oracle添加序号列大全(3种方法)-编程知识

oracle添加序号列大全(3种方法)

场景：oracle在展示数据时，用户需要看到当前记录数，添加序号即可，适用于表格导出。
方式一：添加xh字段

SELECTfxh,fmc,round( ( sum( fczsrbnljzxs ) - sum( fczsrsntqs ) ) / 10000, 2 ) AS 增减额,round( sum( fczsrbnljzxs ) / 10000, 2 ) AS 财政收入,round( sum( fczsrbsn ), 2 ) AS 增减幅度,f_sys_year 
FROMzhzs_bill_qqczsrfjwcqk 
WHEREf_sys_year = '2021' AND f_sys_month = '12' 
GROUP BYfxh,fmc,f_sys_year 
ORDER BYto_number( fxh )

效果图：
在这里插入图片描述
SQL解读：此条在select后添加xh，group by后添加xh分组，以及用order by排序，to_number(xh)将其转为数值型即可

方式二：oracle自带

select ROWNUM as fxh,a.* from (
SELECT  fmc, round((sum(fczsrbnljzxs) - sum(fczsrsntqs)) / 10000, 2) AS 增减额, round(sum(fczsrbnljzxs) / 10000, 2) AS 财政收入, round(sum(fczsrbsn), 2) AS 增减幅度, f_sys_year
FROM zhzs_bill_qqczsrfjwcqk
WHERE f_sys_year = '2021'AND f_sys_month = '12'
GROUP BY fmc, f_sys_year ) a

效果图
在这里插入图片描述
SQL解读：此方法使用自带的ROWNUM函数，简单方便，oracle独有

方式三：row_number()函数

SELECT  row_number() over(order by fmc) as xh,fmc, round((sum(fczsrbnljzxs) - sum(fczsrsntqs)) / 10000, 2) AS 增减额, round(sum(fczsrbnljzxs) / 10000, 2) AS 财政收入, round(sum(fczsrbsn), 2) AS 增减幅度, f_sys_year
FROM zhzs_bill_qqczsrfjwcqk
WHERE f_sys_year = '2021'AND f_sys_month = '12'
GROUP BY fmc, f_sys_year