SQL案例，並喜歡在where子句

Question

我已經打破我的頭在這個希望有可能

declare @locationType varchar(50); 
declare @SearchTerm NVARCHAR(100); 

SELECT column1, column2 
FROM whatever 
WHERE 
CASE @locationType 
    WHEN 'location' THEN account_location LIKE @SearchTerm 
    WHEN 'area' THEN Area LIKE @SearchTerm 
    WHEN 'division' THEN xxx_location_division LIKE @SearchTerm 
END 

我複製的代碼形式另一個相關的帖子here。

我得到的錯誤：

Incorrect syntax near the keyword 'LIKE'.

Answer 1

declare @locationType varchar(50); 
declare @SearchTerm NVARCHAR(100); 

SELECT column1, column2 
FROM whatever 
WHERE 
    (@locationType = 'location' AND account_location LIKE @SearchTerm) 
OR 
    (@locationType = 'area' AND Area LIKE @SearchTerm) 
OR 
    (@locationType = 'division' AND xxx_location_division LIKE @SearchTerm) 

確保@SearchTerm開始與/結束與% - >或使用'%' + @SearchTerm + '%'。

有關LIKE operator的更多信息。

---更新----

SELECT column1, column2 
FROM whatever 
WHERE 
(
    CASE @locationType 
    WHEN 'location' THEN account_location 
    WHEN 'area' THEN Area 
    WHEN 'division' THEN xxx_location_division 
    END 
) LIKE @SearchTerm 

Answer 2

如果沒有需要檢查字符串插圖中，那麼你可以做的伎倆象下面這樣：

SELECT column1, column2 
FROM whatever 
WHERE @SearchTerm LIKE 
CASE @locationType 
    WHEN 'location' THEN account_location 
    WHEN 'area' THEN Area 
    WHEN 'division' THEN xxx_location_division 
END 

或者，你可以這樣做：

SELECT column1, column2 
FROM whatever 
WHERE 
    (@locationType = 'location' AND account_location LIKE @SearchTerm) 
OR 
    (@locationType = 'area' AND Area LIKE @SearchTerm) 
OR 
    (@locationType = 'division' AND xxx_location_division LIKE @SearchTerm)