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Error 1046 No database Selected, how to resolve?

... You need to tell MySQL which database to use: USE database_name; before you create a table. In case the database does not exist, you need to create it as: CREATE DATABASE database_name; followed by: USE database_name; ...
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那些曾被追捧的90后创业男神女神,还好吗? - 资讯 - 清泛网 - 专注C/C++及内核技术

...右,距离1%还差不少。但不晓得安妮以及她的团队今后会如何去做,或许这样让人眼前一亮的作品再次出现要等很久,但我们却不得不承认,这次的1%亮了。 点评:鸡汤是这个时代最好的精神补品,但此前以漫画形式成功的案例...
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Using column alias in WHERE clause of MySQL query produces an error

...is executed, the column value may not yet be determined. Copied from MySQL documentation As pointed in the comments, using HAVING instead may do the work. Make sure to give a read at this WHERE vs HAVING though. share...
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从Sloodle看三维虚拟学习环境的发展趋势 - 资讯 - 清泛网 - 专注C/C++及内核技术

...游戏 ,吸引了越来越多的关注。现在的教育者也开始探索如何让学生在学习时也能像玩游戏一样沉浸其中。在游戏中需要解决一些交流、协作问题 ,这在学习系统中也会同样关注 ,因此很多学者也开始研究非正式学习领域内如何将...
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What MySQL data type should be used for Latitude/Longitude with 8 decimal places?

... DECIMAL is the MySQL data-type for exact arithmetic. Unlike FLOAT its precision is fixed for any size of number, so by using it instead of FLOAT you might avoid precision errors when doing some calculations. If you were just storing and ret...
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OnInitUpdate、OnUpdate、OnDraw与OnPaint - C/C++ - 清泛网 - 专注C/C++及内核技术

...情况下可能需要和框架直接发生作用,而在多视的情况下如何在视之间传递数据。 在使用菜单时大家会发现当一个菜单没有进行映射处理时为禁止状态,在多视的情况下菜单的状态和处理映射是和当前活动视相联系的,这...
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Does MySQL foreign_key_checks affect the entire database?

When I execute this command in MySQL: 6 Answers 6 ...
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Are duplicate keys allowed in the definition of binary search trees?

...a BST which allows either of the right or left children to be equal to the root node, will require extra computational steps to finish a search where duplicate nodes are allowed. It is best to utilize a list at the node to store duplicates, as inserting an '=' value to one side of a node requires r...
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那些微信公众大号是如何赚钱的? - 资讯 - 清泛网 - 专注C/C++及内核技术

那些微信公众大号是如何赚钱的?如今,微信公众号不仅是传递好文的平台,承载着万千运营者的兴趣和梦想,而且当粉丝量和文章阅读量高涨之后,随之而来的还有丰厚的经济效益。“你开公众号了吗?”不知从何时起,这个...
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Discuz! X3 论坛标题字数突破80的限制 - 更多技术 - 清泛网 - 专注C/C++及内核技术

... _forum_rsscache, _forum_thread 这三张表): 下面详细介绍如何修改: 一、数据库修改,修改数据库标题字段的长度为255字符:运行下面的sql语句: (注意修改你的表的前缀,还有修改前一定要备份!!!) ALTER TABLE `pre_forum...