging SQLScript in Stored Procedures, User Defined Functions, and User Defined Libraries
You will learn

In this exercise you will modify the code of procedure get_po_header_data again to use a single tabular output. Existing queries will be reused based on intermediate table variables.

rich-heilmanRich HeilmanJanuary 5, 2021
Created by
ccmehil
September 5, 2016
Contributors
rich-heilman
ccmehil

Prerequisites

  • Step 1

    Return to your procedure called get_po_header_data.

    Existing Procedure

    Delete the output parameters which you defined in the last section.

    Define output
  • Step 2

    Define a new output parameter as shown

    New output
  • Step 3

    Rename EX_PO_CREATE_CNT to PO_CREATE_CNT. Also rename EX_PO_CHANGE_CNT to PO_CHANGE_CNT

    change name
  • Step 4

    Modify the two SELECT statements and add AS EID after the EMPLOYEEID field.

    modify select
  • Step 5

    Next, add another SELECT statement after the 2 previous SELECT statements as shown. This statement uses the previously defined table variables.

    add another select
  • Step 6

    The completed code should be very similar to this.

    PROCEDURE "get_po_header_data"(
             OUT EX_TOP_3_EMP_PO_COMBINED_CNT TABLE(
                  LOGINNAME NVARCHAR(12),
                  CREATE_CNT INTEGER,
                  CHANGE_CNT INTEGER,
                  COMBINED_CNT INTEGER )  )  
       LANGUAGE SQLSCRIPT
       SQL SECURITY INVOKER
       --DEFAULT SCHEMA <default_schema_name>
       READS SQL DATA AS
    BEGIN
    
    po_create_cnt =   SELECT COUNT(*) AS CREATE_CNT, "HISTORY.CREATEDBY.EMPLOYEEID" as EID
         FROM "PO.Header" WHERE PURCHASEORDERID IN (
                         SELECT PURCHASEORDERID
                              FROM "PO.Item"
              WHERE "PRODUCT.PRODUCTID" IS NOT NULL)
    GROUP BY  "HISTORY.CREATEDBY.EMPLOYEEID";
    
    po_change_cnt = SELECT COUNT(*) AS CHANGE_CNT, "HISTORY.CHANGEDBY.EMPLOYEEID" as EID
         FROM "PO.Header"  WHERE PURCHASEORDERID IN (
                         SELECT PURCHASEORDERID
                              FROM "PO.Item"
              WHERE "PRODUCT.PRODUCTID" IS NOT NULL)
    GROUP BY  "HISTORY.CHANGEDBY.EMPLOYEEID";
    
    EX_TOP_3_EMP_PO_COMBINED_CNT =
            SELECT emp.LOGINNAME, crcnt.CREATE_CNT, chcnt.CHANGE_CNT,  crcnt.CREATE_CNT +
            chcnt.CHANGE_CNT AS COMBINED_CNT
                FROM "MD.Employees" as emp
                LEFT OUTER JOIN :PO_CREATE_CNT AS crcnt
                 ON emp.EMPLOYEEID = crcnt.EID
               LEFT OUTER JOIN :PO_CHANGE_CNT AS chcnt
               ON emp.EMPLOYEEID = chcnt.EID
              ORDER BY COMBINED_CNT DESC LIMIT 3;
    
    END
    
    
  • Step 7

    Save the procedure. Use what you have learned already and perform a build on your hdb module.

    save Procedure
  • Step 8

    Return to the Database Explorer page and use what you have learned and generate a new call statement for the procedure and run it.

    The results are then shown.

    Results
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