將行值轉換爲動態列名稱並查找總量 - PIVOT

Question

我有3個表A，B，C。像

需要顯示一些SQL表結合這3個表（結果）的細節。 我需要動態顯示日期字段的值作爲列標題。 推薦此鏈接http://www.databasejournal.com/features/mssql/converting-rows-to-columns-pivot-and-columns-to-rows-unpivot-in-sql-server.html但它是用於靜態值。有沒有什麼辦法來實現這個動態數據。

在此先感謝

Answer 1

這應該工作

CREATE TABLE #A (A_ID INT, A_Name Varchar(100)) 
INSERT INTO #A VALUES (1,'X'),(2,'Y'),(3,'Z'); 

CREATE TABLE #B (B_ID INT,A_ID INT, B_Name Varchar(100)) 
INSERT INTO #B VALUES (10,1,'P'),(11,2,'Q'),(12,1,'R'); 

CREATE TABLE #C (B_ID INT,C_DATE DATE, C_QTY INT) 
INSERT INTO #C VALUES (10,'2017-01-01',100),(10,'2017-01-02',200), 
         (11,'2017-01-03',250),(11,'2017-01-03',50),(12,'2017-01-07',300); 
------------- PIVOT AS FOLLOWS      

DECLARE @Cols AS NVARCHAR(MAX), 
     @query AS NVARCHAR(MAX) 
SET @Cols = STUFF((SELECT distinct ',' + QUOTENAME(C_DATE) FROM #C 
    FOR XML PATH(''), TYPE ).value('.', 'NVARCHAR(MAX)') ,1,1,'')  

SET @query = 'SELECT* FROM(
       SELECT 
       A.A_Name, 
       B.B_Name, 
       C.C_DATE, 
       C.C_QTY 
      FROM #A A 
      RIGHT JOIN #B B ON A.A_ID=B.A_ID 
      RIGHT JOIN #C C ON B.B_ID=C.B_ID 
       ) ABC 
PIVOT 
(
SUM(C_QTY) FOR [C_DATE] IN (' + @Cols + ') 

) AS PV1'; 

EXEC sp_executesql @query 

DROP TABLE #A; DROP TABLE #B;DROP TABLE #C 

Answer 2

在與永源給以前的解決方案的關係，爲了與整體數量增加一個「結果」欄中的A_name和B_name我們可以創建總計視圖並將其添加到主查詢中

CREATE TABLE A (A_ID INT, A_Name Varchar(100)) 
INSERT INTO A VALUES (1,'X'),(2,'Y'),(3,'Z'); 

CREATE TABLE B (B_ID INT,A_ID INT, B_Name Varchar(100)) 
INSERT INTO B VALUES (10,1,'P'),(11,2,'Q'),(12,1,'R'); 

CREATE TABLE C (B_ID INT,C_DATE DATE, C_QTY INT) 
INSERT INTO C VALUES (10,'2017-01-01',100),(10,'2017-01-02',200), 
        (11,'2017-01-03',250),(11,'2017-01-03',50),(12,'2017-01-07',300); 

-- Create the view separately after having created the tables 
CREATE VIEW R_sum 
AS 
SELECT A.A_id, B.B_id, SUM(C.C_qty) AS Sum_qty 
FROM  A INNER JOIN 
        B ON A.A_id = B.A_id INNER JOIN 
        C ON B.B_id = C.B_id 
GROUP BY A.A_id, B.B_id 

------------- PIVOT AS FOLLOWS      

DECLARE @Cols AS NVARCHAR(MAX), 
     @query AS NVARCHAR(MAX) 
SET @Cols = STUFF((SELECT distinct ',' + QUOTENAME(C_DATE) FROM C 
    FOR XML PATH(''), TYPE ).value('.', 'NVARCHAR(MAX)') ,1,1,'')  

SET @query = 'SELECT * FROM(
       SELECT 
       A.A_Name, 
       B.B_Name, 
       C.C_DATE, 
       C.C_QTY, 
       R.Sum_qty as Result 
      FROM A A 
      INNER JOIN B ON A.A_ID=B.A_ID 
      RIGHT JOIN C ON B.B_ID=C.B_ID 
      RIGHT JOIN R_Sum R ON B.A_ID=R.A_ID AND B.B_ID=R.B_ID 
       ) ABC 
PIVOT 
(
SUM(C_QTY) FOR [C_DATE] IN (' + @Cols + ') 

) AS PV1'; 

EXEC sp_executesql @query