access中查询姓李的查询方法

or和and的使用

查找学生姓名以’李’开头或者年龄为’20’的学生信息

select *from student where name like '李%' or age = '20'

查找学生姓名以’李’开头并且年龄为’20’的学生信息

select *from student where name like '李%' and age = '20'

查找学生姓名以’李’开头或者年龄为’20’性别为’女’的学生信息

select *from student where name like '李%' or age = '20' and sex = '女'

查找学生姓名以’李’开头性别为’女’或者年龄为’20’性别为’女’的学生信息

select *from student where (name like '李%' or age = '20') and sex = '女'

between的使用

查找学生年龄在20到21之间(包含20和21)的学生信息

select *from student where age between 20 and 21

查找学生年龄不在20到21之间(包含20和21)的学生信息

select *from student where age not between 20 and 21

in的使用

查找学生年龄在20到21之间(包含20和21)的学生信息

select *from student where age in('20','21')
相当于
select *from student where age = '20' or age = '21'

查找学生年龄不在20到21之间(包含20和21)的学生信息

select *from student where age not in('20','21')

is null 和增加列

上面我们没有地址这一列数据,现在我们插入地址列,增加信息

更新数据添加一列

alter table student
add address varchar(10)

查询更新后的信息

select *from student

更新增加列的内容

update student
set address = '北京'
where id = '3'

update student
set address = '上海'
where id = '4'

update student
set address = '广州'
where id = '5'

update student
set address = '深圳'
where id = '6'

update student
set address = '北京'
where id = '7'

我们增加一部分内容即可,不要全部增加

查询地址是否为空

select *from student where address is null

查询地址是否不为空

select *from student where address is not null