無法過濾姓名

Question

下面的查詢工作正常，但我無法搜索vehicle_name。就像我想搜索車輛名稱31一樣，但是當我輸入它時，搜索全部而不是31。請幫助

SELECT Vehicle_Name 
    ,Total_Weight 
    ,DATE 
    ,bilty_No 
FROM harvesting H 
INNER JOIN Vehicle V 
ON H.Vehicle_ID = V.Vehicle_ID 

UNION all 

SELECT Vehicle_Name 
    ,Total_Weight 
    ,DATE 
    ,Bilty_No 
FROM Blade_Harvesting BH 
INNER JOIN Vehicle V 
ON BH.Vehicle_ID = V.Vehicle_ID 

Answer 1

你必須把where條件你都select語句

SELECT Vehicle_Name 
    ,Total_Weight 
    ,DATE 
    ,bilty_No 
FROM harvesting H 
INNER JOIN Vehicle V 
ON H.Vehicle_ID = V.Vehicle_ID 
where Vehicle_Name like '31%' 
UNION all 

SELECT Vehicle_Name 
    ,Total_Weight 
    ,DATE 
    ,Bilty_No 
FROM Blade_Harvesting BH 
INNER JOIN Vehicle V 
ON BH.Vehicle_ID = V.Vehicle_ID 
where Vehicle_Name like '31%' 

同時發送車輛名稱作爲參數

SELECT Vehicle_Name 
     ,Total_Weight 
     ,DATE 
     ,bilty_No 
    FROM harvesting H 
    INNER JOIN Vehicle V 
    ON H.Vehicle_ID = V.Vehicle_ID 
    where Vehicle_Name = @Vehicle_Name 
    UNION all 

    SELECT Vehicle_Name 
     ,Total_Weight 
     ,DATE 
     ,Bilty_No 
    FROM Blade_Harvesting BH 
    INNER JOIN Vehicle V 
    ON BH.Vehicle_ID = V.Vehicle_ID 
    where Vehicle_Name = @Vehicle_Name 

Answer 2

你可以試試：

SELECT  Vehicle_Name, 
      Total_Weight, 
      DATE, 
      bilty_No 
FROM  (SELECT  Vehicle_Name, 
         Total_Weight, 
         DATE, 
         bilty_No 
      FROM  harvesting H 
      INNER JOIN Vehicle V ON H.Vehicle_ID = V.Vehicle_ID 

      UNION ALL 

      SELECT  Vehicle_Name, 
         Total_Weight, 
         DATE, 
         Bilty_No 
      FROM  Blade_Harvesting BH 
      INNER JOIN Vehicle V ON BH.Vehicle_ID = V.Vehicle_ID 
      ) s 
Where  s.Vehicle_ID = 31