SQL Relational operators

Purpose

Relational Operators

Syntax

<expression1> operator <expression2>

See Also

INSERT, SQL OPERATORS, SELECT, UPDATE

Description

Relational Operators compare two expressions and evaluate to either True or False.

Operator	Description
=	True if <expression1> and <expression2> are equal, otherwise False
<	True if <expression1> is less than <expression2>, otherwise False
<=	True if <expression1> is less than or equal to <expression2>, otherwise False
>	True if <expression1> is greater than the <expression2>, otherwise False
>=	True if <expression1> is greater than or equal to <expression2>, otherwise False
<>	True if <expression1> and <expression2> are not equal, otherwise False
!=	True if <expression1> and <expression2> are not equal, otherwise False
#	True if <expression1> and <expression2> are not equal, otherwise False
$	True if <expression1> is a sub string of <expression2>. Both <expression1> and <expression2>must be character strings.
|	True if <expression2> is a sub string of <expression1>. Both <expression1> and <expression2>must be character strings.
==	True if <expression1> and <expression2> match, otherwise False. Both <expression1> and <expression2>must be character strings. The <expression2> can contain the wildcards below.

Wildcards for == pattern matching:

Operator	Description
_	Any single character
%	Zero or more characters

Example

SELECT name, address, balance, cost*1.15;
FROM accounts;
WHERE paid_date = date();
ORDER BY name, paid_date
 
SELECT name, address, balance, cost*1.15;
FROM accounts;
WHERE paid_date <= date();
ORDER BY name, paid_date
 
SELECT name, address, balance, cost*1.15;
FROM accounts;
WHERE paid_date <> date();
ORDER BY name, paid_date
 
SELECT name, address, balance, cost*1.15;
FROM accounts;
WHERE name == "%inc%";
ORDER BY name, paid_date
 
SELECT name, address, balance, cost*1.15;
FROM accounts;
WHERE name | "inc";
ORDER BY name, paid_date
 
SELECT name, address, balance, cost*1.15;
FROM accounts;
WHERE name $ "BigCo inc, BigCo plc";
ORDER BY name, paid_date