MySQL數據顯示而不是一行多行

Question

我想知道如何根據字段值我沒有的情況下，選擇顯示上述數據成一排，但它的未來，如下圖

(SELECT lead_id, 
case lead_id 
case field_number when 1 then value end as firstname 

case field_number when 1 then value end as firstname, 
case field_number when 2 then value end as lastname, 
case field_number when 10 then value end as email, 

Answer 1

您正在試圖用條件彙總（這意味着你被子句缺少組的最大/最小功能）做到這一點：

SELECT lead_id, 
     MAX(CASE WHEN field_number = 1 then value end) as firstname, 
     MAX(CASE WHEN field_number = 2 then value end) as lastname, 
     MAX(CASE WHEN field_number = 10 then value end) as email 
FROM YourTable 
GROUP BY lead_id