Question

我有一个表已经填充了5000行表。

我有一个名为SEQN的专栏。

我想用行计数填充此列。

我正在使用：

Microsoft SQL Server Management Studio 9.00.4035.00 Microsoft Analysis Services客户端工具2005.090.4035.00 Microsoft数据访问组件（MDAC）6.1.7601.17514 Microsoft MSXML 3.0 4.0 5.0 6.0 Microsoft Internet Explorer 9.0.8112.16421 Microsoft .NET Framework 2.0.50727.5466 操作系统6.1.7601

先谢谢您的帮助。

SQLNewbie

Answer 1

declare @Foo as Table ( FooId Int Identity, Sequence Int, Timestamp DateTime );
insert into @Foo ( Sequence, Timestamp ) values
  ( 42, '20010203 10:18:05' ), ( 18, '20100508 22:18:05' ), ( NULL, '19960316 19:00:00' );

select * from @Foo order by Sequence;

update Foo
  set Sequence = S
  from ( select Sequence, Row_Number() over ( order by Timestamp ) as S from @Foo ) as Foo;

select * from @Foo order by Sequence;

update Foo
  set Sequence = S
  from ( select Sequence, Row_Number() over ( order by Timestamp desc ) as S from @Foo ) as Foo;

select * from @Foo order by Sequence;

如何在已有记录的表上创建行计数？

1 个答案: