SQL將自動更新

Question

我有這樣的看法： CREATE VIEW AS

SELECT 
     p.pr_id 
     ,p.arenda 
     ,p.PlotArea 
     ,p.OwnershipTitle 
     ,p.Price 
     ,p.NotaryCosts 
     ,p.AgentFee 
     ,p.CtrNO 
     ,isnull(p.Price,0)-isnull(a.Price,0) as Diferente 
     ,isnull(p.Price,0)+isnull(p.NotaryCosts,0)+isnull(p.AgentFee,0) as TotalCosts 

from nbProcuri p 
     left JOIN nbAchizitii a 
     ON p.PlotArea = a.PlotArea and p.CtrNo=a.CtrNo 
where a.CtrNO is null and a.PlotArea is null 

我想那些2分表用另一個叫Cadastrial，我也有一個叫PlotArea列相關。如果p.PlotArea = c.PlotArea，則p.arenda列應更新自身，值爲'yes'，否則應填入no。 這有可能嗎？ 謝謝！

Answer 1

像這樣：

UPDATE p 
SET p.arenda = CASE WHEN p.PlotArea IS NULL THEN 'no' -- For not matched 
        ELSE 'yes' -- for matched 
       END 
FROM nbProcuri p 
LEFT JOIN Cadastrial c ON p.PlotArea = c.PlotArea 
LEFT JOIN nbAchizitii a 
     ON p.PlotArea = a.PlotArea and p.CtrNo = a.CtrNo 
WHERE a.CtrNO IS NULL 
    AND a.PlotArea IS NULL;