sql server - T SQL to join record dynamically -


can me out following scenario. using sql server 2008r2. need sql server query expected result. here tried do:

declare @projectinvoice table(invoiceid int, projectid int, invoiceamount float) declare @projectbudget table(projectbudgetid int, projectid int, budgetamount float) insert @projectbudget values(11,1,100000),(12,1,50000) insert @projectinvoice values (12345,1,25000) ,(12346,1, 30000)  ,(12347,1, 40000)  ,(12348,1, 30000) ,(12349,1, 10000)  select * @projectbudget select * @projectinvoice

expected result:

-- expected result --invoiceid projectid invoiceamount projectbudgetid bugetamountleft  --  12345   1           25k         11              75k  -- > 100k(original budget) - 25k    --  12346   1           30k         11              45k --> 75k( budget amount left after first invoice) - 30k --  12347   1           40k         11              5k  --> 45k - 40k --  12348   1           5k          11              0k  --> 5k left budget, whereas have 30k deduct, deduct 5k projectbudget11  --  12348   1           25k         12              25k --> , rest 25k project budget 12 --  12349   1           10k         12              15k 

select p.invoiceid, p.projectid, p.invoiceamount, sm.projectbudgetid,  sm.budgetamount - sm.amt runningtot @projectinvoice p inner join (select i.invoiceid, b.projectbudgetid, b.budgetamount,         sum(i.invoiceamount) on (partition b.projectbudgetid order      i.invoiceid) amt @projectbudget b inner join @projectinvoice on b.projectid = i.projectid) sm on p.invoiceid = sm.invoiceid

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