SQL Transpose \ Pivot

Question

Я пытаюсь сделать еженедельное резюме отдельных элементов из исходной таблицы. запрос должен возвращать 1 строку для каждого указанного типа товара (то есть двери, окна и т.д.) , если ни один элемент не будет возвращен, он должен возвращать нулевые значения

Original Table 
+-------+-----------+----------+-----------+-------+------+ 
|ITEMID | Date  |ItemType |Account No |Amt | Desc | 
+-------+-----------+----------+-----------+-------|------| 
|10  |2014-01-01 | Doors |12345  |10  | ab | 
+-------+-----------+----------+-----------+-------|------| 
|10  |2014-01-02 | Doors |12345  |10  | cd | 
+-------+-----------+----------+-----------+-------|------| 
|10  |2014-01-03 | Doors |12345  |10  | ef | 
+-------+-----------+----------+-----------+-------|------| 
|10  |2014-01-04 | Doors |12345  |10  | gh | 
+-------+-----------+----------+-----------+-------|------| 
|10  |2014-01-05 | Doors |12345  |10  | ij | 
+-------+-----------+----------+-----------+-------|------| 
|10  |2014-01-06 | Doors |12345  |10  | kl | 
+-------+-----------+----------+-----------+-------|------| 
|10  |2014-01-07 | Doors |12345  |10  | mn | 
+-------+-----------+----------+-----------+-------|------| 

target table: 

+----------+-----------+------+-------+------+-------+------+-------+------+-------+------+-------+------+-------+------+-------+ 
| ItemType | AccountNo | Amt1 | DESC1 | Amt2 | Desc2 | Amt3 | Desc3 | Amt4 | Desc4 | Amt5 | Desc5 | Amt6 | Desc6 | Amt7 | Desc7 | 
+----------+-----------+------+-------+------+-------+------+-------+------+-------+------+-------+------+-------+------+-------+ 
| Doors | 1234  | 10 | ab | 11 | cd | 12 | ef | 13 | gh | 14 | ij | 15 | kl | 16 | mn | 
+----------+-----------+------+-------+------+-------+------+-------+------+-------+------+-------+------+-------+------+-------+ 

я был в состоянии собрать ниже запрос для этого задача, основанная на ответе ниже, но есть ли лучший, более эффективный способ сделать это ????

SELECT t1.Amt AS amt1, t1.desc AS desc1, t2.amt AS amt2, t2.desc AS desc2,t3.Amt AS amt3, t3.desc AS desc3 

t4.amt А.С. amt4, t4.desc AS desc4, t5.amt AS amt5, t5.desc AS desc5, t6.amt AS amt6, t6.desc AS desc6, t7.amt AS amt7, t7 .desc AS desc7, FROM mytable t1 INNER JOIN mytable t2 ON t2.date = '2014-01-01' И t2.itemid = 10 И t2.type = 'Doors' INNER JOIN mytable t3 ON t3.date = '2014-01-02' И t3.itemid = 10 И t3.type = 'Doors' INNER JOIN mytable t3 ON t3.date = '2014-01-03' И t3.itemid = 10 И t4.type = ' Дверь INNER JOIN mytable t3 ON t3.date = '2014-01-04' И t3.itemid = 10 И t5.type = 'Doors' INNER JOIN mytable t3 ON t3.date = '2014-01-05' И t3.itemid = 10 И t6.type = 'Двери' INNER JOIN MyTable t3 ПО t3.date = '2014-01-06' И t3.itemid = 10 И t7.type = 'Двери' ГДЕ t1.itemid = 10 И t1.type = '' Двери

Answer 1

select 
t1.Amount as [Jan 1 Amount], 
t1.Description as [Jan 1 Desc.], 
t2.Amount as [Jan 2 Amount], 
t2.Description as [Jan 2 Desc.], 
t3.Amount as [Jan 3 Amount], 
t3.Description as [Jan 3 Desc.], 
from table t1 
inner join table t2 on t2.date='jan 2' 
inner join table t3 on t3.date='jan 3' 
where t1.date='jan 1' 

Answer 2

Попробуйте использовать PIVOT

select 
[Jan 1Amount], [Jan 1Desc], [Jan 2Amount], 
[Jan 2Desc], [Jan 3Amount], [Jan 3Desc] 
from 
(
    select 
    [date] + column as column, value 
    from Table1 
cross apply 
(
select 'Amount', convert(varchar(20),[Amount]) union all 
select 'Desc', [Description] 
) a (column, value) 
) b 
pivot 
(
max(value) 
for column in ([Jan 1Amount], [Jan 1Desc], [Jan 2Amount], 
      [Jan 2Desc], [Jan 3Amount], [Jan 3Desc]) 
) pi; 

SQL FIDDLE DEMO

Если столбцы неизвестны, то вы можете использовать Dyanmic стержень

DECLARE @cols AS NVARCHAR(MAX), 
@query AS NVARCHAR(MAX) 

select @cols = STUFF((SELECT ',' + QUOTENAME([Date] + ' ' + col) 
       from Table1 
       cross apply 
       (select 'Amount', convert(varchar(20),[Amount]) 
       union all 
       select 'Desc', [Description] 
       ) c (col, so) 
     FOR XML PATH(''), TYPE 
     ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'') 


set @query = 'SELECT ' + @cols + ' 
     from 
     (
      select 
      [date] +'' '' + col as col, value 
      from Table1 
     cross apply 
     (
      select ''Amount'', convert(varchar(20),[Amount]) 
      union all 
      select ''Desc'', [Description] 
     ) c (col, value) 
     ) x 
     pivot 
     (
      max(value) 
      for col in (' + @cols + ') 
     ) p ' 


execute sp_executesql @query; 

SQL FIDDLE DEMO