[英]How do I add Auto-increment value in SQL Server
I need to generate 7 digit code (Alternate ID) for my existing customers.我需要为现有客户生成7 位代码(备用 ID)。 For example.例如。 This my existing Customer Table structure这是我现有的客户表结构
ID Name Address City AlternateID
101 Test1 NO 4,.. LA 0000001
102 Test2 NO 3,.. TA 0000002
We have to run this script on a daily basis.我们必须每天运行这个脚本。 Last number stored in a different table.最后一个数字存储在不同的表中。 Next day start from the Last number stored in Table.第二天从存储在表中的最后一个数字开始。
(Ex. 1st day added 30 customers means "0000030"
2nd day added 10 customers means "0000040")
I want to know the query on how to decrease "0" when digits of the number increased我想知道当数字增加时如何减少“0”的查询
Like - Single-Digit number "0000001"
- Double-Digit number "0000010"
- Triple-Digit number "0000100"
so on.很快。
You can do:你可以做:
select t.*,
right(concat('0000000', row_number() over (order by id)), 7) as AlternateID
from table t;
You can use:您可以使用:
update t
set alternateid = format(row_number() over (order by id) + ot.max_alternateid, '0000000')
from t cross join
othertable ot
where alternateid is null;
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