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SQL - SELECT: 'Too many subqueries'
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À
18/01/2000 02:08:34
Walter Meester
HoogkarspelPays-Bas
Information générale
Forum:
Visual FoxPro
Catégorie:
Problèmes
Divers
Thread ID:
00319286
Message ID:
00319530
Vues:
24
Walter,

Recently I found another problem with SQL. In my case the Error message was 'SQL command is too complex'. I did a simple query like:
select town from towns where town IN ('BROO','FOXB',etc.), 32 codes.
Is my understanding correct, what I can not use IN function in SQLs? What the limitation of it's usage?

TIA

>
>I've encountered the same problem. It's seems to be either a BUG or an inproriate error message for a VFP limitation. The only solution I could come up with is to split up the SQL statement into 2 others.
>
>Walter,
>
>>Received the error message 'too many subqueries'. It didn't seem right to me. (Partly because I understood a subquery to be something different.)
>>
>>I did a very simple query. All INNER JOINS on one primary table. There were approximately 11 INNER JOINS to that table. I am pretty confident about my SQL SELECT statement. Just to be sure I used the query interface (builder?) to do the same thing. It build essentially the same code and the same error occurred.
>>
>>(I was hoping to be lazy and avoid writing the darn statement but here it is in crude example form...)
>>
>>SELE tbl1.*, tbl2.xyz2, tbl3.xyz3, tbl4.xyz4, tbl5.xyz5;
>>FROM tbl1, ;
>>INNER JOIN tbl2 ON tbl1.key2 = tbl2.key2;
>>INNER JOIN tbl3 ON tbl1.key3 = tbl3.key3;
>>INNER JOIN tbl4 ON tbl1.key4 = tbl4.key4;
>>INNER JOIN tbl5 ON tbl1.key5 = tbl5.key5
>>
>>Of course I had more INNER JOINs but all were joined on the one primary table.
>>
>>Is this a limitation of VFP? Any other pointers?
>>
>>Thanks.
If it's not broken, fix it until it is.


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