1. Topic - DML - Select statement
Objective: 1) Understand the purpose of ‘select’ command and able to write query using ‘SELECT’ 2) Understand and use relational and logical operators in ‘select’ statement

2. DML - Select statement Purpose - > Used to get data from database.
Syntax
Select <attribute list separated with comma> from <table name> where <condition>;

3. Select clause Ex: 1)Select * from employee;
OUTPUT-1 ID
NAME
SALARY 1
ARUN
6000 2
VARUN
8000 3
ALI
9000 4
GEORGE
12000 5
MOHD
Ex: 1)Select * from employee;
2)Select id,name from employee;
TABLE - EMPLOYEE
OUTPUT-2 ID
NAME
SALARY 1
ARUN
6000 2
VARUN
8000 3
ALI
9000 4
GEORGE
12000 5
MOHD ID
NAME 1
ARUN 2
VARUN 3
ALI 4
GEORGE 5
MOHD

4. Ex: 1) Select salary from employee;
Select clause
TABLE - EMPLOYEE
OUTPUT -1
OUTPUT -2 ID
NAME
SALARY 1
ARUN
6000 2
VARUN
8000 3
ALI
9000 4
GEORGE
12000 5
MOHD
SALARY
6000
8000
9000
12000
SALARY
6000
8000
9000
12000
Ex: 1) Select salary from employee;
2) Select distinct salary from employee;

5. Operators used in ‘Where ‘clause
1. Relational Operators
>
>=
<
< = =
<>
Greater than
Greater than or equal to
Less than
Less than or equal to
Equal to
Not equal to

6. Relational Operators used in ‘Where ‘clause
Output-3
TABLE - EMPLOYEE
Output-1
Output-2
NAME
ARUN
ALI
GEORGE ID
NAME
SALARY 1
ARUN
6000 2
VARUN
8000 3
ALI
9000 4
GEORGE
12000 5
MOHD ID
NAME 1
ARUN ID
NAME
SALARY 3
ALI
9000 4
GEORGE
12000
Ex. 1) Select id,name from employee where id=1;
2) Select * from employee where salary>8000;
3) Select name from employee where salary < >8000;

7. Logical Operators used in ‘Where ‘clause
AND OR
NOT
Used when both the conditions should be satisfied
Used when any one of the conditions should be satisfied
Used to consider the condition opposite to the given one.

8. Logical Operators used in ‘Where ‘clause
Output-3
TABLE - EMPLOYEE
Output-1
Output-2 ID
NAME
SALARY 1
ARUN
6000 2
VARUN
8000 3
ALI
9000 4
GEORGE
12000 5
MOHD ID
NAME 3
ALI ID
NAME 1
ARUN 4
GEORGE ID
NAME 3
ALI 4
GEORGE
Ex. 1) Select id,name from employee where salary>8000 AND salary<12000;
2) Select id,name from employee where salary>9000 OR salary<8000;
3) Select id,name from employee where NOT salary<9000;