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Why this SQL Select does not work?
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À
11/03/2022 14:50:09
Lutz Scheffler
Lutz Scheffler Software Ingenieurbüro
Dresden, Allemagne
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01683823
Message ID:
01683828
Vues:
32
>>>>Hi,
>>>>
>>>>I have been struggling with the following issue.
>>>>
>>>>I will start with the SQL Select that works:
>>>>
>>>>select * from work_his join eq_file on eq_file.id_number = work_his.id_number and eq_file.site_no = 8 
>>>>
>>>>
>>>>The above selects records from the table WORK_HIS. No problem.
>>>>
>>>>Now I want to add a WHERE so that only more recent records are selected. Here is the SQL Select:
>>>>
>>>>select * from work_his join eq_file on eq_file.id_number = work_his.id_number and eq_file.site_no = 8 
>>>>where cast(DATE_CLOS as date) = ( Select MAX( cast(DATE_CLOS as date)) from work_his)
>>>>
>>>>
>>>>That is, I added the WHERE to the above SQL Select. Now No records are selected.
>>>>
>>>>What am I missing?
>>>>
>>>>TIA
>>>
>>>Maybe ALL Date_Clos field are NULLs?
>>
>>I checked. There are not. But I will double check.
>
>Aside boring *, try to alias your cursors, as usual
>
>select * from work_his AS Cur1 join eq_file  AS Cur2 on Cur2.id_number = Cur1.id_number and Cur2.site_no = 8 
>where cast(Cur1.DATE_CLOS as date) = ( Select MAX( cast(Cur3.DATE_CLOS as date)) from work_his AS Cur3)
>
>
>else it is not clear where the field belongs.
>
>Also, please care to mention if this is VFP SQL or?

This is MS SQL Server. I am testing in the SSMS. I will add the aliases
Thanks.
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