Oracle 常用语法练习
用的是自带的emp,salgrade,dept表,Oracle11G下测试通过。
--
1.列出所有员工及直接上级的姓名
select
e.ename,nvl(m.ename,
'
无
'
)
from
emp e,emp m
where
e.mgr
=
m.empno(
+
);
--
2.列出受雇日期早于其直接上级的所有员工的编号,姓名,部门名称
select
e.empno,e.ename,d.dname
from
emp e,emp m,dept d
where
e.mgr
=
m.empno(
+
)
and
e.deptno
=
d.deptno
and
e.HIREDATE
<
m.hiredate;
--
3.列出部门名称和这些部门的员工信息,同时列出那些没有员工的部门.
select
d.dname,nvl(e.ename,
'
无
'
)
from
emp e,dept d
where
e.deptno(
+
)
=
d.deptno;
--
4.列出至少有一个员工的所有部门
select
d.dname,
count
(e.empno)
from
emp e,dept d
where
e.deptno
=
d.deptno
group
by
d.dname
having
count
(e.empno)
>
0
;
--
5.列出薪金比"SMITH"多的所有员工信息.
select
*
from
emp
where
sal
>
(
select
sal
from
emp
where
ename
=
'
SMITH
'
);
--
6.列出所有"CLERK"(办事员)的姓名及其部门名称,部门的人数.
select
e.ename,d.dname,ed.cc
from
emp e,dept d,(
select
deptno,
count
(empno) cc
from
emp
group
by
deptno) ed
where
e.deptno
=
d.deptno
and
d.deptno
=
ed.deptno
and
e.job
=
'
CLERK
'
;
select
*
from
emp
where
JOB
=
'
CLERK
'
;
--
7.列出最低薪金大于1500的各种工作及从事此工作的全部雇员人数.
select
e.job,
count
(e.empno)
from
emp e
where
e.job
in
(
select
job
from
emp
group
by
job
having
min
(sal)
>
1500
)
group
by
e.job;
--
8.列出在部门"SALES"<销售部>工作的员工的姓名,假定不知道销售部的部门编号.
select
ename
from
emp
where
deptno
=
(
select
deptno
from
dept
where
dname
=
'
SALES
'
);
--
9.列出薪金高于公司平均薪金的所有员工,所在部门,上级领导,雇员的工资等级.
select
ename 姓名,d.dname 部门名称,nvl((
select
m.ename
from
emp m
where
e.mgr
=
m.empno),
'
无
'
) 上级领导,(
select
grade
from
salgrade
where
e.sal
between
losal
and
hisal) 工资等级
from
emp e,dept d
where
e.deptno
=
d.deptno
and
e.sal
>
(
select
avg
(sal)
from
emp);
--
或
select
e.ename 姓名,d.dname 部门名称,nvl(m.ename,
'
无
'
) 上级领导,s.grade 工资等级
from
emp e,dept d,emp m,salgrade s
where
e.deptno
=
d.deptno
and
e.sal
>
(
select
avg
(sal)
from
emp)
and
e.deptno
=
d.deptno
and
e.mgr
=
m.empno(
+
)
and
e.sal
between
losal
and
hisal;
--
10.列出与"SCOTT"从事相同工作的所有员工及部门名称.
select
e.ename,d.dname
from
emp e,dept d
where
e.deptno
=
d.deptno
and
e.job
=
(
select
job
from
emp
where
ename
=
'
SCOTT
'
)
and
e.ename
<>
'
SCOTT
'
;
--
11.列出薪金等于部门30中员工的薪金的所有员工的姓名和薪金.
select
ename,sal
from
emp
where
sal
in
(
select
sal
from
emp
where
deptno
=
30
)
and
deptno
<>
30
;
--
12.列出薪金高于在部门30工作的所有员工的薪金的员工姓名和薪金.部门名称.
select
e.ename,e.sal,d.dname
from
emp e,dept d
where
e.deptno
=
d.deptno
and
e.sal
>
all
(
select
sal
from
emp
where
deptno
=
30
)
and
e.deptno
<>
30
;
--
13.列出在每个部门工作的员工数量,平均工资和平均服务期限.
select
d.dname 部门名称,ed.c 员工数量,
round
(ed.a,
2
) 平均工资,
round
(ed.h,
0
) 服务期限
from
dept d,(
select
deptno,
count
(empno) c,
avg
(sal) a,
avg
(months_between(sysdate,hiredate)
/
12
) h
from
emp
group
by
deptno) ed
where
d.deptno
=
ed.deptno;
--
或
select
d.dname 部门名称,
count
(e.empno) 员工数量,
round
(
avg
(e.sal),
2
) 平均工资,
round
(
avg
(months_between(sysdate,hiredate)
/
12
),
0
) 服务期限
from
emp e,dept d
where
e.deptno
=
d.deptno
group
by
d.dname;
--
14.列出所有员工的姓名、部门名称和工资。
select
e.ename,d.dname,e.sal
from
emp e,dept d
where
e.deptno
=
d.deptno;
--
15.列出所有部门的详细信息和人数
select
d.
*
,(
select
count
(e.empno)
from
emp e
where
e.deptno
=
d.deptno) 人数
from
dept d;
--
或
select
d.
*
,nvl(ed.c,
0
) 人数
from
dept d,(
select
deptno,
count
(empno) c
from
emp
group
by
deptno) ed
where
d.deptno
=
ed.deptno(
+
);
--
16.列出各种工作的最低工资及从事此工作的雇员姓名
select
*
from
emp
where
sal
in
(
select
min
(sal) sal
from
emp
group
by
job)
--
17.列出各个部门的MANAGER(经理)的最低薪金
select
deptno,
min
(sal)
from
emp
where
job
=
'
MANAGER
'
group
by
deptno;
--
18.列出所有员工的年工资,按年薪从低到高排序
select
ename, (sal
+
nvl(comm,
0
))
*
12
income
from
emp
order
by
income;
--
19.查出某个员工的上级主管，并要求出这些主管中的薪水超过3000.
select
distinct
m.ename 主管, m.sal 主管工资
from
emp e,emp m
where
e.mgr
=
m.empno
and
m.sal
>
3000
;
--
20.求出部门名称中,带'S'字符的部门员工的工资合计、部门人数.
select
d.dname 部门,
count
(e.sal) 工资合计,
count
(e.empno) 部门人数
from
emp e,dept d
where
e.deptno(
+
)
=
d.deptno
and
d.dname
like
'
%S%
'
group
by
d.dname;
--
21.给任职日期超过10年的员工加薪10%.
update
emp
set
sal
=
sal
+
sal
*
0.1
where
(months_between(sysdate,hiredate)
/
12
)
>
10
;
