Difference between revisions of "SQL Relational operators"
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==Purpose== | ==Purpose== | ||
Relational Operators | Relational Operators | ||
Line 67: | Line 60: | ||
==Example== | ==Example== | ||
<code lang="recital"> | <code lang="recital"> | ||
− | + | SELECT name, address, balance, cost*1.15; | |
− | SELECT name, address, balance, cost*1.15 | + | FROM accounts; |
− | FROM accounts | + | WHERE paid_date = date(); |
− | WHERE paid_date = date() | + | ORDER BY name, paid_date |
− | ORDER BY name, paid_date | + | |
− | + | SELECT name, address, balance, cost*1.15; | |
− | SELECT name, address, balance, cost*1.15 | + | FROM accounts; |
− | FROM accounts | + | WHERE paid_date <= date(); |
− | WHERE paid_date <= date() | + | ORDER BY name, paid_date |
− | ORDER BY name, paid_date | + | |
− | + | SELECT name, address, balance, cost*1.15; | |
− | SELECT name, address, balance, cost*1.15 | + | FROM accounts; |
− | FROM accounts | + | WHERE paid_date <> date(); |
− | WHERE paid_date <> date() | + | ORDER BY name, paid_date |
− | ORDER BY name, paid_date | + | |
− | + | SELECT name, address, balance, cost*1.15; | |
− | SELECT name, address, balance, cost*1.15 | + | FROM accounts; |
− | FROM accounts | + | WHERE name == "%inc%"; |
− | WHERE name == "%inc%" | + | ORDER BY name, paid_date |
− | ORDER BY name, paid_date | + | |
− | + | SELECT name, address, balance, cost*1.15; | |
− | SELECT name, address, balance, cost*1.15 | + | FROM accounts; |
− | FROM accounts | + | WHERE name | "inc"; |
− | WHERE name | "inc" | + | ORDER BY name, paid_date |
− | ORDER BY name, paid_date | + | |
− | + | SELECT name, address, balance, cost*1.15; | |
− | SELECT name, address, balance, cost*1.15 | + | FROM accounts; |
− | FROM accounts | + | WHERE name $ "BigCo inc, BigCo plc"; |
− | WHERE name $ "BigCo inc, BigCo plc" | + | ORDER BY name, paid_date |
− | ORDER BY name, paid_date | + | |
</code> | </code> | ||
==Products== | ==Products== | ||
− | Recital | + | Recital, Recital Server |
[[Category:Documentation]] | [[Category:Documentation]] | ||
− | [[Category:SQL | + | [[Category:SQL|Operators,Relational]] |
− | + |
Latest revision as of 15:50, 5 July 2011
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
Products
Recital, Recital Server