sql生成行号

sql生成行号

 

sqlsql：

不分组行号：

select ROW_NUMBER() over ( order by 订单编号) from test

分组行号：

select ROW_NUMBER() over (partition by 订单编号 order by 订单编号) from test

 

mysql：

不分组行号：

SELECT

@r:=@r+1 AS rouNum,

a.* FROM s_t1 a,(SELECT @r:=0) b

 

oracle：

不分组行号：

 SELECT *, Row_Number() OVER (ORDER BY salary desc) rank FROM employee

分组行号：

 SELECT *, Row_Number() OVER (partition by deptid ORDER BY salary desc) rank FROM employee