1 #1.查詢工資最低的員工資訊：last name, salary
2select
3last_name,
4salary
5from
6employees
7where
8 salary =(9
select
10min
(salary)
11from
12employees
13);
1415 #2
.查詢平均工資最低的部門資訊
16select17*
18from
19departments
20where
21 department_id =(22
select
23department_id
24from
25employees
26group
by27
department_id
28order
by29
**g(salary)
30 limit 1
31);
3233 #3
.查詢平均工資最低的部門資訊和該部門的平均工資
34#①各部門的平均工資
35select
36**g
(salary),
37department_id
38from
39employees
40group
by41
department_id #②求出最低平均工資的部門編號
42select
43**g
(salary),
44department_id
45from
46employees
47group
by48
department_id
49order
by50
**g(salary)
51 limit 1;52
53#③查詢部門資訊
54select
55 d.*
, ag
56from
57departments d
58join(59
select
60**g
(salary),
61department_id
62from
63employees
64group
by65
department_id
66order
by67
**g(salary)
68 limit 1
69 ) ag_dep on d.department_id = ag_dep.department_id #4
.查詢平均工資最高的job資訊
70select
71**g
(salary)
72from
73employees
74group
by75
job_id
76order
by77
**g(salary) desc
78 limit 1 ②查詢job資訊 select79*
80from
81jobs
82where
83 job_id =(84
select
85job_id
86from
87employees
88group
by89
job_id
90order
by91
**g(salary) desc
92 limit 1
93);
9495 #5
.查詢平均工資高於公司平均工資的部門有哪些？
96select
97**g
(salary),
98department_id
99from
100employees
101group
by102
department_id;
103104
105h**ing
106**g(salary) >
(107
select
108**g
(salary)
109from
110employees
111);
112113 #6
.查詢出公司中所有 manager的詳細資訊
114select
115*
116from
117employees
118where
119 employee_id in
(120
select
distinct
121manager_id
122from
123employees
124);
125126 #7
.各個部門中最高工資中最低的那個部門的最低工資是多少
127select
128min
(salary),
129department_id
130from
131employees
132where
133 department_id =
(134
select
135department_id
136from
137employees
138group
by139
department_id
140order
by141
max(salary)
142 limit 1
143);
144145 #8
.查詢平均工資最高的部門的 manager的詳細資訊：last_name, department id, email
146select
147last_name,
148d.department_id,
149email,
150salary
151from
152employees e
153join departments d on d.manager_id =
e.manager_id
154where
155 d.department_id =
(156
select
157department_id
158from
159employees
160group
by161
department_id
162order
by163
**g(salary) desc
164 limit 1
165 );
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