符号 || 在oracle中是连接符号，可以将两个字段的值连接在一起

举例

有一组数据

create table accu
(
    day_code varchar2(10),
    buss_month varchar2(10),
    fnum int
)
insert into accu values('20210927','202109',1);
insert into accu values('20210928','202110',2);
insert into accu values('20210927','202109',2);
insert into accu values('20210929','202110',3);
insert into accu values('20210930','202110',4);
insert into accu values('20211001','202110',5);

oracle连接符_字段

 

测试连接符

select buss_month||'卖出'||sum(fnum)||'个' text
from accu
group by buss_month

结果

oracle连接符_数据_02