SQL dynamic pivot for goals [duplicate]

问题:

This question already has answers here:

Convert Rows to columns using 'Pivot' in SQL Server (8 answers)

Closed 3 years ago.

Let's assume I have a table with the following rows and columns

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

I want to display above table in below format:

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

The field goals is dynamic, please help me out. Thank you.

回答1:

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,'kiran','coding'),
    (101,'kiran','readcss'),
    (102,'rohit','coding'),
    (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('')
    ),1,1,''
);

DECLARE @stmt NVARCHAR(MAX)=N'
    SELECT *    
    FROM (
            SELECT 
                EmpCode,Empname,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;

Result:

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