DOCUMENT:Q169791 11-DEC-1999 [foxpro] TITLE :PRB: Query Bases Result Set Field Size On Non-Included Values PRODUCT :Microsoft FoxPro PROD/VER:MACINTOSH:2.5b,2.5c,2.6a,3.0b; MS-DOS:2.0,2.5,2.5a,2.5b,2.6,2.6a; WINDOWS:2.5,2.5a,2.5b OPER/SYS: KEYWORDS:kbHWMAC kbvfp ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft FoxPro for MS-DOS, versions 2.0, 2.5, 2.5a, 2.5b, 2.6, 2.6a - Microsoft FoxPro for Windows, versions 2.5, 2.5a, 2.5b, 2.6, 2.6a - Microsoft FoxPro for Macintosh, versions 2.5b, 2.5c, 2.6a - Microsoft Visual FoxPro for Macintosh, version 3.0b - Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a ------------------------------------------------------------------------------- SYMPTOMS ======== A query may result with truncated values in an expression columns. CAUSE ===== The expression column is basing its width on the first record value of the source table. RESOLUTION ========== Change the expression to use an IIF() function that returns a value of necessary width. This forces FoxPro to create a column wide enough to hold the results of the expression column. NOTE: The example code uses the table created at the bottom of this article in the MORE INFORMATION section. Here's an example: SELECT *, IIF(ISNULL(fld2),SPACE(15),TTOC(fld2,1)) AS test ; FROM temp WHERE fld2 is NOT NULL -or- Change the source table's order so that the first record's value in the source table is wide enough to hold the expression columns output. An index order cannot be used here, since FoxPro opens the source table in another workarea. Using an additional query can do this. Here's an example: SELECT * FROM temp ORDER BY fld2 DESCEND INTO CURSOR temp2 SELECT *, TTOC(fld2,1) AS test FROM temp2 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. Execute the following five lines to create and populate a table: CREATE TABLE temp (fld1 C(3), fld2 T NULL, fld3 C(3)) INSERT INTO temp (fld1, fld2, fld3) VALUES ('aaa',NULL,'aaa') INSERT INTO temp (fld1, fld2, fld3) VALUES ('bbb',datetime(),'bbb') INSERT INTO temp (fld1, fld2, fld3) VALUES ('ccc',NULL,'ccc') INSERT INTO temp (fld1, fld2, fld3) VALUES ('ddd',datetime(),'ddd') 2. Execute the following lines from the Command window: SELECT *, TTOC(fld2,1) AS test FROM temp SELECT *, TTOC(fld2,1) AS test FROM temp WHERE fld2 IS NOT NULL Note that the test column comes up improperly sized for both queries. The test column is based solely on the width of the source table's first record, a 1 byte NULL character. Thus, the column shows only a 1 from the result of the TTOC() function. This occurs even when records that contain NULL are not included in the result set, per the second query. Additional query words: ====================================================================== Keywords : kbHWMAC kbvfp Technology : kbHWMAC kbOSMAC kbVFPsearch kbAudDeveloper kbFoxproSearch kbZNotKeyword3 kbFoxPro250bMac kbFoxPro260aMac kbFoxPro250cMac kbFoxPro200DOS kbFoxPro250DOS kbFoxPro250aDOS kbFoxPro250bDOS kbFoxPro260DOS kbFoxPro260aDOS kbFoxPro260 kbFoxPro250 kbFoxPro250a kbFoxPro250b kbFoxPro260a kbVFP300bMac kbVFP300 kbVFP300b kbVFP500 kbVFP500a Version : MACINTOSH:2.5b,2.5c,2.6a,3.0b; MS-DOS:2.0,2.5,2.5a,2.5b,2.6,2.6a; WINDOWS:2.5,2.5a,2.5b,2.6,2.6a,3.0,3.0b,5.0,5.0a Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.