关于Oracle数据库统计

1.所用到的函数

（1）CONCAT(a,b)——>拼接字符串

（2）nvl(a,0)——>a为空赋值为空

（3）select tt.rn, tt.*

from(select t.*, rownum rn from tableName t) tt——>记录在数据库中是第几行

（4）to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')——>获取当前年的的1月1号日期格式

（5）sign（a-b）结果值情况：a>b——>1 a<b——>-1 a=b——>0

（6）DECODE(value,if1,then1,if2,then2,if3,then3,...,else),value等于if1,则返回then1，if都不满足则返回else值

（7）select to_char(date,'iw'),sum() 
 from  tablename
 group by to_char(date,'iw') ——>按自然周统计 

（8）select to_char(date,'mm'),sum() 
 from   tablename
 group by to_char(date,'mm') ——>按自然月统计 

（9）select to_char(date,'q'),sum() 
 from  tablename
 group by to_char(date,'q') ——>按自然季统计 

（10）TO_CHAR (to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd')-1 , 'WW')——当年的总周数

（11）FLOOR(date1,date2）——>获得两时间相差天数

（12）mapper的大于和小于号的表示

大于：&gt;    小于：&lt;   大于等于：&gt;=   小于等于：&lt; =

（13）两个不同查询结果合并

select id id,sum(num) num 
from
(select a.STATIONID id,
        count(1) num
        from YPT_CGUESTER a
        group by a.STATIONID
union
select a.STATIONID id,
        count(1) num
        from YPT_EGUESTER a
        group by a.STATIONID
)
group by id
 

select id id,sum(money) money,sum(num) num 
from
(select a.STATIONID id,
		sum(b.MONEY)
		money,
		count(1) num
		from YPT_CGUESTER a
		LEFT JOIN ROOM_MONEY b 
		on (a.STATIONID=b.STATIONID and a.DJ_RUZHUFANGHAO=b.ROOMNUMBER)
		where a.STATIONID= '5101220047'
		group by a.STATIONID
union
select a.STATIONID id,
		sum(b.MONEY)
		money,
		count(1) num
		from YPT_EGUESTER a
		LEFT JOIN ROOM_MONEY b 
		on (a.STATIONID=b.STATIONID and a.F_ROOM=b.ROOMNUMBER)
		where a.STATIONID= '5101220047'
		group by a.STATIONID
)
group by id

2.按当年季，月，周，统计mapper文件如下

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.taxsearch.dao.StatisticsMapper">
	
	<!-- 查询季收入 -->
	<select id="selectSeason" resultType="HashMap"> 
		select CONCAT(tt.rn,'季') season,nvl(z.season_money,0) season_money
		from(select t.*, rownum rn from YPT_CGUESTER t) tt
		LEFT JOIN
		(select to_char(DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN),'q') season,
		sum((DECODE(FLOOR(DECODE(a.DJ_TUIFANGSHIJIAN,null,to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01'), 'yyyy-mm-dd'),a.DJ_TUIFANGSHIJIAN)
		-DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN))
		,0,1,FLOOR(DECODE(a.DJ_TUIFANGSHIJIAN,null,to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01'), 'yyyy-mm-dd'),a.DJ_TUIFANGSHIJIAN)
		-DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN))))*b.MONEY)
		season_money
		from YPT_CGUESTER a
		LEFT JOIN ROOM_MONEY b 
		on (a.DJ_LVGUANDAIMA=b.STATIONID and a.DJ_RUZHUFANGHAO=b.ROOMNUMBER)
		where a.DJ_LVGUANDAIMA= #{DJ_LVGUANDAIMA,jdbcType=VARCHAR}
		and ((a.DJ_RUZHUSHIJIAN&gt;=to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01') , 'yyyy-mm-dd') 
		and a.DJ_RUZHUSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd'))
		or (a.DJ_RUZHUSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd') and a.DJ_TUIFANGSHIJIAN is null))
		or (a.DJ_RUZHUSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd') and a.DJ_TUIFANGSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd'))
		group by to_char(DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN),'q') 
		ORDER BY season) z
		on tt.rn=z.season
		where tt.rn&lt;=4
	</select>
	
	<!-- 查询月收入 -->
	<select id="selectMonth" resultType="HashMap"> 
		select CONCAT(tt.rn,'月') month,nvl(z.month_money,0) month_money
		from(select t.*, rownum rn from YPT_CGUESTER t) tt
		LEFT JOIN
		(select to_char(DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN),'mm') month,
		sum((DECODE(FLOOR(DECODE(a.DJ_TUIFANGSHIJIAN,null,to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01'), 'yyyy-mm-dd'),a.DJ_TUIFANGSHIJIAN)
		-DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN))
		,0,1,FLOOR(DECODE(a.DJ_TUIFANGSHIJIAN,null,to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01'), 'yyyy-mm-dd'),a.DJ_TUIFANGSHIJIAN)
		-DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN))))*b.MONEY)
		month_money
		from YPT_CGUESTER a
		LEFT JOIN ROOM_MONEY b 
		on (a.DJ_LVGUANDAIMA=b.STATIONID and a.DJ_RUZHUFANGHAO=b.ROOMNUMBER)
		where a.DJ_LVGUANDAIMA= #{DJ_LVGUANDAIMA,jdbcType=VARCHAR}
		and ((a.DJ_RUZHUSHIJIAN&gt;=to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01') , 'yyyy-mm-dd') 
		and a.DJ_RUZHUSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd'))
		or (a.DJ_RUZHUSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd') and a.DJ_TUIFANGSHIJIAN is null))
		or (a.DJ_RUZHUSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd') and a.DJ_TUIFANGSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd'))
		group by to_char(DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN),'mm') 
		ORDER BY month) z
		on tt.rn=z.month
		where tt.rn&lt;=12
	</select>
	
	<!-- 查询周收入 -->
	<select id="selectWeek" resultType="HashMap"> 
		select CONCAT(tt.rn,'周') week,nvl(z.week_money,0) week_money
		from(select t.*, rownum rn, TO_CHAR (to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd')-1 , 'WW') total from YPT_CGUESTER t) tt
		LEFT JOIN
		(select to_char(DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN),'iw') week,
		sum((DECODE(FLOOR(DECODE(a.DJ_TUIFANGSHIJIAN,null,to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01'), 'yyyy-mm-dd'),a.DJ_TUIFANGSHIJIAN)
		-DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN))
		,0,1,FLOOR(DECODE(a.DJ_TUIFANGSHIJIAN,null,to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01'), 'yyyy-mm-dd'),a.DJ_TUIFANGSHIJIAN)
		-DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN))))*b.MONEY)
		week_money
		from YPT_CGUESTER a
		LEFT JOIN ROOM_MONEY b 
		on (a.DJ_LVGUANDAIMA=b.STATIONID and a.DJ_RUZHUFANGHAO=b.ROOMNUMBER)
		where a.DJ_LVGUANDAIMA= #{DJ_LVGUANDAIMA,jdbcType=VARCHAR}
		and ((a.DJ_RUZHUSHIJIAN&gt;=to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01') , 'yyyy-mm-dd') 
		and a.DJ_RUZHUSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd'))
		or (a.DJ_RUZHUSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd') and a.DJ_TUIFANGSHIJIAN is null))
		or (a.DJ_RUZHUSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd') and a.DJ_TUIFANGSHIJIAN&lt;to_date(CONCAT(to_char(sysdate,'yyyy')+1,'-01-01') , 'yyyy-mm-dd'))
		group by to_char(DECODE(sign(to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd')-a.DJ_RUZHUSHIJIAN),1,to_date(CONCAT(to_char(sysdate,'yyyy'),'-01-01'), 'yyyy-mm-dd'),a.DJ_RUZHUSHIJIAN),'iw') 
		ORDER BY week) z
		on tt.rn=z.week
		where tt.rn&lt;=tt.total
	</select>
	
</mapper>

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