) SET @center_JZHW = ( SELECT DISTINCT STUFF( ( SELECT ','''+ qudao+'''' FROM CreatedType WITH ( NOLOCK ) WHERE qtype = 'pc' ORDER BY qudao ,, '') AS jzhw FROM CreatedType t) ) select @center_JZHW
mysql中添加一个和root一样的用户用于远程连接: 大家在拿站时应该碰到过.root用户的mysql,只可以本地连,对外拒绝连接. 下面语句添加一个新用户administrtor: CREATE USER 'monitor'@'%' IDENTIFIED BY 'admin'; MAX_CONNECTIONS_PER_HOUR MAX_UPDATES_PER_HOUR MAX_USER_CONNECTIONS ; 删除这个用户: DROP USER 'monitor'@'%'; DROP D
为什么看Python的代码,有时候会在数据结构的最后一项末尾加上逗号.直接来看,这个逗号很多余. 根据PEP81的解释: Trailing commas are usually optional, except they are mandatory when making a tuple of one element 这里说末尾逗号不是必填的,除非你写了一个只有一个元素的元祖. 所以这么多人写的代码风格都是多余的? 不是的.PEP8在上面一句的后来接着写道,末尾的代码可以帮助减少bug: 比如多
A. Minimum Difficulty time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mike is trying rock climbing but he is awful at it. There are n holds on the wall, i-th hold is at height ai off the g