Postgresql 字符串操作

【拆分】类似split

split_part(字段,‘字符’,下标)

select split_part(house_full_number,'-',1),house_full_number from layout_house

select split_part(house_full_number,'-',2),house_full_number from layout_house

select split_part(house_full_number,'-',3),house_full_number from layout_house

【字符串转数字】

to_number(‘字段’,‘999999999’)

select door_num from resident_information

select door_num from resident_information order by to_number(split_part(door_num,'-',1),'999999'),to_number(split_part(door_num,'-',2),'999999') asc