Knowledge Base

PRB: More Than Nine Functions in Left Join Causes Memory Error

Article ID: 178494

Article Last Modified on 12/11/1999

APPLIES TO

Microsoft Visual FoxPro 5.0 Standard Edition
Microsoft Visual FoxPro 5.0a

This article was previously published under Q178494

SYMPTOMS

If there are more than nine functions in your left join SQL statement the following error occurs:

There is not enough memory to complete this operation.

RESOLUTION

Create separate User Defined Functions (UDFs) to eliminate the large number of functions in left join.

Create a program called Ztest.prg that contains the functions called by the UDF shown below:

   FUNCTION testfun1
   RETURN STR(a.Row1,4)+STR(a.Row2,4)+STR(a.Row3,4)+STR(a.Row4,4) ;
   +STR(a.Row5,4)

   FUNCTION testfun2
   RETURN STR(b.Row1,4)+STR(b.Row2,4)+STR(b.Row3,4)+STR(b.Row4,4) ;
   +STR(b.Row5,4)

Use the following code to execute the new SQL SELECT statement that calls the UDF code:

   SET PROCEDURE TO Ztest.prg
   SELECT * FROM test1 a LEFT JOIN test2 b ON testfun1() = testfun2()

STATUS

Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

Use the following commands to create two tables. Each table contains one record with five numeric fields:

      CREATE TABLE test1 (row1 n(4),row2 n(4),row3 n(4),row4 n(4), ;
      row5 n(4))
      CREATE TABLE test2 (row1 n(4),row2 n(4),row3 n(4),row4 n(4), ;
      row5 n(4))
      INSERT INTO test1 VALUE (1,2,3,4,5)
      INSERT INTO test2 VALUE (1,2,3,4,5)

Issue the command below in the Command window:

      SELECT * FROM Test1 a LEFT JOIN Test2 b ON ;
      STR(a.Row1,4)+STR(a.Row2,4)+STR(a.Row3,4)+STR(a.Row4,4)
      +STR(a.Row5,4) ;
      = STR(b.Row1,4)+STR(b.Row2,4)+STR(b.Row3,4)
      +STR(b.Row4,4)+STR(b.Row5,4)

Keywords: kbprb KB178494