[英]Oracle SQL Update by rownum
I have the data in the following format: 我有以下格式的数据:
ORD_NO ITEM FULFILL_ID
SA1 1000 1
SA1 2000 2
SA2 2000 1
SA2 3000 2
SA2 9000 3
I want to fill in the values for the column FULFILL_ID, which should start with 1 and increase till the number of rows for one particular ORD NO, as I have filled above. 我想填写FULFILL_ID列的值,该值应从1开始并增加,直到一个特定的ORD NO的行数为止,就像我在上面填写的那样。
How to do it ? 怎么做 ?
This is what ROW_NUMBER()
does: 这是
ROW_NUMBER()
作用:
select ord_no, item,
row_number() over (partition by ord_no order by item) as fulfill_id
from table t;
This returns the value as a query. 这将返回值作为查询。 A slightly different query is needed for an update.
更新需要一个稍有不同的查询。
EDIT: 编辑:
The update can be done like this: 更新可以像这样完成:
update table t
set fulfill_id = (select count(*)
from table t2
where t2.ord_no = t.order_no and
t2.item <= t.item
);
This version assumes that item
is different for the same values of ord_no
. 此版本假定
item
是相同的值不同ord_no
。
you can use merge statement for this 您可以为此使用合并语句
merge into table1 t3 using
(
select ord_no, item,
row_number() over (partition by ord_no order by item) as fulfill_id
from table1
) s
on
(t3.ORD_NO=s.ORD_NO and t3.ITEM=s.ITEM)
when matched then
update set t3.FULFILL_ID=s.fulfill_id
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