sql from row to columns

Question

Пожалуйста, помогите мне со следующей проблемой. хотите преобразовать данные строки в столбцы на основе значения "PeriodNum" столбец столбца max до периода8 ... в таблице есть несколько учителей ... ниже - всего лишь образец из 2 учителей.

Образец данных:

id  teachername course_name    periodnum courseid 
------------------------------------------------------------------ 
14088 Smith, John 1; Physical Education 9 GYM ABCD 1 10064 
14088 Smith, John 2; Physical Education 9 GYM ABCD 2 10064 
14088 Smith, John 3; Physical Education 11 GYM BD 3 10065 
14088 Smith, John 5; Physical Education 11 GYM AC 5 10065 
14088 Smith, John 6; Physical Education 11 GYM ABCD 6 10065 
14088 Smith, John 7; Health 9 P373 ABCD 7 10059 
14088 Smith, John 8; Physical Education 11 GYM AC 8 10065 
14088 Smith, John 8; Health 10 GYM BD 8 10066 
15411 Yong, Jerry 1; Science 6 ABCD 1 10078 
15411 Yong, Jerry 2; Science 9 ABCD 2 10078 
15411 Yong, Jerry 3; Science 11 BD 3 10078 
15411 Yong, Jerry 5; Science 11 AC 5 10078 
15411 Yong, Jerry 6; Science 11 ABCD 6 10078 
15411 Yong, Jerry 7; Maths P373 ABCD 7 10080 
15411 Yong, Jerry 8; Biology 11 AC 8 10041 

Я хочу иметь желаемого результата выглядеть следующим образом:

id teachername Period1 Period2 Period3 Period4 Period5 Period6 Period7 Period8 
14088 Smith, John 1; Physical Education 9 GYM ABCD 2; Physical Education 9 GYM ABCD 3; Physical Education 11 GYM BD NULL 5; Physical Education 11 GYM AC 6; Physical Education 11 GYM ABCD 7; Health 9 P373 ABCD 8; Physical Education 11 GYM AC + 8; Health 10 GYM BD 
15411 Yong, Jerry 1; Science 6 ABCD 2; Science 9 ABCD 3; Science 11 BD  5; Science 11 AC 6; Science 11 ABCD 7; Maths P373 ABCD 8; Biology 11 AC 

... спасибо так много.

Я пробовал следующий запрос

SELECT DISTINCT 
    t.[id], 
    t.[teachername] 
     ,t1.course_name AS period1,t2.course_name AS period2,t3.course_name AS period3, t4.course_name AS period4, t5.course_name AS period5, t6.course_name AS period6, 
     t7.course_name AS period7,t8.course_name AS period8 -- into ccs_test 
    FROM @teacher t 
     LEFT OUTER JOIN CompanyGrouped t1 ON t.[id]=t1.[id] AND t1.ColumnNumber=1 and t.periodnum=1 
     LEFT OUTER JOIN CompanyGrouped t2 ON t.[id]=t2.[id] AND t2.ColumnNumber=2 and t.periodnum=2 
     LEFT OUTER JOIN CompanyGrouped t3 ON t.[id]=t3.[id] AND t3.ColumnNumber=3 and t.periodnum=3 
     LEFT OUTER JOIN CompanyGrouped t4 ON t.[id]=t4.[id] AND t4.ColumnNumber=4 and t.periodnum=4 
     LEFT OUTER JOIN CompanyGrouped t5 ON t.[id]=t5.[id] AND t5.ColumnNumber=5 and t.periodnum=5 
     LEFT OUTER JOIN CompanyGrouped t6 ON t.[id]=t6.[id] AND t6.ColumnNumber=6 and t.periodnum=6 
     LEFT OUTER JOIN CompanyGrouped t7 ON t.[id]=t7.[id] AND t7.ColumnNumber=7 and t.periodnum=7 
     LEFT OUTER JOIN CompanyGrouped t8 ON t.[id]=t8.[id] AND t7.ColumnNumber=8 and t.periodnum=8 

С уважением, HT

Answer 1

Я принес данные в таблицу в SQL Server и возможностью поворота на результаты, которые вы искали.

SELECT ID 
, TeacherName 
,[1] as Period1 
,[2] as Period2 
,[3] as Period3 
,[4] as Period4 
,[5] as Period5 
,[6] as Period6 
,[7] as Period7 
,[8] as Period8 
FROM 
(SELECT ID, TeacherName, peridonum, course_name 
FROM teacher) src 
PIVOT 
(MAX(course_name) FOR peridonum in ([1],[2],[3],[4],[5],[6],[7],[8]) 
) pvt