Oracle语句删除和建立外键约束

现在有两个表，主表 QUERY_CONFIG ,字表 QUERY_TERM_INFO

1. 为字表建立外键约束 

alter table QUERY_TERM_INFO   add constraint FK_QUERYTERMINFO_0 foreign key (QUERY_ID)

  references QUERY_CONFIG (QUERY_ID);

2. 删除外键约束

alter table QUERY_TERM_INFO  drop constraint FK_QUERYTERMINFO_0;