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studentName varchar on Muck Rack

studentName varchar

As seen in: CSDN
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MySQL所有基本操作详解_baixian110的博客-CSDN博客

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By Query OK, Database changed, classId int, studentName varchar
| CSDN
首先sql操作中的关键字的是大小写不敏感的，create 和CREATE是一样的。 1.库操作 1. 1查看数据库 show databases; show 和databases 之间有一个或者多个空格 注意是databases而不是database 结尾分号是英文形式，分号在SQL中是表示一行执行+ 代码的，如果语句后面么有分号，那么默认是要一句代码分多行来写（如下图） 下图中是每次执行完一个sql语句之后，会得到的一个反馈，反馈会告诉我们，当前结果有多少行记录，以及消耗了多少时间。在下图中set表示集合，所以意思就是在当前集合里有四行，执行共花费0.01秒（sec = second 秒）。有时会显示0.00 sec.,这表示小于10毫秒，所以不显示。 1.
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