Difference between revisions of "SQL Relational operators"

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|$||True if <expression1> is a sub string of <expression2>.  Both <expression1> and <expression2>must be character strings.
 
|$||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.
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|<nowiki>|</nowiki>||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.
 
|==||True if <expression1> and <expression2> match, otherwise False.  Both <expression1> and <expression2>must be character strings.  The <expression2> can contain the wildcards below.
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{| class="wikitable"
 
{| class="wikitable"
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!_||Any single character
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|_||Any single character
 
|-
 
|-
 
|%||Zero or more characters
 
|%||Zero or more characters

Revision as of 12:52, 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:


_ 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

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