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SQL Update with Join

tablaFreak asked
Last Modified: 2017-04-05
Hi Experts,

Can anyone tell me why this query isn't working? I want to update rows with null 'Effective_Date' with related records with 'Effective_Date' not null.

What would you suggest?


Update si2
Set si2.Effective_Date = si.Effective_Date
from Specifications_Import2 si
Left join
      (Select Macola_Number, Spec_Version_Num, Effective_Date from Specifications_Import2 si
            where Effective_Date IS NULL) si2
       on si.Macola_Number = si2.Macola_Number and si.Spec_Version_Num = si2.Spec_Version_Num
where si.Effective_Date is not null
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