Course Introduction to SQL BeginnerSkill Level 2hours 147K Learn how to create and query relational databases using SQL in just two hours. Course Intermediate SQL BeginnerSkill Level 4hours 39.3K Accompanied at every step with hands-on practice queries, this course teaches you everything you need...
This is a 4-course beginner level program and is an excellent fit for those who want to learn to query big data with modern distributed SQL engines, whether or not they have any experience in SQL. The SQL SELECT statement and its main clauses are discussed in detail in one of the cour...
select * from course where student_id in(1,2,3) Exists子查询用于判定是否是空集合 Exists子查询检查子查询是否有输出结果,如果有至少一行结果,则判定为true,否则判定为false。通常Exists子查询被用于关联子查询,也就是说针对外层查询的每一行数据,判定Exists子查询的结果。 如果是非关联子查询,则对于外层...
I was recommended the ITIL 4 Foundation course by an IT professional who had completed the same course at Microtek Learning. The training gave me a thorough understanding of service management that I felt I could take back to my job as an IT project Management and apply it to improve the ...
这个查询比较复杂,也比较典型,自从用了ORM后,很久没有写过SQL语句了,于是我研究了下,自己也写了一个: WITH cte1 as ( select stu.deptID, D.depName...大名鼎鼎的 iBatis,MyBaits.Net 就是这样的功能,但它定义了一套复杂的规则,配置起来很复杂,项目可能80%的时间都在写查询配置,如果没有代码工具开发工作量...
TIA Portal V18, PLCSIM Advance V5.0, PLCSIM V18 simulation project without PLCs 15 -- 1:33:01 App Mixing Modbus TCP_IP with Modbus RTU full tutorial 18 -- 1:06 App modbus with temp sensor 525 -- 0:33 App unity 仿真西门子plc 16 -- 19:06 App password generator with wpf 346...
SELECTcourse_name, course_time, course_locationFROMcoursesWHEREcourse_name='数学'ANDstatus=1; 参数说明 SELECT后需要输入待转换为SQL语句的问题。 basic_index_name为当前数据库检索索引表名称。 pattern_index_name为问题模板索引表名称。 WITH()内支持配置多个参数,以便对相关行为进行设置(其他参数说明请参见在线...
( select cno from course where cname='数据库原理' ) ) 14、查询没有选修1002课程的学生的学生姓名。 Select snamefrom student where sno notin ( select sno from sc where cno='1002') 或: select sname from student where notexists (select * from sc where cno='1002' and sno=student.sno) ...
create view B_Grade(id,name,Kname,Ggrade) as select Student.id,name,Kname,Ggrade from Student,Grade,Course where Student.id = Grade.id and Grade.Kid = Course.Kid with check option 视图的执行结果如下: 3:创建学生奖惩视图,实现查询各个学生的学号、姓名、班级、专业、院系、奖惩号、奖惩名、奖...
INSERT INTO `course_category` VALUES ('1-4-1', 'Oracle', 'Oracle', '1-4', 1, 1, 1); INSERT INTO `course_category` VALUES ('1-4-2', 'MySQL', 'MySQL', '1-4', 1, 2, 1); INSERT INTO `course_category` VALUES ('1-4-3', 'SQL Server', 'SQL Server', '1-4', 1, ...