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Assignment 3
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Assignment 3
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ubuntu@ubuntu-OptiPlex-5000:~$ mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
ubuntu@ubuntu-OptiPlex-5000:~$ mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
ubuntu@ubuntu-OptiPlex-5000:~$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 8.0.29-0ubuntu0.22.04.2 (Ubuntu)
Copyright (c) 2000, 2022, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use employee;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select * from employee;
ERROR 1146 (42S02): Table 'employee.employee' doesn't exist
mysql> show tables;
+--------------------+
| Tables_in_employee |
+--------------------+
| emp_info |
+--------------------+
1 row in set (0.00 sec)
mysql> select * from emp_info;
+--------+----------+--------+------------+
| emp_id | emp_name | city | emp_salary |
+--------+----------+--------+------------+
| 1 | Pravin | Nashik | 50000 |
| 2 | Atharva | Pune | 70000 |
+--------+----------+--------+------------+
2 rows in set (0.02 sec)
mysql>
mysql>
mysql>
mysql> "
">
">
">
">
">
">
">
">
"> ^C
mysql> alter table emp_info add column skills;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
mysql> alter table emp_info add column skills varchar(25);
Query OK, 0 rows affected (0.03 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> update emp_info set skills="web dev";
Query OK, 2 rows affected (0.01 sec)
Rows matched: 2 Changed: 2 Warnings: 0
mysql> select * from emp_info;
+--------+----------+--------+------------+---------+
| emp_id | emp_name | city | emp_salary | skills |
+--------+----------+--------+------------+---------+
| 1 | Pravin | Nashik | 50000 | web dev |
| 2 | Atharva | Pune | 70000 | web dev |
+--------+----------+--------+------------+---------+
2 rows in set (0.00 sec)
mysql> update emp_info set skills="app dev" where emp_name="Atharva";
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql>
mysql> select * from emp_info;
+--------+----------+--------+------------+---------+
| emp_id | emp_name | city | emp_salary | skills |
+--------+----------+--------+------------+---------+
| 1 | Pravin | Nashik | 50000 | web dev |
| 2 | Atharva | Pune | 70000 | app dev |
+--------+----------+--------+------------+---------+
2 rows in set (0.00 sec)
mysql> alter table emp_info modify emp_id int auto_increment primary key;
ERROR 1068 (42000): Multiple primary key defined
mysql> insert into emp_info value(3,"Ashish","Pimpri",40000,"ML");
Query OK, 1 row affected (0.02 sec)
mysql> select * from emp_info;
+--------+----------+--------+------------+---------+
| emp_id | emp_name | city | emp_salary | skills |
+--------+----------+--------+------------+---------+
| 1 | Pravin | Nashik | 50000 | web dev |
| 2 | Atharva | Pune | 70000 | app dev |
| 3 | Ashish | Pimpri | 40000 | ML |
+--------+----------+--------+------------+---------+
3 rows in set (0.00 sec)
mysql> insert into emp_info value(4,"Yash","pune",60000,"web dev");
Query OK, 1 row affected (0.01 sec)
mysql> insert into emp_info value(4,"om","pune",70000,"data science");
ERROR 1062 (23000): Duplicate entry '4' for key 'emp_info.PRIMARY'
mysql> insert into emp_info value(5,"om","pune",70000,"data science");
ERROR 1062 (23000): Duplicate entry '70000' for key 'emp_info.emp_salary'
mysql> insert into emp_info value(5,"om","pune",57000,"data science");
Query OK, 1 row affected (0.00 sec)
mysql> insert into emp_info value(6,"Tejas","Mumbai",90000,"web dev");
Query OK, 1 row affected (0.01 sec)
mysql> select * from emp_info;
+--------+----------+--------+------------+--------------+
| emp_id | emp_name | city | emp_salary | skills |
+--------+----------+--------+------------+--------------+
| 1 | Pravin | Nashik | 50000 | web dev |
| 2 | Atharva | Pune | 70000 | app dev |
| 3 | Ashish | Pimpri | 40000 | ML |
| 4 | Yash | pune | 60000 | web dev |
| 5 | om | pune | 57000 | data science |
| 6 | Tejas | Mumbai | 90000 | web dev |
+--------+----------+--------+------------+--------------+
6 rows in set (0.00 sec)
mysql> select emp_id ,emp_name from emp_info;
ERROR 2013 (HY000): Lost connection to MySQL server during query
No connection. Trying to reconnect...
Connection id: 8
Current database: employee
+--------+----------+
| emp_id | emp_name |
+--------+----------+
| 1 | Pravin |
| 2 | Atharva |
| 3 | Ashish |
| 4 | Yash |
| 5 | om |
| 6 | Tejas |
+--------+----------+
6 rows in set (0.04 sec)
mysql> select distinct(city) from emp_info;
+--------+
| city |
+--------+
| Nashik |
| Pune |
| Pimpri |
| Mumbai |
+--------+
4 rows in set (0.00 sec)
mysql> select count(distinct(skills)) from emp_info;
+-------------------------+
| count(distinct(skills)) |
+-------------------------+
| 4 |
+-------------------------+
1 row in set (0.01 sec)
mysql> select max(emp_salary) from emp_info;
+-----------------+
| max(emp_salary) |
+-----------------+
| 90000 |
+-----------------+
1 row in set (0.00 sec)
mysql> select emp_id,emp_name from emp_info where emp_salary between 57000 and 70000;
+--------+----------+
| emp_id | emp_name |
+--------+----------+
| 5 | om |
| 4 | Yash |
| 2 | Atharva |
+--------+----------+
3 rows in set (0.00 sec)
mysql> select * from emp_info where city like "P%";
+--------+----------+--------+------------+--------------+
| emp_id | emp_name | city | emp_salary | skills |
+--------+----------+--------+------------+--------------+
| 2 | Atharva | Pune | 70000 | app dev |
| 3 | Ashish | Pimpri | 40000 | ML |
| 4 | Yash | pune | 60000 | web dev |
| 5 | om | pune | 57000 | data science |
+--------+----------+--------+------------+--------------+
4 rows in set (0.00 sec)
mysql> select emp_name from emp_info where emp_salary in (50000,90000);
+----------+
| emp_name |
+----------+
| Pravin |
| Tejas |
+----------+
ASSIGNMENT 3: PART 2
ubuntu@ubuntu-OptiPlex-5000:~$ mysql -u
mysql: [ERROR] mysql: option '-u' requires an argument.
ubuntu@ubuntu-OptiPlex-5000:~$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.30-0ubuntu0.22.04.1 (Ubuntu)
Copyright (c) 2000, 2022, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use employee
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables
-> show tables;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'show tables' at line 2
mysql> show tables;
+--------------------+
| Tables_in_employee |
+--------------------+
| Employee_1 |
| Students |
| emp_info |
| employee |
+--------------------+
4 rows in set (0.00 sec)
mysql> select * from employee
-> select * from employee;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'select * from employee' at line 2
mysql> select * from employee select * from employee;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'select * from employee' at line 1
mysql> select * from employee;
+----+---------+--------+-----------------+---------------+
| ID | empname | salary | designation | Address |
+----+---------+--------+-----------------+---------------+
| 1 | Nishant | 23724 | Manager | Ahmednagar |
| 6 | E | 49999 | Employee | SambhajiNagar |
| 9 | C | 34504 | Project Manager | Pune |
| 11 | B | 100004 | CEO | Mumbai |
| 13 | H | 31179 | Junior Employee | Kolhapur |
| 19 | I | 36383 | Employee | Ahmednagar |
| 36 | D | 67504 | Data Scientist | Pune |
| 39 | G | 63179 | Senior Employee | Solapur |
| 41 | F | 51179 | Co-manager | Thane |
| 71 | A | 50024 | Employee | Nashik |
+----+---------+--------+-----------------+---------------+
10 rows in set (0.03 sec)
mysql> emp_info
-> emp_info;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'emp_info
emp_info' at line 1
mysql> emp_info;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'emp_info' at line 1
mysql> select * from emp_info;
+--------+----------+--------+------------+--------------+
| emp_id | emp_name | city | emp_salary | skills |
+--------+----------+--------+------------+--------------+
| 1 | Pravin | Nashik | 50000 | web dev |
| 2 | Atharva | Pune | 70000 | app dev |
| 3 | Ashish | Pimpri | 40000 | ML |
| 4 | Yash | pune | 60000 | web dev |
| 5 | om | pune | 57000 | data science |
| 6 | Tejas | Mumbai | 90000 | web dev |
+--------+----------+--------+------------+--------------+
6 rows in set (0.02 sec)
mysql> use employee;
Database changed
mysql> create table emp_more;
ERROR 4028 (HY000): A table must have at least one visible column.
mysql> alter table emp_info add column experience_in_yr int ,DOB varchar(12);
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DOB varchar(12)' at line 1
mysql> alter table emp_info add column experience_in_yr int ,DOB varchar(12);
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DOB varchar(12)' at line 1
mysql> alter table emp_info add column experience_in_yr int;
Query OK, 0 rows affected (0.02 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> select * from emp_info;
+--------+----------+--------+------------+--------------+------------------+
| emp_id | emp_name | city | emp_salary | skills | experience_in_yr |
+--------+----------+--------+------------+--------------+------------------+
| 1 | Pravin | Nashik | 50000 | web dev | NULL |
| 2 | Atharva | Pune | 70000 | app dev | NULL |
| 3 | Ashish | Pimpri | 40000 | ML | NULL |
| 4 | Yash | pune | 60000 | web dev | NULL |
| 5 | om | pune | 57000 | data science | NULL |
| 6 | Tejas | Mumbai | 90000 | web dev | NULL |
+--------+----------+--------+------------+--------------+------------------+
6 rows in set (0.00 sec)
mysql> update emp_info set experience_in_yr=2 where emp_id=1;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from emp_info;
+--------+----------+--------+------------+--------------+------------------+
| emp_id | emp_name | city | emp_salary | skills | experience_in_yr |
+--------+----------+--------+------------+--------------+------------------+
| 1 | Pravin | Nashik | 50000 | web dev | 2 |
| 2 | Atharva | Pune | 70000 | app dev | NULL |
| 3 | Ashish | Pimpri | 40000 | ML | NULL |
| 4 | Yash | pune | 60000 | web dev | NULL |
| 5 | om | pune | 57000 | data science | NULL |
| 6 | Tejas | Mumbai | 90000 | web dev | NULL |
+--------+----------+--------+------------+--------------+------------------+
6 rows in set (0.00 sec)
mysql> update emp_info set experience_in_yr=4 where emp_id=2;
Query OK, 1 row affected (0.06 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update emp_info set experience_in_yr=3 where emp_id=3;
Query OK, 1 row affected (0.06 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update emp_info set experience_in_yr=6 where emp_id=4;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update emp_info set experience_in_yr=1 where emp_id=5;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update emp_info set experience_in_yr=8 where emp_id=6;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from emp_info;
+--------+----------+--------+------------+--------------+------------------+
| emp_id | emp_name | city | emp_salary | skills | experience_in_yr |
+--------+----------+--------+------------+--------------+------------------+
| 1 | Pravin | Nashik | 50000 | web dev | 2 |
| 2 | Atharva | Pune | 70000 | app dev | 4 |
| 3 | Ashish | Pimpri | 40000 | ML | 3 |
| 4 | Yash | pune | 60000 | web dev | 6 |
| 5 | om | pune | 57000 | data science | 1 |
| 6 | Tejas | Mumbai | 90000 | web dev | 8 |
+--------+----------+--------+------------+--------------+------------------+
6 rows in set (0.00 sec)
mysql> select emp_id,emp_name,city from emp_info where emp_id in (1,4);
+--------+----------+--------+
| emp_id | emp_name | city |
+--------+----------+--------+
| 1 | Pravin | Nashik |
| 4 | Yash | pune |
+--------+----------+--------+
2 rows in set (0.00 sec)
mysql> create view data as select emp_id,emp_name,city from emp_info where emp_id in (1,4);
Query OK, 0 rows affected (0.00 sec)
mysql> select * from data;
+--------+----------+--------+
| emp_id | emp_name | city |
+--------+----------+--------+
| 1 | Pravin | Nashik |
| 4 | Yash | pune |
+--------+----------+--------+
2 rows in set (0.00 sec)
mysql> create view salary_data as select experience_in_yr,emp_salary,skills from
emp_info where emp_id in (5,2);
Query OK, 0 rows affected (0.03 sec)
mysql> select * from salary_data;
+------------------+------------+--------------+
| experience_in_yr | emp_salary | skills |
+------------------+------------+--------------+
| 4 | 70000 | app dev |
| 1 | 57000 | data science |
+------------------+------------+--------------+
2 rows in set (0.01 sec)
mysql> drop view data;
Query OK, 0 rows affected (0.03 sec)
mysql> select * from data;
ERROR 1146 (42S02): Table 'employee.data' doesn't exist
mysql> ALTER VIEW salary_data (emp_id,emp_salary) AS SELECT emp_id,emp_salary, FROM emp_info;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM emp_info' at line 1
mysql> select *from salary_data;
+------------------+------------+--------------+
| experience_in_yr | emp_salary | skills |
+------------------+------------+--------------+
| 4 | 70000 | app dev |
| 1 | 57000 | data science |
+------------------+------------+--------------+
2 rows in set (0.00 sec)
mysql> create view data as select * from emp_info;
Query OK, 0 rows affected (0.03 sec)
mysql> select * from data;
+--------+----------+--------+------------+--------------+------------------+
| emp_id | emp_name | city | emp_salary | skills | experience_in_yr |
+--------+----------+--------+------------+--------------+------------------+
| 1 | Pravin | Nashik | 50000 | web dev | 2 |
| 2 | Atharva | Pune | 70000 | app dev | 4 |
| 3 | Ashish | Pimpri | 40000 | ML | 3 |
| 4 | Yash | pune | 60000 | web dev | 6 |
| 5 | om | pune | 57000 | data science | 1 |
| 6 | Tejas | Mumbai | 90000 | web dev | 8 |
+--------+----------+--------+------------+--------------+------------------+
6 rows in set (0.00 sec)
mysql> ALTER VIEW data (emp_id,emp_salary) AS SELECT emp_id,emp_salary, FROM emp_info;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM emp_info' at line 1
mysql> ALTER VIEW data (emp_id,emp_salary) AS SELECT emp_id,emp_salary, FROM emp_info;
PART 3 SUBQUERIES
mysql> use employee
Database changed
mysql> select * from emp_info;
+--------+----------+--------+------------+--------------+------------------+
| emp_id | emp_name | city | emp_salary | skills | experience_in_yr |
+--------+----------+--------+------------+--------------+------------------+
| 1 | Pravin | Nashik | 50000 | web dev | 2 |
| 2 | Atharva | Pune | 70000 | app dev | 4 |
| 3 | Ashish | Pimpri | 40000 | ML | 3 |
| 4 | Yash | pune | 60000 | web dev | 6 |
| 5 | om | pune | 57000 | data science | 1 |
| 6 | Tejas | Mumbai | 90000 | web dev | 8 |
+--------+----------+--------+------------+--------------+------------------+
6 rows in set (0.03 sec)
mysql> select * from emp_info where skills =(select skills from emp_info where emp_name="Pravin");
+--------+----------+--------+------------+---------+------------------+
| emp_id | emp_name | city | emp_salary | skills | experience_in_yr |
+--------+----------+--------+------------+---------+------------------+
| 1 | Pravin | Nashik | 50000 | web dev | 2 |
| 4 | Yash | pune | 60000 | web dev | 6 |
| 6 | Tejas | Mumbai | 90000 | web dev | 8 |
+--------+----------+--------+------------+---------+------------------+
3 rows in set (0.00 sec)
mysql> select * from emp_info where emp_salary>(select emp_salary from emp_info
where emp_name="Ashish");
+--------+----------+--------+------------+--------------+------------------+
| emp_id | emp_name | city | emp_salary | skills | experience_in_yr |
+--------+----------+--------+------------+--------------+------------------+
| 1 | Pravin | Nashik | 50000 | web dev | 2 |
| 5 | om | pune | 57000 | data science | 1 |
| 4 | Yash | pune | 60000 | web dev | 6 |
| 2 | Atharva | Pune | 70000 | app dev | 4 |
| 6 | Tejas | Mumbai | 90000 | web dev | 8 |
+--------+----------+--------+------------+--------------+------------------+
5 rows in set (0.00 sec)
mysql> select * from emp_info where emp_id in (select emp_id from emp_info where emp_salary >50000);
+--------+----------+--------+------------+--------------+------------------+
| emp_id | emp_name | city | emp_salary | skills | experience_in_yr |
+--------+----------+--------+------------+--------------+------------------+
| 5 | om | pune | 57000 | data science | 1 |
| 4 | Yash | pune | 60000 | web dev | 6 |
| 2 | Atharva | Pune | 70000 | app dev | 4 |
| 6 | Tejas | Mumbai | 90000 | web dev | 8 |
+--------+----------+--------+------------+--------------+------------------+
4 rows in set (0.00 sec)
Part 4
mysql> use employee;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+--------------------+
| Tables_in_employee |
+--------------------+
| customer |
| customer1 |
| emp |
| employee |
+--------------------+
4 rows in set (0.00 sec)
mysql> select * from employee;
+--------+----------+---------------+---------+
| emp_id | emp_name | working_hours | city |
+--------+----------+---------------+---------+
| 101 | Yash | 5 | Pune |
| 102 | Kunal | 3 | Chennai |
| 103 | Yash | 3 | Pune |
| 104 | Kunal | 4 | Chennai |
| 105 | Sid | 4 | Mumbai |
| 106 | OM | 2 | Mumbai |
| 107 | Sid | 1 | Mumbai |
+--------+----------+---------------+---------+
7 rows in set (0.00 sec)
mysql> select city,count(emp_name) from employee group by city having count(emp_name)>2;
+--------+-----------------+
| city | count(emp_name) |
+--------+-----------------+
| Mumbai | 3 |
+--------+-----------------+
1 row in set (0.00 sec)
mysql> select emp_name,sum(working_hours) from employee group by emp_name;
+----------+--------------------+
| emp_name | sum(working_hours) |
+----------+--------------------+
| Yash | 8 |
| Kunal | 7 |
| Sid | 5 |
| OM | 2 |
+----------+--------------------+
4 rows in set (0.00 sec)
mysql> select emp_id,sum(working_hours) from employee group by emp_id;
+--------+--------------------+
| emp_id | sum(working_hours) |
+--------+--------------------+
| 101 | 5 |
| 102 | 3 |
| 103 | 3 |
| 104 | 4 |
| 105 | 4 |
| 106 | 2 |
| 107 | 1 |
+--------+--------------------+
7 rows in set (0.00 sec)
mysql> select * from employee where city=(select city from employee where emp_id="101";
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
mysql> select * from employee where city=(select city from employee where emp_id="101");
+--------+----------+---------------+------+
| emp_id | emp_name | working_hours | city |
+--------+----------+---------------+------+
| 101 | Yash | 5 | Pune |
| 103 | Yash | 3 | Pune |
+--------+----------+---------------+------+
2 rows in set (0.00 sec)
mysql> select * from employee where city=(select city from employee where emp_id="105");
+--------+----------+---------------+--------+
| emp_id | emp_name | working_hours | city |
+--------+----------+---------------+--------+
| 105 | Sid | 4 | Mumbai |
| 106 | OM | 2 | Mumbai |
| 107 | Sid | 1 | Mumbai |
+--------+----------+---------------+--------+
3 rows in set (0.00 sec)