Para 1： when it comes to …, some people think(argue, claim, maintain, hold, believe, say, regard) that A is more important than B. It goes without saying that A plays an important part in… The reasons are as follows. Firstly, (To begin with, first o
Although it is based on C++, Java is more of a “pure” object-oriented language. Both C++ and Java are hybrid languages, but in Java the designers felt that the hybridization was not as important as it was in C++. A hybrid language allows multiple pr
1．掌握相关。 2．体会各种查询的异同及相互之间的转换，体会各种查询的执行过程，为综合应用打下良好的基础。 ● 查询没有选修指定课程号的学生的学号、姓名、性别、出生日期和级别。课程号由局部变量提供。 declare @Cno char(6); set @Cno='a00002'; select sno as 学号,sname as 姓名,sex as 性别,birthday as 生日,enter_year as 级别 from Student where sno not in(select
我们在写SQL时候，往往会需要格式化或多表联合查询，现在来一个实例看看这个问题
SELECT t.id, t.topic_title AS title,
IF(sch.is_true='1','答案正确','答案错误') as answer,
DATE_FORMAT(sch.create_time, '%Y-%m-%d %H:%i:%s') as createtime
FROM topic t
LEFT JOIN student_commit_history sch
on t.id = sch.
