学习笔记之--047.第二章 限制和排序数据

语法:select * |{[DISTINCT] column | expression [alias],...} FROM table [WHERE condition(s)];

select employee_id,last_name,job_id,department_id from employees where department_id=90;

=

>
>=
<
<=
<>
BETWEEN...AND...
IN(set)
like
is null
select last_name,salary from employees where salary <=3000;
select last_name,salary from employees where salary salary BETWEEN 2000 AND 3500;select employee_id,last_name,salary,manager_id from employees where manager_id IN (100,102,201); select first_name from employees where first_name like '_S%';
%匹配符 _匹配符逻辑运算
and or not排序
ORDER BY 默认升序,只影响前当前字段.ASC 升序
DESC 降序
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