PostgreSQL排序把null值排在后面

--null值在前
select * from tablename order by id nulls first;


--null值在后
select * from tablename order by id nulls last;


--null在前配合desc使用
select * from tablename order by id desc nulls first;


--null在后配合desc使用
select * from tablename order by id desc nulls last;


举例:
null值在后,先按照count1降序排列,count1相同再按照count2降序排列

order by count1 desc nulls last, count2  desc nulls last;

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