Conditional selection & operation
CONDITIONAL SELECTIONS AND OPERATORS
We have two clauses used in this
Ø Where
Ø Order by
USING WHERE
Syntax:
select * from <table_name> where <condition>;
the following are the different types of operators used in where clause.
v Arithmetic operators
v Comparison operators
v Logical operators
v Arithmetic operators -- highest precedence
+, -, *, /
v Comparison operators
Ø =, !=, >, <, >=, <=, <>
Ø between, not between
Ø in, not in
Ø null, not null
Ø like
v Logical operators
Ø And
Ø Or -- lowest precedence
Ø not
a) USING =, >, <, >=, <=, !=, <>
Ex:
SQL> select * from student where no = 2;
NO NAME MARKS
--- ------- ---------
2 Saketh 200
2 Naren 400
SQL> select * from student where no < 2;
NO NAME MARKS
--- ------- ----------
1 Sudha 100
1 Jagan 300
SQL> select * from student where no > 2;
NO NAME MARKS
--- ------- ----------
3 Ramesh
4 Madhu
5 Visu
6 Rattu
SQL> select * from student where no <= 2;
NO NAME MARKS
--- ------- ----------
1 Sudha 100
2 Saketh 200
1 Jagan 300
2 Naren 400
SQL> select * from student where no >= 2;
NO NAME MARKS
--- ------- ---------
2 Saketh 200
2 Naren 400
3 Ramesh
4 Madhu
5 Visu
6 Rattu
SQL> select * from student where no != 2;
NO NAME MARKS
--- ------- ----------
1 Sudha 100
1 Jagan 300
3 Ramesh
4 Madhu
5 Visu
6 Rattu
SQL> select * from student where no <> 2;
NO NAME MARKS
--- ------- ----------
1 Sudha 100
1 Jagan 300
3 Ramesh
4 Madhu
5 Visu
6 Rattu
b) USING AND
This will gives the output when all the conditions become true.
Syntax:
select * from <table_name> where <condition1> and <condition2> and .. <conditionn>;
Ex:
SQL> select * from student where no = 2 and marks >= 200;
NO NAME MARKS
--- ------- --------
2 Saketh 200
2 Naren 400
c) USING OR
This will gives the output when either of the conditions become true.
Syntax:
select * from <table_name> where <condition1> and <condition2> or .. <conditionn>;
Ex:
SQL> select * from student where no = 2 or marks >= 200;
NO NAME MARKS
--- ------- ---------
2 Saketh 200
1 Jagan 300
2 Naren 400
d) USING BETWEEN
This will gives the output based on the column and its lower bound, upperbound.
Syntax:
select * from <table_name> where <col> between <lower bound> and <upper bound>;
Ex:
SQL> select * from student where marks between 200 and 400;
NO NAME MARKS
--- ------- ---------
2 Saketh 200
1 Jagan 300
2 Naren 400
e) USING NOT BETWEEN
This will gives the output based on the column which values are not in its lower bound,
upperbound.
Syntax:
select * from <table_name> where <col> not between <lower bound> and <upper bound>;
Ex:
SQL> select * from student where marks not between 200 and 400;
NO NAME MARKS
--- ------- ---------
1 Sudha 100
f) USING IN
This will gives the output based on the column and its list of values specified.
Syntax:
select * from <table_name> where <col> in ( value1, value2, value3 … valuen);
Ex:
SQL> select * from student where no in (1, 2, 3);
NO NAME MARKS
--- ------- ---------
1 Sudha 100
2 Saketh 200
1 Jagan 300
2 Naren 400
3 Ramesh
g) USING NOT IN
This will gives the output based on the column which values are not in the list of values
specified.
Syntax: