sql server - How to update column of a table after group by with condition in SQL? -


i new user of sql c#. i'm faced problem, have sql table column these are:

id, receiptno, modelname, size, quantity, priceperunit, totalprice.

after group size column want update 'quantity' column condition.

condition is, want decrease/minus/less/update 'quantity' row after row. when 'quantity' '0' jump next row & find quantity & decrease this.

here data:

|id | |receiptno| |modelname| |size| |quantity| |priceperunit| |totalprice| --------------------------------------------------------------------------- |1|   |001|       |abcd|      |xxl|  |0|        |120|          |0|   |2|   |002|       |abcd|      |xxl|  |6|        |120|          |720|  |3|   |003|       |abcd|      |xxl|  |7|        |120|          |840|  |4|   |004|       |appp|      |xl |  |2|        |60 |          |120|

i want decrease first 3 rows '8' quantities using group size column. how that?

you should able :

update your_table set quantity = quantity - 1  quantity <>0 , size = 'xxl'  , id  = (select top 1 id your_table quantity =      (select min(quantity) your_table size='xxl') )

it decrease quantity first line of size 'xxl' quantity minimum.

this decrease one. might able call 8 time :)

i haven't test request. may need adjustment.


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