Re: where clause structures
On 19 Aug 2002, at 9:36, Aleksandar Bradaric wrote:
> It's that OR that makes the mess. Try with:
>
> -> WHERE CompanyDetails.CompanySuspended='0' AND
> -> CompanyDNSZones.ZoneName='megalan.co.za' AND
> -> (CompanyDNSZones.ZoneServices LIKE '%HasMail%' OR
> -> CompanyDNSZones.ZoneServices LIKE '%HasMailingList%');
Since any string that contains 'HasMailingList' also contains
'HasMail', there's no point in adding the last bit. This should return
the same results more efficiently:
WHERE CompanyDetails.CompanySuspended='0' AND
CompanyDNSZones.ZoneName='megalan.co.za' AND
CompanyDNSZones.ZoneServices LIKE '%HasMail%';
If it's necessary to distinguish between 'HasMail' and 'HasMailingList'
(as it presumably would be in other queries), then you can't use LIKE.
Use FIND_IN_SET() instead (or rename the set elements):
WHERE CompanyDetails.CompanySuspended='0' AND
CompanyDNSZones.ZoneName='megalan.co.za' AND
( FIND_IN_SET('HasMail', CompanyDNSZones.ZoneServices) OR
FIND_IN_SET('HasMailList', CompanyDNSZones.ZoneServices) );
Another possibility is to do bit operations on the set. In this case,
HasMail is 1 and HasMailingList is 2, so the criteria should be
WHERE CompanyDetails.CompanySuspended='0' AND
CompanyDNSZones.ZoneName='megalan.co.za' AND
CompanyDNSZones.ZoneServices & 3;
[Filter fodder: SQL]
--
Keith C. Ivey <[EMAIL PROTECTED]>
Tobacco Documents Online
http://tobaccodocuments.org
-
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Re: where clause structures
Hi, -> WHERE CompanyDetails.CompanySuspended='0' AND -> CompanyDNSZones.ZoneName='megalan.co.za' AND -> CompanyDNSZones.ZoneServices LIKE '%HasMail%' OR -> CompanyDNSZones.ZoneServices LIKE '%HasMailingList%'; > I explictly tell MySQL in my where clause to only return results where > CompanyDNSZones.ZoneName='megalan.co.za', so where does it fall out > returning lists.megalan.co.za as well? It's that OR that makes the mess. Try with: -> WHERE CompanyDetails.CompanySuspended='0' AND -> CompanyDNSZones.ZoneName='megalan.co.za' AND -> (CompanyDNSZones.ZoneServices LIKE '%HasMail%' OR -> CompanyDNSZones.ZoneServices LIKE '%HasMailingList%'); Regards, Sasa »mysql, select, database« - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
where clause structures
try this:
selectwhere WHATEVER LIKE 'whatever%'
notice the '%' at the end not the beginning...hope this is what you
wanted...
lekker dag verder boet.
- Original Message -
From: "Chris Knipe" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, August 18, 2002 5:54 AM
Subject: Re: where clause structures
EEK
Tables structures :P
mysql> describe CompanyDetails;
+---+---+--+-+-+
+
| Field | Type | Null | Key | Default |
Extra |
+---+---+--+-+-+
+
| CompanyID | tinyint(4) unsigned | | PRI | NULL|
auto_increment |
| CompanyActive | enum('1','0') | | MUL | 0 |
|
| CompanySuspended | enum('0','1','2','3','4','5') | | MUL | 0 |
|
mysql> describe CompanyDNSZones;
+--+
---+--+-+-++
| Field| Type
| Null | Key | Default | Extra |
+--+
---+--+-+-++
| ZoneID | int(11)
| | PRI | NULL| auto_increment |
| CompanyID| smallint(6)
| | MUL | 0 ||
| ZoneName | varchar(250)
| | UNI | ||
| ZoneServices |
set('HasMail','HasMailingList','HasBackupMail','IsMegaDNS','IsSecondary') |
| MUL | | |
- Original Message -
From: "Chris Knipe" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, August 17, 2002 11:44 PM
Subject: where clause structures
> Lo everyone,
>
> I seem to be having a problem with the structuring of my query - more
> specifically, with the WHERE clause...
>
> mysql> SELECT ZoneName
> -> FROM CompanyDNSZones
> -> LEFT JOIN CompanyDetails ON
> CompanyDetails.CompanyID=CompanyDNSZones.CompanyID
> -> WHERE CompanyDetails.CompanySuspended='0' AND
> -> CompanyDNSZones.ZoneName='megalan.co.za' AND
> -> CompanyDNSZones.ZoneServices LIKE '%HasMail%' OR
> -> CompanyDNSZones.ZoneServices LIKE '%HasMailingList%';
> +-+
> | ZoneName|
> +-+
> | megalan.co.za |
> | lists.megalan.co.za |
> +-+
> 2 rows in set (0.01 sec)
>
> How do I get it to only return the item specified in the WHERE clause?
>
> I explictly tell MySQL in my where clause to only return results where
> CompanyDNSZones.ZoneName='megalan.co.za', so where does it fall out
> returning lists.megalan.co.za as well?
>
> --
> me
>
> PS: Just for interest takes, can LEFT / RIGHT / a combination of LEFT &
> RIGHT joins be used to cross-reference three or more tables, or is it
> limited to 2 tables only?
>
>
>
>
> -
> Before posting, please check:
>http://www.mysql.com/manual.php (the manual)
>http://lists.mysql.com/ (the list archive)
>
> To request this thread, e-mail <[EMAIL PROTECTED]>
> To unsubscribe, e-mail
<[EMAIL PROTECTED]>
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>
>
-
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Re: where clause structures
EEK
Tables structures :P
mysql> describe CompanyDetails;
+---+---+--+-+-+
+
| Field | Type | Null | Key | Default |
Extra |
+---+---+--+-+-+
+
| CompanyID | tinyint(4) unsigned | | PRI | NULL|
auto_increment |
| CompanyActive | enum('1','0') | | MUL | 0 |
|
| CompanySuspended | enum('0','1','2','3','4','5') | | MUL | 0 |
|
mysql> describe CompanyDNSZones;
+--+
---+--+-+-++
| Field| Type
| Null | Key | Default | Extra |
+--+
---+--+-+-++
| ZoneID | int(11)
| | PRI | NULL| auto_increment |
| CompanyID| smallint(6)
| | MUL | 0 ||
| ZoneName | varchar(250)
| | UNI | ||
| ZoneServices |
set('HasMail','HasMailingList','HasBackupMail','IsMegaDNS','IsSecondary') |
| MUL | ||
- Original Message -
From: "Chris Knipe" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, August 17, 2002 11:44 PM
Subject: where clause structures
> Lo everyone,
>
> I seem to be having a problem with the structuring of my query - more
> specifically, with the WHERE clause...
>
> mysql> SELECT ZoneName
> -> FROM CompanyDNSZones
> -> LEFT JOIN CompanyDetails ON
> CompanyDetails.CompanyID=CompanyDNSZones.CompanyID
> -> WHERE CompanyDetails.CompanySuspended='0' AND
> -> CompanyDNSZones.ZoneName='megalan.co.za' AND
> -> CompanyDNSZones.ZoneServices LIKE '%HasMail%' OR
> -> CompanyDNSZones.ZoneServices LIKE '%HasMailingList%';
> +-+
> | ZoneName|
> +-+
> | megalan.co.za |
> | lists.megalan.co.za |
> +-+
> 2 rows in set (0.01 sec)
>
> How do I get it to only return the item specified in the WHERE clause?
>
> I explictly tell MySQL in my where clause to only return results where
> CompanyDNSZones.ZoneName='megalan.co.za', so where does it fall out
> returning lists.megalan.co.za as well?
>
> --
> me
>
> PS: Just for interest takes, can LEFT / RIGHT / a combination of LEFT &
> RIGHT joins be used to cross-reference three or more tables, or is it
> limited to 2 tables only?
>
>
>
>
> -
> Before posting, please check:
>http://www.mysql.com/manual.php (the manual)
>http://lists.mysql.com/ (the list archive)
>
> To request this thread, e-mail <[EMAIL PROTECTED]>
> To unsubscribe, e-mail
<[EMAIL PROTECTED]>
> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
>
>
-
Before posting, please check:
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http://lists.mysql.com/ (the list archive)
To request this thread, e-mail <[EMAIL PROTECTED]>
To unsubscribe, e-mail <[EMAIL PROTECTED]>
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where clause structures
Lo everyone, I seem to be having a problem with the structuring of my query - more specifically, with the WHERE clause... mysql> SELECT ZoneName -> FROM CompanyDNSZones -> LEFT JOIN CompanyDetails ON CompanyDetails.CompanyID=CompanyDNSZones.CompanyID -> WHERE CompanyDetails.CompanySuspended='0' AND -> CompanyDNSZones.ZoneName='megalan.co.za' AND -> CompanyDNSZones.ZoneServices LIKE '%HasMail%' OR -> CompanyDNSZones.ZoneServices LIKE '%HasMailingList%'; +-+ | ZoneName| +-+ | megalan.co.za | | lists.megalan.co.za | +-+ 2 rows in set (0.01 sec) How do I get it to only return the item specified in the WHERE clause? I explictly tell MySQL in my where clause to only return results where CompanyDNSZones.ZoneName='megalan.co.za', so where does it fall out returning lists.megalan.co.za as well? -- me PS: Just for interest takes, can LEFT / RIGHT / a combination of LEFT & RIGHT joins be used to cross-reference three or more tables, or is it limited to 2 tables only? - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
