SQL更新记录,每次递增值从1开始 [英] SQL update records with incrementing value starting from 1 each time
问题描述
我正在使用单个插入语句将一批记录添加到表中.我希望为每个新批次分配递增的数字,但每次都从1开始.
I am adding batches of records to a table using a single insert statement. I want each new batch to be allocated incrementing numbers, but starting from 1 each time.
所以,如果我有
Batch Name IncementingValue
1 Joe 1
1 Pete 2
1 Andy 3
2 Sue 1
2 Mike 2
2 Steve 3
然后我添加两条记录(使用单个插入语句):
and I then add two records (using a single insert statement) :
3 Dave
3 Paul
如何针对此表运行更新语句,以使Dave设置为1,Paul设置为2.我不想使用游标.
How can I run an update statement against this table so that Dave will be set to 1 and Paul to 2. I don't want to use a cursor.
推荐答案
排名函数ROW_NUMBER
应该可以满足您的需求.您没有提及有关如何分配序列号的任何特定规则,因此我在这里使用名称来完成此操作:
The ranking function ROW_NUMBER
should do what you need. You didn't mention any specific rules about how the sequence number should be allocated, so I've done it here using the name:
INSERT targetTable(Batch,Name,IncementingValue)
SELECT BatchId,
Name,
ROW_NUMBER() OVER (ORDER BY Name)
FROM sourceTable
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