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Assignment 2
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Assignment 2
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mysql> show databases;
+--------------------+
| Database |
+--------------------+
| emp |
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
5 rows in set (0.00 sec)
mysql> use emp;
Database changed
mysql> create table employee(id int, name varchar(10), post varchar(15), salary int);
Query OK, 0 rows affected (0.02 sec)
mysql> select * from employee;
Empty set (0.00 sec)
mysql> INSERT INTO employee values(1,"mandy","developer",50000);
Query OK, 1 row affected (0.01 sec)
mysql> select * from employee;
+------+-------+-----------+--------+
| id | name | post | salary |
+------+-------+-----------+--------+
| 1 | mandy | developer | 50000 |
+------+-------+-----------+--------+
1 row in set (0.00 sec)
mysql> INSERT INTO employee values(2,"rohit","tester",40000);
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO employee values(2,"keval","sr. developer",80000);
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO employee values(2,"pravin","sr. developer",100000);
Query OK, 1 row affected (0.01 sec)
mysql> select * from employee;
+------+---------+---------------+--------+
| id | name | post | salary |
+------+---------+---------------+--------+
| 1 | mandy | developer | 50000 |
| 2 | rohit | tester | 40000 |
| 2 | keval | sr. developer | 80000 |
| 2 | pravin | sr. developer | 100000 |
+------+---------+---------------+--------+
4 rows in set (0.00 sec)
mysql> INSERT INTO employee values(3,"keval","sr. developer",80000);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO employee values(4,"pravin","sr. developer",100000);
Query OK, 1 row affected (0.01 sec)
mysql> select * from employee;
+------+---------+---------------+--------+
| id | name | post | salary |
+------+---------+---------------+--------+
| 1 | mandy | developer | 50000 |
| 2 | rohit | tester | 40000 |
| 2 | keval | sr. developer | 80000 |
| 2 | pravin | sr. developer | 100000 |
| 3 | keval | sr. developer | 80000 |
| 4 | atharva | sr. developer | 100000 |
+------+---------+---------------+--------+
6 rows in set (0.00 sec)
mysql> DELETE FROM employee WHERE id=2;
Query OK, 3 rows affected (0.00 sec)
mysql> select * from employee;
+------+---------+---------------+--------+
| id | name | post | salary |
+------+---------+---------------+--------+
| 1 | mandy | developer | 50000 |
| 3 | keval | sr. developer | 80000 |
| 4 | pravin | sr. developer | 100000 |
+------+---------+---------------+--------+
3 rows in set (0.00 sec)
mysql> INSERT INTO employee values(2,"rohit","tester",40000);
Query OK, 1 row affected (0.01 sec)
mysql> select * from employee;
+------+---------+---------------+--------+
| id | name | post | salary |
+------+---------+---------------+--------+
| 1 | mandy | developer | 50000 |
| 3 | keval | sr. developer | 80000 |
| 4 | pravin | sr. developer | 100000 |
| 2 | rohit | tester | 40000 |
+------+---------+---------------+--------+
4 rows in set (0.00 sec)
mysql> SELECT * FROM employee ORDER BY id ASC;
+------+---------+---------------+--------+
| id | name | post | salary |
+------+---------+---------------+--------+
| 1 | mandy | developer | 50000 |
| 2 | rohit | tester | 40000 |
| 3 | keval | sr. developer | 80000 |
| 4 | pravin | sr. developer | 100000 |
+------+---------+---------------+--------+
4 rows in set (0.00 sec)
mysql> SELECT * FROM employee ORDER BY id DSC;
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 'DSC' at line 1
mysql> SELECT * FROM employee ORDER BY id DESC;
+------+---------+---------------+--------+
| id | name | post | salary |
+------+---------+---------------+--------+
| 4 | pravin | sr. developer | 100000 |
| 3 | keval | sr. developer | 80000 |
| 2 | rohit | tester | 40000 |
| 1 | mandy | developer | 50000 |
+------+---------+---------------+--------+
4 rows in set (0.00 sec)
mysql> ALTER table employee add column experience int;
Query OK, 0 rows affected (0.02 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> SELECT * FROM employee ORDER BY id DESC;
+------+---------+---------------+--------+------------+
| id | name | post | salary | experience |
+------+---------+---------------+--------+------------+
| 4 | pravin | sr. developer | 100000 | NULL |
| 3 | keval | sr. developer | 80000 | NULL |
| 2 | rohit | tester | 40000 | NULL |
| 1 | mandy | developer | 50000 | NULL |
+------+---------+---------------+--------+------------+
4 rows in set (0.00 sec)
mysql> SELECT * FROM employee ORDER BY id ASC;
+------+---------+---------------+--------+------------+
| id | name | post | salary | experience |
+------+---------+---------------+--------+------------+
| 1 | mandy | developer | 50000 | NULL |
| 2 | rohit | tester | 40000 | NULL |
| 3 | keval | sr. developer | 80000 | NULL |
| 4 | pravin | sr. developer | 100000 | NULL |
+------+---------+---------------+--------+------------+
4 rows in set (0.00 sec)
mysql> ALTER table employee remove column experience int;
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 'column experience int' at line 1
mysql> ALTER table employee remove column experience;
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 'column experience' at line 1
mysql> ALTER table employee drop column experience;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> select * from employee;
+------+---------+---------------+--------+
| id | name | post | salary |
+------+---------+---------------+--------+
| 1 | mandy | developer | 50000 |
| 3 | keval | sr. developer | 80000 |
| 4 | pravin | sr. developer | 100000 |
| 2 | rohit | tester | 40000 |
+------+---------+---------------+--------+
4 rows in set (0.00 sec)
mysql> ALTER table employee add column experience int;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> ALTER table employee modify column experience varchar(10);
Query OK, 4 rows affected (0.04 sec)
Records: 4 Duplicates: 0 Warnings: 0
mysql> select * from employee;
+------+---------+---------------+--------+------------+
| id | name | post | salary | experience |
+------+---------+---------------+--------+------------+
| 1 | mandy | developer | 50000 | NULL |
| 3 | keval | sr. developer | 80000 | NULL |
| 4 | pravin | sr. developer | 100000 | NULL |
| 2 | rohit | tester | 40000 | NULL |
+------+---------+---------------+--------+------------+
4 rows in set (0.00 sec)
mysql> ALTER table employee rename column experience TO years_worked;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> select * from employee;
+------+---------+---------------+--------+--------------+
| id | name | post | salary | years_worked |
+------+---------+---------------+--------+--------------+
| 1 | mandy | developer | 50000 | NULL |
| 3 | keval | sr. developer | 80000 | NULL |
| 4 | pravin | sr. developer | 100000 | NULL |
| 2 | rohit | tester | 40000 | NULL |
+------+---------+---------------+--------+--------------+
4 rows in set (0.00 sec)
mysql> select post, name from employee where salary>50000;
+---------------+---------+
| post | name |
+---------------+---------+
| sr. developer | keval |
| sr. developer | pravin |
+---------------+---------+
2 rows in set (0.01 sec)
mysql> delete from employee where salary<50000;
Query OK, 1 row affected (0.01 sec)
mysql> select * from employee;
+------+---------+---------------+--------+--------------+
| id | name | post | salary | years_worked |
+------+---------+---------------+--------+--------------+
| 1 | mandy | developer | 50000 | NULL |
| 3 | keval | sr. developer | 80000 | NULL |
| 4 | pravin | sr. developer | 100000 | NULL |
+------+---------+---------------+--------+--------------+
3 rows in set (0.00 sec)