Currently, ApsaraDB for RDS for MySQL may return inaccurate query results because the decimal field is too large. This is a bug of MySQL.
The problem can be solved by adding indexes. Refer to the following solution for SQL:
create table mlgtestdecimal(`campaign_id` decimal(24,0) NOT NULL, name VARCHAR(50))
insert into mlgtestdecimal(campaign_id,name) VALUES('2016000000000000000088','1111111111');
insert into mlgtestdecimal(campaign_id,name) VALUES('2016000000000000000520','1111111111');
SELECT * from mlgtestdecimal where campaign_id='2016000000000000000088'and name='1111111111'
alter table mlgtestdecimal add index ind_decimal (`campaign_id`);
If the problem persists, contact Alibaba Cloud After-Sales Technical Support.