alter table AdventureWorks2019.sales.SalesOrderDetail add IsValid bit not null constraint IsValid_Default_Constraint Default 1 with values;
This will make a sense when you want to delete logically instead of delete physically.
For example physically deletion.
delete from tableName where id=conditionValue;
While the logically deletion will be more elegant and easy to roll back or restore/undo.
update tableName set IsValid=0 where id=conditionValue
and when you retrieve valid result just add where condition to filter as below
select * from tableName where IsValid=1;
原文链接: https://www.cnblogs.com/Fred1987/p/14083297.html
欢迎关注
微信关注下方公众号,第一时间获取干货硬货;公众号内回复【pdf】免费获取数百本计算机经典书籍;
也有高质量的技术群,里面有嵌入式、搜广推等BAT大佬
原创文章受到原创版权保护。转载请注明出处:https://www.ccppcoding.com/archives/401885
非原创文章文中已经注明原地址,如有侵权,联系删除
关注公众号【高性能架构探索】,第一时间获取最新文章
转载文章受原作者版权保护。转载请注明原作者出处!