Sqlserver 列转行

列转行

--方法1：使用pivot
CREATE table #yourtable
    ([Id] int, [Value] varchar(6), [ColumnName] varchar(13))
;
INSERT INTO #yourtable
    ([Id], [Value], [ColumnName])
VALUES
    (1, 'John', 'FirstName'),
    (2, '2.4', 'Amount'),
    (3, 'ZH1E4A', 'PostalCode'),
    (4, 'Fork', 'LastName'),
    (5, '857685', 'AccountNumber')
;
select *
from
(
  select value, columnname
  from #yourtable
) d
pivot
(
  max(value)
  for columnname in (Firstname, Amount, PostalCode, LastName)
) piv;
--方法2：使用left join 
select fn.value as FirstName,
  a.value as Amount,
  pc.value as PostalCode,
  ln.value as LastName,
  an.value as AccountNumber
from yourtable fn
left join yourtable a
  on fn.somecol = a.somecol
  and a.columnname = 'Amount'
left join yourtable pc
  on fn.somecol = pc.somecol
  and pc.columnname = 'PostalCode'
left join yourtable ln
  on fn.somecol = ln.somecol
  and ln.columnname = 'LastName'
left join yourtable an
  on fn.somecol = an.somecol
  and an.columnname = 'AccountNumber'
where fn.columnname = 'Firstname'

参考

Efficiently convert rows to columns in sql server