如何在SQL一个单独的列

Question

我有从3和不同的表3列如下显示列值：

Job  Region  Status 
1   Asia  Started 
1   Europe  In Progress 
1   Americas Not Started 
2   ASIA  Completed 
2   Europe  Not Started 
2   Americas Not Started 

我希望它被显示在下面的格式：

Job  ASIA  Europe  Americas 
1  Started In Progress Not Started 
2  Completed Not Started Not Started 

有人可以帮我写这个sql代码吗？

Answer 1

一个简单的条件聚集会做的伎俩：如果您有未知Region小号

SELECT 
    Job, 
    Asia  = MAX(CASE WHEN Region = 'Asia' THEN Status END), 
    Europe = MAX(CASE WHEN Region = 'Europe' THEN Status END), 
    Americas = MAX(CASE WHEN Region = 'Americas' THEN Status END) 
FROM tbl 
GROUP BY Job 

---

，您可以使用动态交叉做到这一点：

DECLARE @sql NVARCHAR(MAX) = '' 

SELECT @sql = 
'SELECT 
    Job' + CHAR(10) 

SELECT @sql = @sql + 
' , MAX(CASE WHEN Region = '''+ Region +''' THEN Status END) AS ' + QUOTENAME(Region) + CHAR(10) 
FROM(
    SELECT DISTINCT Region FROM tbl 
) t 

SELECT @sql = @sql + 
'FROM tbl 
GROUP BY Job' 

PRINT(@sql) 
EXEC (@sql) 

SQL Fiddle