Mysql中表student_table(id,name,birth,sex),插入如下记录: (‘1004’ , ‘张三’ , ‘2000-08-06’ , ‘男’); (‘1005’ , NULL , ‘2001-12-01’ , ‘女’); (‘1006’ , ‘张三’ , ‘2000-08-06’ , ‘女’); (‘1007’ , ‘王五’ , ‘2001-12-01’ , ‘男’); (‘1008’ , ‘李四’ , NULL, ‘女’); (‘1009’ , ‘李四’ , NULL, ‘男’); (‘1010’ , ‘李四’ , ‘2001-12-01’, ‘女’); 执行 select t1.*,t2.* from ( select * from student_table where sex = ‘男’ ) t1  right  join  (select * from student_table where sex = ‘女’) t2  on t1.birth = t2.birth and t1.name = t2.name ;  的结果行数是()?-笔试面试资料

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提供答案分析,通过本文《Mysql中表student_table(id,name,birth,sex),插入如下记录: (‘1004’ , ‘张三’ , ‘2000-08-06’ , ‘男’);
(‘1005’ , NULL , ‘2001-12-01’ , ‘女’);
(‘1006’ , ‘张三’ , ‘2000-08-06’ , ‘女’); (‘1007’ , ‘王五’ , ‘2001-12-01’ , ‘男’);
(‘1008’ , ‘李四’ , NULL, ‘女’);
(‘1009’ , ‘李四’ , NULL, ‘男’); (‘1010’ , ‘李四’ , ‘2001-12-01’, ‘女’); 执行 select t1.*,t2.*
from (
select * from student_table where sex = ‘男’ ) t1 
right  join 
(select * from student_table where sex = ‘女’) t2 
on t1.birth = t2.birth and t1.name = t2.name ; 
的结果行数是()?-笔试面试资料》可以理解其中的代码原理,这是一篇很好的求职学习资料
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答案:

Mysql中表student_table(id,name,birth,sex),插入如下记录:
(‘1004’ , ‘张三’ , ‘2000-08-06’ , ‘男’);
(‘1005’ , NULL , ‘2001-12-01’ , ‘女’);
(‘1006’ , ‘张三’ , ‘2000-08-06’ , ‘女’);
(‘1007’ , ‘王五’ , ‘2001-12-01’ , ‘男’);
(‘1008’ , ‘李四’ , NULL, ‘女’);
(‘1009’ , ‘李四’ , NULL, ‘男’);
(‘1010’ , ‘李四’ , ‘2001-12-01’, ‘女’);

执行

select t1.*,t2.*
from (
select * from student_table where sex = ‘男’ ) t1 
right  join 
(select * from student_table where sex = ‘女’) t2 
on t1.birth = t2.birth and t1.name = t2.name ; 
的结果行数是()?
Mysql中表student_table(id,name,birth,sex),插入如下记录:       ('1004' , '张三' , '2000-08-06' , '男');   ('1005' , NULL , '2001-12-01' , '女');         ('1006' , '张三' , '2000-08-06' , '女');           ('1007' , ‘王五’ , '2001-12-01' , '男');            ('1008' , '李四' , NULL, '女');            ('1009' , '李四' , NULL, '男');          ('1010' , '李四' , '2001-12-01', '女');      执行    select t1.*,t2.*   from (   select * from student_table where sex = '男' ) t1    right  join    (select * from student_table where sex = '女') t2    on t1.birth = t2.birth and t1.name = t2.name ;    的结果行数是()? 五木二水
RIGHT JOIN 关键字会返回右表 (t2) 所有的行(本题***4行),即使在左表 (t1) 中没有匹配的行。

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qklbishe.com区块链毕设代做网专注|以太坊fabric-计算机|java|毕业设计|代做平台 » Mysql中表student_table(id,name,birth,sex),插入如下记录: (‘1004’ , ‘张三’ , ‘2000-08-06’ , ‘男’); (‘1005’ , NULL , ‘2001-12-01’ , ‘女’); (‘1006’ , ‘张三’ , ‘2000-08-06’ , ‘女’); (‘1007’ , ‘王五’ , ‘2001-12-01’ , ‘男’); (‘1008’ , ‘李四’ , NULL, ‘女’); (‘1009’ , ‘李四’ , NULL, ‘男’); (‘1010’ , ‘李四’ , ‘2001-12-01’, ‘女’); 执行 select t1.*,t2.* from ( select * from student_table where sex = ‘男’ ) t1  right  join  (select * from student_table where sex = ‘女’) t2  on t1.birth = t2.birth and t1.name = t2.name ;  的结果行数是()?-笔试面试资料

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