將具有不同列和數據的不同表合並

Question

我的問題是我有4種選擇

SELECT COUNT (*) AS regular
WHERE experience = 1 AND bl = 1

SELECT COUNT (*) AS rptmm
WHERE experience = 1 AND bl = 0

SELECT COUNT (*) AS new
WHERE experience = 0 AND bl = 0

SELECT COUNT (*) AS rptss
WHERE experience = 0 AND bl = 1

我希望結果一起顯示，並帶有各自的名稱，例如：

regular rptmm  new  rptss
  10      5     2     6

Answer 1

首先，我建議不要使用Count（ ）* 。 這個站點上有很多答案，解釋了為什么，所以我不再重復。

相反，我建議您使用這樣的查詢：

SELECT     (SELECT COUNT (tab.someColumnName)
           FROM TableName tab
           WHERE tab.experience = 1 AND tab.bl = 1) AS 'Regular',

           (SELECT COUNT (tab.someColumnName)
           FROM TableName tab               
           WHERE tab.experience = 1 AND tab.bl = 0) AS 'rptmm',

           (SELECT COUNT (tab.someColumnName)
           FROM TableName tab
           WHERE tab.experience = 0 AND tab.bl = 0) AS 'New',

           (SELECT COUNT (tab.someColumnName)
           FROM TableName tab
           WHERE tab.experience = 0 AND tab.bl = 1) AS 'rptss'

希望這可以幫助！！！

Answer 2

只需將UNION ALL放在您的四個語句之間，您將獲得四行，每行分別計數。 但是，您將丟失列名。 您也可以使用join獲得四列的一行。 只需在每個sql語句之間放置關鍵字join。

SELECT COUNT (*) AS regular
WHERE experience = 1 AND bl = 1
JOIN
SELECT COUNT (*) AS rptmm
WHERE experience = 1 AND bl = 0
JOIN
SELECT COUNT (*) AS new
WHERE experience = 0 AND bl = 0
JOIN
SELECT COUNT (*) AS rptss
WHERE experience = 0 AND bl = 1

Answer 3

您可以創建一個臨時表來為您保存所有這些數據：將Name1，Name2，Name3，Name4替換為您想調用的任何名稱。 這些將是列標題。

CREATE TABLE #Temp(
                        NAME1 INT
                       ,NAME2 INT
                       ,NAME3 INT
                       ,NAME4 INT
            )

INSERT INTO #Temp
(NAME1)
SELECT COUNT(*) AS regular
WHERE experience = 1 AND bl = 1

INSERT INTO #Temp
(NAME2)
SELECT COUNT(*) AS regular
WHERE experience = 1 AND bl = 0

INSERT INTO #Temp
(NAME3)
SELECT COUNT(*) AS regular
WHERE experience = 0 AND bl = 0

INSERT INTO #Temp
(NAME4)
SELECT COUNT(*) AS regular
WHERE experience = 0 AND bl = 1*

SELECT * FROM #Temp