>
<
>=
<==!=
<>
select
*from
employees
where
salary>
12000
;
select
last_name,
department_id
from
employees
where
department_id<>
90;
select
last_name,
salary,
commission_pct
from
employees
where
salary>=
10000
and salary<=
20000
;
select
*from
employees
where
not(department_id>=
90and department_id<=
110)
or salary>
15000
;
select
*from coupon where name like
'%洗車_信'
select
*from
employees
where
employee_id >=
120and employee_id<=
100;
select
*from
employees
where
employee_id between
120and
100;
案例：查詢員工的工種編號是 it_prog、ad_vp、ad_pres中的乙個員工名和工種編號
select
last_name,
job_id
from
employees
where
job_id =
'it_prot'
or job_id =
'ad_vp'
or job_id =
'ad_pres'
;
select
last_name,
job_id
from
employees
where
job_id in
('it_prot'
,'ad_vp'
,'ad_pres'
);
select
last_name,
commission_pct
from
employees
where
commission_pct is
null
;
select
last_name,
commission_pct
from
employees
where
commission_pct is
notnull
;
select
last_name,
commission_pct
from
employees
where
salary is
12000
;
select
last_name,
commission_pct
from
employees
where
commission_pct <=>
null
;
select
last_name,
salary
from
employees
where
salary <=>
12000
;
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