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How to use subquery
Message
From
14/06/2011 09:41:35
 
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Environment versions
Visual FoxPro:
VFP 9 SP1
Miscellaneous
Thread ID:
01514285
Message ID:
01514292
Views:
44
>>>I am trying to figure out how to use a subquery in the following example:
>>>
>>>Table1
>>>PK_FLD, TASK_NO
>>>
>>>Table2
>>>TASK_NO, FLDA, FLDB
>>>
>>>I want the resulting query to have as many records as there are in Table1 adding columns FLDA and FLDB from
>>>Table2 according to the matching TASK_NO.
>>>
>>>My attempt at this query is as following
>>>
>>>Select Table1.PK_FLD, Table1.TASK_NO, T2.FLDA, T2.FLDB from Table1 where (select * from Table2 where 
>>>TASK_NO = Table1.TASK_NO) T2 
>>>
>>>
>>>But I get error of incorrect use of subquery. What am I missing? TIA.
>>
>>use JOIN instead of subquery.
>>
>>Select Table1.PK_FLD,;
>>       Table1.TASK_NO,;
>>       T2.FLDA,;
>>       T2.FLDB;
>>from Table1 ;
>>INNER JOIN Table2 T2 ON T2.TASK_NO = Table1.TASK_NO;
>>** You could use LEFT JOIN if you want ALL records from Table1 and only matching records from Table2
>>
>
>I am sorry that I probably mislead you (and Yuri) since I didn't indicate that I want records from Table2 (that do non have matching to Table1 on TASK_NO). That is, I want all records from Table1 and the records from Table2 that do not have matches. I think INNER or LEFT JOINT won't give me that. At least I tried.
>
>Thank you and Yuri.


Don't get it.
Some example data and desired result?
Against Stupidity the Gods themselves Contend in Vain - Johann Christoph Friedrich von Schiller
The only thing normal about database guys is their tables.
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