[英]SQL Auto Increment a value with multiple inserts
We have a SQL query being executed against a SQL Server 2008 DB. 我们有一个针对SQL Server 2008数据库执行的SQL查询。
INSERT INTO ListDetail(ListID, Sequence, CompName, CompAddress, Date)
(
SELECT
12345 AS 'ListID',
(MAX(ListDetail.Sequence) + 1) AUTO_INCREMENT as 'Sequence',
Company.Name AS 'CompName',
Company.Address AS 'CompAddress',
GETDATE() AS 'Date'
FROM Company
WHERE CompanyType = 3
)
We want to find the max Sequence from ListDetail table.. and select records from the Company table into ListDetail. 我们要从ListDetail表中找到最大序列。然后从Company表中选择记录到ListDetail中。 But, we want to start with the next available Sequence value from ListDetail and then increment by 1 for each record inserted.
但是,我们要从ListDetail中的下一个可用Sequence值开始,然后为插入的每个记录加1。 The Sequence field in ListDetail is just a general INT field.
ListDetail中的Sequence字段只是常规的INT字段。
We do not have control over the database its-self... so created a new table or altering the existing one is not an option. 我们无法控制数据库本身...因此无法创建新表或更改现有表。
One option would be to use Row_Number()
with a subquery that returns the max()
: 一种选择是将
Row_Number()
与返回max()
的子查询一起使用:
Simplified solution: 简化解决方案:
insert into ListDetail
select 12345, sq+row_number() over (order by (select null))
from company, (select max(sequence) sq from listdetail) t
INSERT INTO ListDetail(ListID, Sequence, CompName, CompAddress, Date)
SELECT
12345,
sq+row_number() over (order by (select null)),
Name,
Address,
GETDATE()
FROM Company, (select max(sequence) sq from listdetail) t
WHERE CompanyType = 3
A simple approach like this should work for you. 这样的简单方法应该适合您。
INSERT INTO ListDetail(ListID, Sequence, CompName, CompAddress, Date)
(
SELECT
12345,
(SELECT MAX(Sequence) + 1 FROM ListDetail),
Company.Name,
Company.Address,
GETDATE()
FROM Company
WHERE CompanyType = 3
)
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