oracle统计无记录时写默认值

欢迎进入Oracle社区论坛，与200万技术人员互动交流 >>进入 oracle统计无记录时写默认值 select nvl(max(t1.packagesize),0) from ( select decode(count(t.per_bus_code),0,'1') per_bus_code,decode(count(t.buss_code),0,'1') buss_code,decode(count(t.pe

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oracle统计无记录时写默认值

select nvl(max(t1.packagesize),0)

from (

select decode(count(t.per_bus_code),0,'1') per_bus_code,decode(count(t.buss_code),0,'1') buss_code,decode(count(t.per_code),0,'1') per_code

from t_tybook_back_pers_business t

where t.per_code = 'TY-00000106'

and t.end_date > sysdate

and t.start_date<=sysdate ) t

left join t_tybook_before_business t1 on t.buss_code = t1.code

group by t.per_code;