But you can use column aliases in a HAVING clause (a simple mistake when you are typing as fast as you are thinking). The other option is to put the CONCAT(...) into the WHERE clause in place of the alias. Either way, you will absolutely NOT be using an index to search that table. You will need to scan the results of each CONCAT() for each row (at least as long as a full table scan would take).
Shawn Green Database Administrator Unimin Corporation - Spruce Pine "mel list_php" <[EMAIL PROTECTED]> wrote on 03/23/2005 12:24:42 PM: > Unfortunatly I can't use the alias txt in the where clause: > Standard SQL doesn't allow you to refer to a column alias in a WHERE clause. > This is because when the WHERE code is executed, the column value may not > yet be determined. For example, the following query is illegal: > > SELECT id, COUNT(*) AS cnt FROM tbl_name WHERE cnt > 0 GROUP BY id; > > http://dev.mysql.com/doc/mysql/en/problems-with-alias.html > > > > >From: Peter Brawley <[EMAIL PROTECTED]> > >Reply-To: [EMAIL PROTECTED] > >To: [EMAIL PROTECTED] > >CC: mel list_php <[EMAIL PROTECTED]>, mysql@lists.mysql.com > >Subject: Re: search through one/several tables > >Date: Wed, 23 Mar 2005 10:46:10 -0600 > > > >Shawn, Mel > > > > >I am not aware of any SQL dialect that supports a query of the kind you > > >are asking about. If there were such a query it _might_ look something > > >like this > > > > >SELECT <column list> > > >FROM <table reference> > > >WHERE ANY_COLUMN(<column name list>) LIKE <search parameter> > > > >Right, but Mel can emulate your ANY_COLUMN with something like > > > > SELECT CONCAT( col1, ..., colN ) AS txt > > FROM tbl > > WHERE txt LIKE '%foobar%'; > > > >PB > > > >----- > > > >[EMAIL PROTECTED] wrote: > > > >>I am not aware of any SQL dialect that supports a query of the kind you > >>are asking about. If there were such a query it _might_ look something > >>like this > >> > >>SELECT <column list> > >>FROM <table reference> > >>WHERE ANY_COLUMN(<column name list>) LIKE <search parameter> > >> > >>but like I said, I can't think of any SQL server that has a function like > >>ANY_COLUMN() or its equivalent. Sorry! I think you will need to do a > >>column-by-column comparison (especially if you want to use LIKE or RLIKE). > >> > >>Shawn Green > >>Database Administrator > >>Unimin Corporation - Spruce Pine > >> > >>"mel list_php" <[EMAIL PROTECTED]> wrote on 03/23/2005 11:08:56 AM: > >> > >> > >> > >>>I can find the data, I was just wondering if mysql provides a kind of > >>>generic scan of a whole table. > >>> > >>>I could provide an advanced search, and ask the user what kind of info > >>> > >>he > >> > >>>wants to retrieve but I first would like a quickSearch that may retrieve > >>> > >>too > >> > >>>much info but is more intuitive. > >>> > >>>As I said, my first idea was to create a script to go through all my > >>> > >>tables > >> > >>>and scan the relevant columns (I don't want to scan the id keys for > >>>example), but I was just wondering if given a table it is possible to > >>> > >>use > >> > >>>mysql to scan all its columns: > >>>*************************** 1. row *************************** > >>> Table: dbLab > >>>Create Table: CREATE TABLE `dbLab` ( > >>> `labId` tinyint(5) NOT NULL auto_increment, > >>> `name` varchar(50) NOT NULL default '', > >>> `fullName` varchar(250) default NULL, > >>> `adress` varchar(150) NOT NULL default '', > >>> `city` varchar(50) NOT NULL default '', > >>> `country` varchar(50) NOT NULL default '', > >>> `url` varchar(100) NOT NULL default '', > >>> PRIMARY KEY (`labId`) > >>>) TYPE=MyISAM COMMENT='list of partners' > >>>1 row in set (0.00 sec) > >>> > >>>If I search for "Smith" I want to retrieve the name Smith, the fullname > >>>Smith, the address or city containing Smith....basically look for the > >>> > >>word > >> > >>>in all the columns, a shortener for select * from dbLab where name > >>>like'%Smith%' or fullName like '%Smith%' or adress like '%Smith%'..... > >>> > >>>But maybe this is not a good way to do things? > >>> > >>>Melanie > >>> > >>> > >>> > >>> > >>>>From: [EMAIL PROTECTED] > >>>>To: "mel list_php" <[EMAIL PROTECTED]> > >>>>CC: [EMAIL PROTECTED],mysql@lists.mysql.com > >>>>Subject: Re: search through one/several tables > >>>>Date: Wed, 23 Mar 2005 09:55:23 -0500 > >>>> > >>>>"mel list_php" <[EMAIL PROTECTED]> wrote on 03/23/2005 06:00:08 > >>>> > >>AM: > >> > >> > >>>>>Unfortunatly they are not, I have something like 30 tables, with I > >>>>> > >>would > >> > >> > >>>>say > >>>> > >>>> > >>>>>10 to 15 fields per table. > >>>>>The number of row per table is quite low, i think it won't exceed > >>>>>500-1000/table. But I may sometimes have to search into dna > >>>>> > >>sequences > >> > >> > >>>>>(around 5000 atcg characters in any order), so that is quite heavy. > >>>>> > >>>>> > >>>>Maybe > >>>> > >>>> > >>>>>for that field a fulltext index would be helpful? > >>>>> > >>>>>Thanks for your help, > >>>>>Melanie > >>>>> > >>>>> > >>>>> > >>>>> > >>>>>>From: [EMAIL PROTECTED] > >>>>>>To: [EMAIL PROTECTED] > >>>>>>CC: mysql@lists.mysql.com > >>>>>>Subject: Re: search through one/several tables > >>>>>>Date: Wed, 23 Mar 2005 10:44:53 +0000 > >>>>>> > >>>>>>"mel list_php" <[EMAIL PROTECTED]> wrote on 23/03/2005 > >>>>>> > >>10:14:07: > >> > >> > >>>>>>>Hi list, > >>>>>>> > >>>>>>>I would like to search for something into one or several tables. > >>>>>>>My first idea was to retrieve the tables' names, then for each > >>>>>>> > >>of > >> > >> > >>>>them > >>>> > >>>> > >>>>>>>retrieve the columns' name and have a look in each of this > >>>>>>> > >>column. > >> > >> > >>>>>>>Is there a more elegant (fast) way to do that with mysql? > >>>>>>> > >>>>>>>Somebody has some tips/doc where I could look for search > >>>>>>> > >>engines?My > >> > >> > >>>>>>problem > >>>>>> > >>>>>> > >>>>>>>is that I don't have one big table with all the data but several > >>>>>>> > >>>>>>> > >>>>little > >>>> > >>>> > >>>>>>ones > >>>>>> > >>>>>> > >>>>>>>with few fields, so I don't think solutions like Lucene could > >>>>>>> > >>work. > >> > >> > >>>>>>If your tables are all identical, which it sounds like, you want to > >>>>>> > >>>>>> > >>>>create > >>>> > >>>> > >>>>>>a Merge Table: see > >>>>>>http://dev.mysql.com/doc/mysql/en/merge-storage-engine.html > >>>>>> > >>>>>> Alec > >>>>>> > >>>>>>-- > >>>>>>MySQL General Mailing List > >>>>>>For list archives: http://lists.mysql.com/mysql > >>>>>>To unsubscribe: > >>>>>>http://lists.mysql.com/[EMAIL PROTECTED] > >>>>>> > >>>>>> > >>>>>> > >>>>>_________________________________________________________________ > >>>>>Express yourself with cool new emoticons > >>>>> > >>>>> > >>>>http://www.msn.co.uk/specials/myemo > >>>> > >>>> > >>>>>-- > >>>>>MySQL General Mailing List > >>>>>For list archives: http://lists.mysql.com/mysql > >>>>>To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] > >>>>> > >>>>> > >>>>> > >>>>I agree in priciple with Alec. Good database design can and should > >>>> > >>promote > >> > >> > >>>>good data retreival. However, it sounds from your original question > >>>> > >>that > >> > >> > >>>>you need to find all records on any table with some bit of information > >>>> > >>in > >> > >> > >>>>any column. That problem is just too generic to provide specific help > >>>>for. > >>>>If you can't find certain pieces of data, it _may_ be that you haven't > >>>>organized your data to the point that there is a place for everything > >>>> > >>and > >> > >> > >>>>everything is in its place. There is always (except for the most > >>>> > >>trivial > >> > >> > >>>>cases) more than one way to organize any set of data, however different > >>>>schemas offer different advantages (size, speed, ease of use, etc). > >>>> > >>Which > >> > >> > >>>>one will work best for you depends on the nature of your data, your > >>>>database server's limitations (hardware, software, and operating system > >>>>limits), and what you need to get from the data once it's organized. > >>>> > >>Some > >> > >> > >>>>schemas make it harder to add or update data but make finding it a > >>>> > >>breeze; > >> > >> > >>>>others are just the opposite. This sounds like a good time to honestly > >>>>review your current schema to make sure it's going to meet your usage > >>>>needs not just your data storage requirements. Ask the people who need > >>>> > >>to > >> > >> > >>>>use the data you are storing what they need to find and adjust your > >>>>schemas to fit. Sometimes it means asking them to look by using a > >>>>different method as a compromise (you give a little, they give a > >>>> > >>little). > >> > >> > >>>>Eventually you can work it out. > >>>> > >>>>If you have a schema design issue or if you have a more specific set of > >>>>tables (please post their SHOW CREATE TABLE... results) and a sample > >>>> > >>query > >> > >> > >>>>that you cannot solve (even if it's only a description of what you need > >>>> > >>to > >> > >> > >>>>find), I am sure the list will be happy to help. Many of us really > >>>> > >>enjoy > >> > >> > >>>>those kinds of puzzles. > >>>> > >>>>Shawn Green > >>>>Database Administrator > >>>>Unimin Corporation - Spruce Pine > >>>> > >>>> > >>>> > >>>_________________________________________________________________ > >>>Stay in touch with absent friends - get MSN Messenger > >>>http://www.msn.co.uk/messenger > >>> > >>> > >>> > >> > >> > >> > >>------------------------------------------------------------------------ > >> > >>No virus found in this incoming message. > >>Checked by AVG Anti-Virus. > >>Version: 7.0.308 / Virus Database: 266.8.1 - Release Date: 3/23/2005 > >> > >> > >No virus found in this outgoing message. > >Checked by AVG Anti-Virus. > >Version: 7.0.308 / Virus Database: 266.8.1 - Release Date: 3/23/2005 > > > >-- > >MySQL General Mailing List > >For list archives: http://lists.mysql.com/mysql > >To unsubscribe: > >http://lists.mysql.com/[EMAIL PROTECTED] > > _________________________________________________________________ > Want to block unwanted pop-ups? Download the free MSN Toolbar now! > http://toolbar.msn.co.uk/ > > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] >
