oracle添加序号列大全(3种方法)_oracle 序号

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

SELECT
	fxh,
	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
	fxh,
	fmc,
	f_sys_year 
ORDER BY
	to_number( fxh )
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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 
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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
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SQL解读：此方法通用(mysql也可以使用)

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