编程语言单选难度 3真题改编 · 2023
107. list_a = [1,2,3,4,5,6,7,8,9]
for i in range(len(list_a)):
print(i)
if list_a[i] >= 3:
del list_a[i]
print(list_a)
运行后返回结果是:
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数据库单选难度 3真题改编 · 2023
130. 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 count(t1.birth) as c1
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()?
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