INFO: Limitations of View Designer vs. CREATE SQL VIEW Command (156667)


The information in this article applies to:

  • Microsoft Visual FoxPro for Windows 5.0
  • Microsoft Visual FoxPro for Windows 6.0
This article was previously published under Q156667

SUMMARY

The View Designer in Visual FoxPro is a useful tool for creating views. This article discusses a couple of limitations on creating views with the View Designer versus creating views programmatically using the CREATE SQL VIEW command.

MORE INFORMATION

The following limitations exist when creating views with the View Designer:

  1. The View Designer is unable to load any views that have a sub-select in the filter.

    Example: 
       CREATE VIEW view1 AS SELECT order_id FROM orders ;
        WHERE order_id IN (SELECT order_id FROM order_line_items)
  2. With the new JOIN feature, views that are built with joins in the View Designer must be built in a specific manner: 
       Example 1: 3 tables: tableA, tableB, tableC
               CORRECT: tableA -> tableB -> tableC
						
       CREATE VIEW view1 AS SELECT * FROM tableA ;
     INNER JOIN tableB INNER JOIN tableC ON ;
     tableB.linkcol = tableC.linkcol ON ;
     tableA.linkcol = tableB.linkcol
						
       Example 2: 3 tables: tableA, tableB, tableC
               INCORRECT : tableA -> tableB,  tableA -> tableC
						
       CREATE VIEW view1 AS SELECT * FROM tableA ;
     INNER JOIN tableB INNER JOIN tableC ON ;
     ON tableA.linkcol = tableC.linkcol ON ;
     tableA.linkcol = tableB.linkcol
Example 2 will cause an error when you try to load it into the View Designer.
Modification Type:MajorLast Reviewed:10/15/2003
Keywords:kbDatabase kbinfo KB156667
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