需要像UNION的查詢，但在第二的相應列的別名和第n個查詢，而不是所述第一查詢的列/別名

Question

返回數據考慮此UNION兩個（或更多）的查詢：

SELECT activity AS activity1, completion AS status1, date_end AS date1 
    FROM activities 
    WHERE (
     matter LIKE '%JR161167' 
     AND activity LIKE '1.1 %' 
     AND DATEDIFF(CURDATE() , date_end) <120 
    ) 
UNION 
    SELECT activity AS activity2, completion AS status2, date_end AS date2 
    FROM activities 
    WHERE (
     matter LIKE '%JR161167' 
     AND activity LIKE '1.2 %' 
     AND DATEDIFF(CURDATE() , date_end) <120 
    ) 

活性列將包含一個可變字符串值，但該字符串將可靠地與1.1或1.2或1.3一起前置至1.9。

問題欄也是一個字符串，但會可靠地追加一個類似於JR161167的帳號。

我想查詢已經從內部過去的120天（這就是DATEFIFF部分）DATE_END所有記錄，符合指定帳號（JR161167），但在活動場中包含的任何和所有子「1 ñ「。

使用UNION可從單個表「activities」中返回正確的數據，但似乎沒有辦法在第一個查詢的列或別名下標題結果集。相反，我想是這樣的：

activity1    status1 date1  activity2 status2   date2 
-------------------------------------------------------------------------------- 
1.1 Step 1 begins... Incomplete 2017-4-16 1.2  Step 2 begins... Incomplete 2017-4-30 

相反，我的查詢棧的所有結果，不管是否含有1.1，1.2，1.3，等等，一個別名列標題，activity1下。與日期和完成字段數據相同的東西，它並不會很好地分類到相應的日期1，日期2等或狀態1，狀態2等。

我最近讀了一個看起來像這樣的例子，它貌似我要實現的邏輯，我不知道是否有人能理解其意圖，並幫助我制定正確的查詢：

SELECT date_end 
IF(WHERE description LIKE '1.1 %') AS date1, 
IF(WHERE description LIKE '1.2 %') AS date2` 
FROM activities 

Answer 1

SQL Fiddle

查詢1：

SELECT a1.*, a2.* 
FROM (
    SELECT matter, activity, completion, date_end 
    FROM activities 
    WHERE 
     matter LIKE '%JR16116' 
     AND activity = '1.1' 
     AND DATEDIFF(CURDATE(), date_end) <120 
) a1 
JOIN (
    SELECT matter, activity, completion, date_end 
    FROM activities 
    WHERE 
     matter LIKE '%JR16116' 
     AND activity = '1.2' 
     AND DATEDIFF(CURDATE(), date_end) <120 
) a2 
    ON a1.matter = a2.matter 

Results：

| matter | activity | completion | date_end | matter | activity | completion | date_end | 
|---------|----------|------------|------------|---------|----------|------------|------------| 
| JR16116 |  1.1 |   1 | 2017-04-22 | JR16116 |  1.2 |   1 | 2017-04-23 | 

查詢2：

-- other way without sub request but clean join 

SELECT 
    a.matter, a.activity, a.completion, a.date_end 
    ,a2.activity, a2.completion, a2.date_end 
    -- ,a3.activity, a3.completion, a3.date_end 
FROM activities a 
JOIN activities a2 
    ON (
     a.matter = a2.matter 
     AND a2.activity = '1.2' 
     AND DATEDIFF(CURDATE(), a2.date_end) <120 
    ) 
-- JOIN activities a3 
-- ON (
--  a.matter = a3.matter 
--  AND a3.activity = '1.3' 
--  AND DATEDIFF(CURDATE(), a3.date_end) <120 
-- ) 

WHERE 
    a.matter LIKE '%JR16116' 
    AND a.activity = '1.1' 
    AND DATEDIFF(CURDATE(), a.date_end) <120 

Results：

| matter | activity | completion | date_end | activity | completion | date_end | 
|---------|----------|------------|------------|----------|------------|------------| 
| JR16116 |  1.1 |   1 | 2017-04-22 |  1.2 |   1 | 2017-04-23 |