组中的sql查询联接字符串
我有这个桌子结构组中的sql查询联接字符串,sql,sql-server-2000,Sql,Sql Server 2000,我有这个桌子结构 ProjectExpenses Table: -------------------------------------- ProjectName Expense Currency -------------------------------------- Foo 10 USD Foo 20 USD Foo 100 JPY Bar
ProjectExpenses Table:
--------------------------------------
ProjectName Expense Currency
--------------------------------------
Foo 10 USD
Foo 20 USD
Foo 100 JPY
Bar 50 EUR
Bar 25 EUR
我一定要按项目名称分组;我知道那么多,但是我怎么能得到这样的输出呢
--------------------------
ProjectName AllExpenses
--------------------------
Foo 30 USD, 100 JPY
Bar 75 EUR,
我正在寻找一个字符串连接函数,但我不知道从何处开始寻找,甚至不知道仅仅通过sql查询就可以实现类似的功能
非常感谢您提供有关如何解决此问题的任何提示。因为您使用的是SQL Server 2000,这将非常复杂(您需要与Oracle的Listag()函数等效的函数),请参阅
让我们从一个基本查询开始,以获取我们需要的数据:
select ProjectName, Sum(Expense) as Expenses, Currency
from ProjectExpenses
group by ProjectName, Currency
我们可以很容易地为单个项目汇总列表,如下所示:
declare @ProjectExpenses table
(
ProjectName varchar(500),
Expense int,
Currency varchar(500)
)
insert into @ProjectExpenses (ProjectName, Expense, Currency) values ('Foo', 10, 'USD')
insert into @ProjectExpenses (ProjectName, Expense, Currency) values ('Foo', 20, 'USD')
insert into @ProjectExpenses (ProjectName, Expense, Currency) values ('Foo', 100, 'JYP')
insert into @ProjectExpenses (ProjectName, Expense, Currency) values ('Bar', 50, 'EUR')
insert into @ProjectExpenses (ProjectName, Expense, Currency) values ('Bar', 25, 'EUR')
-- do the deed
declare @ProjectExpenseResults table
(
ProjectName varchar(255),
AllExpenses varchar(4000)
);
declare @ProjectName varchar(255);
declare @ExpenseList varchar(4000);
declare c cursor for
select distinct ProjectName
from @ProjectExpenses;
open c;
fetch next from c into @ProjectName;
while @@FETCH_STATUS = 0
begin
set @ExpenseList = null;
select @ExpenseList = ISNULL(@ExpenseList + ', ', '') + CAST(Expenses as varchar(255)) + ' ' + Currency
from (
select Sum(Expense) as Expenses, Currency
from @ProjectExpenses
where ProjectName = @ProjectName
group by Currency
) t;
insert into @ProjectExpenseResults ( ProjectName, AllExpenses )
values (@ProjectName, @ExpenseList);
fetch next from c into @ProjectName;
end
close c;
deallocate c;
select * from @ProjectExpenseResults