[英]How to get table-like query result on SQL Server 2005/8?
我有3张桌子:
users (id, name)
currency (id, name)
accounts (id, user_id, currency_id, amount)
我想从accounts
读取数据并以表格形式显示:
owner currency1 currency2 currency3
1 0 0 0
2 10 20 30
3 0 5 10
其中owner
是ID
的accounts.owner
, currency1,2,3
- (SELECT id FROM currency WHERE name = '1',etc)
我只能针对一个特定的ID获得这样的结果:
SELECT
SELECT amount FROM accounts WHERE currency = (SELECT id FROM currency WHERE name = 'currency1') AND owner = @user) AS [currency1],
SELECT amount FROM accounts WHERE currency = (SELECT id FROM currency WHERE name = 'currency2') AND owner = @user) AS [currency2],
SELECT amount FROM accounts WHERE currency = (SELECT id FROM currency WHERE name = 'currency2') AND owner = @user) AS [currency2]
users
表中的每个对象都能获得相同的结果吗? 不使用重订服务等
听起来好像您想要数据透视表。 如果您使用不同数量的货币行,将很难做到,但是仍然可以通过使用动态编写的sql来完成。
这是MSDN的资源,解释了如何使用数据透视表: http : //msdn.microsoft.com/zh-cn/library/ms177410.aspx
SELECT u.name, [1] AS Currency1, [2] AS Currency2, [3] AS Currency3
FROM
(SELECT u.Name AS UserName, c.Currency_ID, a.Amount
FROM Accounts AS a WITH(NOLOCK)
JOIN Users u WITH(NOLOCK) ON a.user_id = u.user_id
) p
PIVOT
(
SUM (p.Amount)
FOR p.Currency_id IN
( [1], [2], [3] )
) AS pvt
ORDER BY pvt.UserName
使用数据透视表和动态SQL检索列
DECLARE @columns VARCHAR(2000)
SELECT @columns = STUFF(( SELECT DISTINCT TOP 100 PERCENT
'],[' + c.name
FROM currency AS c
ORDER BY '],[' + c.name
FOR XML PATH('')
), 1, 2, '') + ']'
DECLARE @query NVARCHAR(4000)
SET @query = N'SELECT UserName, ' + @columns +
'FROM
(SELECT u.Name AS UserName, c.name AS CurrencyName, a.Amount
FROM Accounts AS a WITH(NOLOCK)
JOIN Users u WITH(NOLOCK) ON a.user_id = u.user_id
JOIN Currency c WITH(NOLOCK) ON a.currency_id = c.currency_id
) p
PIVOT
(
SUM (p.Amount)
FOR p.CurrencyName IN
( '+ @columns +')
) AS pvt
ORDER BY UserName'
EXECUTE(@query)
这已在SQL Server 2005中进行了测试
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