Difference between revisions of "SQL Relational operators"

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Revision as of 15:30, 13 March 2009

SQL RELATIONAL OPERATORS

Class

SQL Applications


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

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


Products

Recital Database Server, Recital Mirage Server, Recital Terminal Developer