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Q178494: PRB: More Than Nine Functions in Left Join Causes Memory Error

Article: Q178494
Product(s): Microsoft FoxPro
Version(s): WINDOWS:5.0,5.0a
Operating System(s): 
Keyword(s): kbvfp
Last Modified: 11-DEC-1999

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, versions 5.0, 5.0a 
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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
---------------------------

1. 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)

2. 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)

Additional query words:

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Keywords          : kbvfp 
Technology        : kbVFPsearch kbAudDeveloper kbVFP500 kbVFP500a
Version           : WINDOWS:5.0,5.0a
Issue type        : kbprb

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