創建銷售表：店鋪銷售表s1和電商銷售表s2
create table s1 (id int, cp char(10), jg int, time date);
create table s2 (id int, cp char(10), jg int, time date);
commit;
表中添加數據
S1中數據
insert into s1 values (1,'shouji',2800,to_date('2012-12-12 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s1 values (2,'dianshi',15800,to_date('2012-12-10 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s1 values (3,'shouji',2800,to_date('2012-12-8 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s1 values (4,'bingxiang',8800,to_date('2012-11-12 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s1 values (5,'kongtiao',12800,to_date('2012-12-3 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s1 values (6,'dianshi',15800,to_date('2012-11-11 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s1 values (7,'shouji',2800,to_date('2012-11-10 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s1 values (8,'kongtiao',12800,to_date('2012-11-3 12:12:12','yyyy-mm-dd hh24:mi:ss'));
S2中數據
insert into s2 values (1,'shouji',2600,to_date('2012-12-12 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s2 values (2,'dianshi',15200,to_date('2012-12-10 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s2 values (3,'shouji',2600,to_date('2012-12-8 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s2 values (4,'bingxiang',8000,to_date('2012-11-12 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s2 values (6,'dianshi',15200,to_date('2012-11-11 12:12:12','yyyy-mm-dd hh24:mi:ss'));
insert into s2 values (7,'shouji',2600,to_date('2012-11-10 12:12:12','yyyy-mm-dd hh24:mi:ss'));
commit;
查看錶中數據
select * from s1;
select * from s2;
分別統計數據表s1、s2 11月和12月份的銷售額
select sum(jg) as heji12s1 from s1 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-12' ;
select sum(jg) as heji12s2 from s2 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-12';
select sum(jg) as heji11s1 from s1 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-11';
select sum(jg) as heji11s2 from s2 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-11';
11月和12月銷售額分別求和
select (select sum(jg) as heji12s1 from s1 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-12')
+(select sum(jg) as heji12s2 from s2 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-12') as heji12
from dual;
select (select sum(jg) as heji11s1 from s1 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-11')
+(select sum(jg) as heji11s2 from s2 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-11')
as heji11 from dual;
對比12月和11月銷售額
select ((select sum(jg) as heji12s1 from s1 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-12')
+(select sum(jg) as heji12s2 from s2 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-12') )
- ((select sum(jg) as heji11s1 from s1 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-11')
+(select sum(jg) as heji11s2 from s2 where substr(to_char(time,'yyyy-mm-dd'),1,7)='2012-11'))
as xiaoshoucha from dual;
總結：
11月份銷售總額爲：66000元
12月份銷售總額爲：54600元
12月份銷售量有所下降，與11月份對比，銷售額下降了11400元。