我必须根据三列的不同组合将记录插入到另一个表中。表A有50列,因为我必须将三列的不同值插入到另一个表中。我怎么能做到这一点?我试着在下面做,但得到了错误。 select * from engagementmasterstaging in (select distinct EngagementId,ServiceLine,SubServiceLine
from engagementmasterstaging)
很快,运行rails g migration En Em将为我提供一个迁移文件def change t.index#failsActiveRecord::UnknownPrimaryKey: Unknown primary key for table ems_ens in model En::HABTM_Ems: ERROR: column "en_id" does not exist
LINE 1: ...C
我是说ContainerEvents ems = new ContainerEvents();Exam ob2 = new Exam(1);FExam ob3 = new FExam(1);ems.Setplus = new Super(ob1.Write);ems.Setplus = new Super(ob3.Write);