sql-server – 目标的SQL动态数据透视

参见英文答案 > Convert Rows to columns using ‘Pivot’ in SQL Server7个
假设我有一个包含以下行和列的表

EmpCode    Empname   Goals
-------    ----     ------
101        kiran     readsql
101        kiran     coding
101        kiran     readcss
102        rohit     coding
102        rohit     readjava
103        pradi     do nothing

我想以下面的格式显示上表：

EmpCode    Empname   Goal1     Goal2    Goal3
-------    ----     ------     ------   ------ 
101        kiran     readsql   coding   readcss
101        rohit     coding    readjava
103        pradi     do nothing

实地目标是动态的,请帮助我.谢谢.

解决方法

CREATE TABLE #tt(id INT IDENTITY(1,1) PRIMARY KEY,EmpCode INT,Empname VARCHAR(2566),Goals VARCHAR(256));
INSERT INTO #tt(EmpCode,Empname,Goals)VALUES
    (101,'kiran','readsql'),(101,'coding'),'readcss'),(102,'rohit','readjava'),(103,'pradi','do nothing');

DECLARE @goal_cols NVARCHAR(MAX)=STUFF((
    SELECT DISTINCT N',Goal'+CAST(ROW_NUMBER()OVER(PARTITION BY empcode ORDER BY id) AS VARCHAR(3))
    FROM #tt
    FOR XML PATH('')
    ),1,''
);

DECLARE @stmt NVARCHAR(MAX)=N'
    SELECT *    
    FROM (
            SELECT 
                EmpCode,Goals,goal_id=''Goal''+CAST(ROW_NUMBER()OVER(PARTITION BY empcode ORDER BY id) AS VARCHAR(3))
            FROM 
                #tt
        ) AS s
        PIVOT(MAX(Goals) FOR goal_id IN ('+@goal_cols+')) AS p
    ORDER BY EmpCode;';

EXECUTE sp_executesql @stmt;

DROP TABLE #tt;

结果：

+---------+---------+------------+----------+---------+
| EmpCode | Empname |   Goal1    |  Goal2   |  Goal3  |
+---------+---------+------------+----------+---------+
|     101 | kiran   | readsql    | coding   | readcss |
|     102 | rohit   | coding     | readjava | NULL    |
|     103 | pradi   | do nothing | NULL     | NULL    |
+---------+---------+------------+----------+---------+

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