列的案例表達

Question

我有一個查詢，我想返回字符串而不是數字，查詢的值是DegreeID

select P.DegreeID, D.DegreeName, P.ProgramName
            from pagesite sp
                left join table2.Degrees D on P.DegreeID = D.DegreeID

我想將case表達式應用於swicth花瓶語句等的degreeID字段，如果它是1則像masters一樣命名，如果是2 ，則將其命名為bachelors並使用others默認大小寫

Answer 1

    select case
            when D.DegreeID= 1
             then 'masters'
            when D.DegreeID= 2
             then 'bachelors'
            else'others'
           end as ImNotSureTheColumnNameYouWantHere
      from pagesite sp
 left join table2.Degrees D 
        on P.DegreeID = D.DegreeID

Answer 2

您需要做的就是添加CASE表達式。 我敢肯定，網上有很多例子。

SELECT (
    CASE P.DegreeID
        WHEN 1 THEN 'masters'
        WHEN 2 THEN 'bachelors'
        ELSE 'Others'
    END
    ) AS Degree
    , D.DegreeName, P.ProgramName
FROM pagesite sp
LEFT JOIN table2.Degrees D ON P.DegreeID = D.DegreeID