Comparison
Condition Operators:
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Comparison Condition Operators
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Description
|
|
=
|
Equal to
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<>
|
Not equal to
|
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>
|
Greater than
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>=
|
Greater than or equal
to
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<
|
Less than
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<=
|
Less than or equal to
|
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SELECT first_name, last_name, salary
FROM employees
WHERE salary>=5000;
|
Result
of the above query is as shown below:
Special
Condition Comparison Operators:
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Special Comparison Condition Operators
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Description
|
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BETWEEN…AND…
|
Inclusive between two
values
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IN(set)
|
Match any of the
values in set
|
|
LIKE
|
Match a character
pattern
|
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IS NULL
|
Check NULL value true
or false
|
BETWEEN…AND… operator:
This
operator selects all the values mention within (BETWEEN… AND… )range. Both starting
and ending values are inclusive while selection.
Let’s
see a simply example using this operator:
|
SELECT first_name, salary
FROM employees
WHERE salary BETWEEN 6000 AND
12000;
|
Result
of the above query is as shown below:
IN(set) operator:
This
operator filters data with all the values present in the set of IN operator.
|
SELECT department_id, first_name, salary
FROM employees
WHERE salary IN (10,20,60,70,90);
|
Result
of the above query is as shown below:
LIKE operator:
This
operator matches character patterns. The patterns may contain literal
characters or numbers.
Below
two special characters can be used with search pattern:
|
%
|
Denotes zero or many character
|
|
_(underscore)
|
Denotes one character
|
Below
is the example query which displays results of employees whose first name
starts with letter A.
|
SELECT department_id, first_name, salary
FROM employees
WHERE first_name LIKE ‘A%’;
|
Result
of the above query is as shown below:
Let’s
see an example combing both % and _ in filter condition. The below query will
display the results of only those employees whose second letter in their first
name will be ‘e’.
|
SELECT department_id, first_name, salary
FROM employees
WHERE first_name LIKE '_e%';
|
Result
of the above query is as shown below:
IS NULL operator:
It
displays all the records whose value is NULL.
//next
post will be on LOGICAL operators, combing all the operators together to get
more desired result and ORDER by clause. Stayed Tuned by LIKING blog’s fan page
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