MySQL修改语句如何让某一字段下以逗号分隔的数字都补齐三位答:create table t(str varchar(100));insert into t values ('0,1,2,34');执行:SELECTgroup_concat(RIGHT (concat('00',substring_index(substring_index(a.str,',',b.help_topic_id + 1),',' ,- 1)),3))FROMt aJOIN mysql.help_topic b ON b.help_topic_id < (length(a.str)...