How to work out on these query?

Question

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How to work out on these query?

Posted Date: 16 Jan 2014 Posted By:: Rocky Member Level: Silver Member Rank: 1376 Points: 5 Responses: 0

my table looks like


invoice_no model_ref item_type item_no invoice_qty
tn/0002/13-14 - I 5000350 5
" - K 6000350 10
" 6000350 X 5000242 15
" 6000350 X 5000470 2
MB/0006/13-14 - K 6000370 10
" 6000370 X 5000460 10
" 6000370 X 5000480 1

like i ve lakh of recors in my table

table struct:
+++++++++

create table invoice_item
(
invoice_no varchar(20),
model_ref int,
item_type char(10),
item_no varchar(20),
invoice_qty int
)

insert into invoice_item(invoice_no,model_ref,item_type,item_no,invoice_qty)
values ('tn/0002/13-14','-','I','5000350','5')

' ('tn/0002/13-14','-','K','6000350','10')
' ('tn/0002/13-14','6000350','X','5000242','15')



My EXPECTING O/P:


invoice_no item_no Sales Free

tn/0002/13-14 5000350 5 0
tn/0002/13-14 5000242 10 5
tn/0002/13-14 5000470 0 2
MB/0006/13-14 5000460 10 0
MB/0006/13-14 5000480 0 1


here Item_types "I" directly billed item so it ll reflect free "0" always.
but when we billed along with "K"(kit) highest value takes billed remaining as free(I.E 6000350 kit was billed on tn/0002/13-14 with 10 QTY
actually it contains 5000242 = 15 QTY & 5000470 = 2 QTY
highest values (5000242=15) is less from kit billed. shows like line number 2,3 from my expecting O/P table)


how to do that?