SQL帮助数据透视表

Question

我有一个包含几列的表。除了最后一列不同之外，有多个包含相同信息的记录。我需要将最后一列合并为其他列。最多只能有3个其他列（课程，课程2，课程3）。以下是我的表格布局。谢谢你的帮助。

Columns
=============
EmployeeNumber  
Email   
LastName    
FirstName   
Address1    
City    
State   
Zip 
Phone   
Certified   
School  
EmployeeType    
BirthDate   
Course  
StaffNumber

让我尝试一个比我的桌子小的例子...

StaffID  FName       LName      Course
=========================================
1111      John       Smith      History
1111      John       Smith      AP History
1111      John       Smith      Economics
2222     Jane       Smith       Science
2222     Jane       Smith       Chemistry
2222     Jane       Smith       Geology

我需要它来阅读...

StaffID  FN       LN      Course1  Course2     Course3
=======================================================
1111    John     Smith    History  AP History  Economics
2222   Jane      Smith     Science   Chemistry   Geology

唯一需要包含不同数据的列就是Course。否则，将需要将具有相同数据的几行合并为一个行。

Answer 1

SELECT *
FROM
(
  SELECT
  EmployeeNumber,
  Email, LastName, FirstName,
  Address1, City, State,
  Zip, Phone,
  Certified,
  School,
  EmployeeType,
  BirthDate,
  StaffNumber,
  Course as CourseName,
  CONCAT('Course', row_number() over (partition by  EmployeeNumber order by Course)) AS Col
  FROM employee_courses
) src
PIVOT
(
   MAX(CourseName) 
   FOR Col IN ([Course1],[Course2],[Course3])
) pvt