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Select TOP 1 on two fields
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To
01/02/2023 14:47:52
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Miscellaneous
Thread ID:
01686062
Message ID:
01686065
Views:
36
>>Hi,
>>
>>I am creating a SQL Select that will select ONE record based on two fields. The two fields are DATE_FLD and ORDER_NO field. There could be more than one records with the same DATE_FLD value (e.g. "01/01/2023) but the ORDER_NO will be different for each record. I need to select a record with the largest value in the ORDER_NO field.
>>
>>Here is my test:
>>
>>select TOP 1 CONVERT(VARCHAR(10),DATE_FLD,101) + STR(ORDER_NO), FIELD2, FIELD3 from MyTable order by DATE_FLD, ORDER_NO DESC
>>
>>
>>Will the above give me what I am looking for?
>>
>
>That's overkill. Use:
>
>
>SELECT DATE_FLD, MAX(ORDER_NO) FROM MyTable GROUP BY DATE_FLD 
>
>
>Tamar

Thank you!
Follow up question: If I add a JOIN clause to the above and the JOIN does not find a record, will the resulting Query have 0 records?
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