插入数据时，我们经常会遇到这样的情况：1、首先判断数据是否存在；2、如果不存在，则插入；3、如果存在，则更新。 在SQL Server中可以这样处理：if not exists (select 1 from t where id = 1)? insert into t(id, update_time) values(1, getdate()) else update t set upda
Merge into @TableName AS T Using #TmpTable AS S ON (T.Type = S.Type) WHEN MATCHED THEN UPDATE SET T.[TypeDesc]=S.[TypeDesc] WHEN NOT MATCHED THEN INSE ...
Doing bulk update and bulk create with Django ORMIt's not unusual the need to do bulk update/create in django applications, but if you don't use the right approach your views will increase the load ti
