去掉字符串左邊或右邊指定的字符

使用trim函數。

一、刪除左邊的‘0’

select trim(leading '0' from col_name);

二、刪除右邊的‘0’

select trim(trailing '0' from col_name);

三、刪除先後的‘0’

select trim(both '0' from col_name);