SQL更新记录，每次递增值从1开始

本文介绍了SQL更新记录，每次递增值从1开始的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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