MYSQL :: Is It Possible To Check For The First Chars In A Db

Check If Column Exists
I want to check if a column exists in a select statement. I've done searches on google and have not found what I need.

If a column exists, include the column in the query, else not. Here's an example of what I might want to do, but it doesn't work:

select cat_title, if(column_exists('subhead')) then subhead from wf_category where cat_id=5

I know I can do a separate select statement to check for this, but I'd rather save the overhead and do it all in one statement.

CHECK CONSTRAINT On A Column
I am not familiar with MySQL, but we are currently looking at it. Currently our software product supports Oracle, DB2, and we want to see what it takes to also include MySQL.

One stumbling block we have come across is that it seems that the CREATE TABLE command does not support the CHECK CONSTRAINT on a column. I know there is such a thing as the ENUM column in MySQL, but what if we want to set the constraint between two values.

Example:

CREATE TABLE TMPTABLE
COLONE CHAR(10),
COLTWO INT CHECK (COLTWO BETWEEN 1 AND 200)....

Is there such a thing in MySQL.

Data Integrity Check On Column
I have a column on a table that I edit from a 'Lookup' table that consists of the values I wish to use. How can I ensure that if a new record is added or if a record is updated that only the values within this lookup table be used?

Also if possible i'd like to ensure that all records are updated if one of the values within the lookup table are changed so for example if I have 3 records and the department column for these records is using values from a lookup table and say these 3 records point to 'DepartmentA'. I'd like to be able to change 'DepartmentA' in lookup table to 'DepartmentB' and have these records automaticly reflect this change. Can I do this?

How To Check For Date/time Ranges Within Record (check For Schedule Conflicts)
You want to check scheduling conflicts and you have a record like:

appointments(table):
apptID
beginningDate
endingDate
beginningTime
endingTime

It's easy enough to check if a time is within that record. Say you want to
check if 8:00am to 10:00am is available, you would use this:

SELECT apptID
FROM appointments
WHERE (beginningDate = '2006-01-19' OR endingDate = '2006-01-19')
AND ('08:00:00' BETWEEN beginningTime AND endingTime
OR '10:00:00' BETWEEN beginningTime AND endingTime)

BUT, what if you have an all-day appointment (8:00am to 5:00pm) and there
exists an appointment already scheduled from 10:00am to 11:00am. The above
query would not find it.

Another question is what if the appointment is more than two days. Say, it's
from Monday - Wednesday from 8am to 5pm. The above query would not
successfully catch it if you wanted to schedule an appointment on Tuesday.

(I might be able to generate a date range using PHP, don't know if that's
the best way)

Chars
How to define chars wich starts and ends string in table column. I have column varchar(10) and I try to search table with regexp but I dont have result because I dont know how to define char wich is before and after string. Everything works with like %variable% but i want to searching be more efective.

Chars
How to define chars wich starts and ends string in table column.
I have column varchar(10) and I try to search table with regexp
but I dont have result because I dont know how to define char wich is
before and after string. Everything works with like %variable% but i want to
searching be more efective.

Hex Instead Of Chars
I need to write a little Windows utility in C++ to retrieve data from a
mysql database that belongs to a Linux backup program called Bacula. The
data I am getting consists of hex values where I would have expected a
character string e.g. instead of Abcd I get 41626364. Something to do with
Unicode I expect but I can't find out how to deal with it.

1 - 2 Chars
Our fulltext index is setup to handle 3 char min_length. However, our visitors need to be able to search for certain 1-2 char phrases. In somewhere like Google I could type the phrase in quotes and get results but even with boolean syntax enabled in MySQL I still get invalid or no results for the likes of "u are u" or "PS 2".
Is there a workaround aside from massively bloating our fulltext index by lowering the min_length further?

What Holds More Than 255 Chars?
right now I have a column on my data-base that is VARCHAR and holds a max of 255 characters. I need to hold more than that, but im not sure what kind of field it needs to be?

also if I change the the field type from VARCHAR to whatever it needs to be...will it mess up all the data I already have in that field?

Cpecial Chars
My php form write data using addsleshes to Mysql database (if someone write ' or " in database stays ' or ").
And now problem:
How can I use special chars (" or ') in ,,like,, query?
In command prompt I'm accessing to Mysql server and when I do select * I can see, for example, that word Rock' is supstitude with Rock' and that is OK. But I can't define like query with quotation mark (') which result with Rock' :
select * from table where name like '%ock'%' - return quotation error
select * from tabela where naziv like '%ock'%' - nreturn Empty set

Chinese Chars OK
I have mysql 5 and php 5.1.2 with chinese chars in utf8 on mysql.
Browsing the tables in phpmyadmin shows correct chinese characters.
However, a custom php page to display them shows only ???

At the top of my php page I did include:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
dir="ltr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

8 Bits Chars
i am reciving an 8bit string which until today i inserted it into the mysql with smal problem of the letter mixing.
now i have a jar which helps me to fix the mixing problem!
for that i open a frame and use a font that i have recived in a jar :

jf = new JFrame(); label2 = new JLabel("000"); label2.setSize(30, 300); label2.setFont(Font.decode("Web Hebrew AD")); jf.getContentPane().add(label2); jf.pack(); jf.setVisible(true);

his do correct the mixing problem but when i try to insert it into the mysql i get only ?

SELECT Only First 20 Chars
If this is a really simple question I apologise. I'm almost certain there is a way to do this, I just can't find it out.I want to SELECT the first 20 characters in a column using a SELECT query. eg. if the column contains a really long text entry then all I want is the first 20 characters to be returned by the query. If less than 20, obviously I want it aswell.

Longer Than 255 Chars
I am here trying to learn MySQL and I have a freewebhost so I'm here just running a bunch of queries through its PHPmyAdmin, still learning..
I am wondering.. How do databases like this forum store values into columns (i suppose?) that are longer than 255 characters? or am I missing something here, I probably am.. can someone shed some light?
edit:Oh Nevermind. Just found out about 'text' online somewhere else.. yeah i thought something like that existed.. read a while back.. Hey does anyone know of any good up-to-date MySQL resource pages?

String With 6 Chars
i have colums with FULLTEXT keys, and performing search by selecting from table with MATCH AGAINST. Now, my ft_min_word_length is set to 4 (and my provider "can't" change it). I understand i can't search for words with length less than 4, but why doesn't mysql server consider "AB-123" as word with 6 chars.
I have entries in my table like, "AB-123", and let's say "AB-1234".
if I search for "AB-123" it returns nothing, if i search for "ab-1243" it select right row

Problems With Special Chars
I had to move from my hosting and I needed to export my MySQL databases.
I did it via the phpmyadmin panel, imported via shell to the new host and everything ran smooth.
However, I found some problems when special characters: instead of Ã¡, it converted as %a, and so on.

I found out that all the special characters were "lost" in the migration proccess, but luckily all of them follow the same pattern: Ã¡ became %a, Ã© became %e... so it should be easy to do a massive replacement.
My question is: what kind of script/query do I have to do in order to fix these special characters on the fly? (I already thought about the possibility of exporting it again to a .sql file, replace it with a text editor and reimport it again, but the database is so big (1200mb), and usage is very high so I'd prefer to do this "on the fly" with a script and UPDATE queries, if possible)

Non Alphanumeric Chars Appearing As ?
I have a site which pulls content from a mysql database. Any non-alphanumeric character is displayed as a question mark. I noticed in phpmyadmin the collation was latin1_swedish_ci and thought this may be something to do with it.

Can anyone confirm this for me? If this is the case, what should the collation be and how do I change it?

Include Any Chars From [0-9] In Like Query
Im trying to write a like query:

select * from table1 where column1 like 'abc[0-9]%'
(I realize this syntax isnt correct)

I want to include any chars from 0-9 in that spot... Does anyone know how to do this?

Special Chars After Upgrade
after upgrading my MySQL-DB from version 3.23 to 4.1.1 on a Linux machine, I can't type section symbols(§) in the MySQL monitor any more.

Store More Chars In A Field
Is there a way to store say 2000 charecters in a field? I thought varchar is limited to 255, but I would like to store about 2000-3000. What field type would accomidate that, if any? Or do I need to write text files?

Filtering Special-chars
I want to fetch the page via php from a mysql-db, which is called by an
emulated filename (mod_rewrite, but that might be unimportant).
So I have a file, which is called by guestbook.html - so I have to find the entry
in my db, where the page title is guestbook. But there isn't a only column for
this virtual filenames, but only entries like "Guestbook", "This & much
more..." and so on.

Becaus I'm not able to use "This & much more..." or thinks like this as
filenames, I have first have to bring the letters to lower case and then to filter
all the special chars. but how can i do this?

because it is for a german cms, I first translate ä,ö,ü,ß

my current solution (whitout replacing special chars) is this:

WHERE
REPLACE (
REPLACE (
REPLACE (
REPLACE (
LOWER( pagetitle ) ,
'ö', 'oe'),
'ä', 'ae'),
'ü','ue'),
'ß','ss') LIKE 'guestbook'

the column pagetitle has in one entry the value "Guestbook" - but how can i
find a entry "This & much more..." - how to delete whitespaces, &, . and the
other chars that are not numbers or digits?

doing this at reading from the db has the benefit that I don't have to do so
many hacks in the cms as when I would do it at inserting. The problem of the
performance might be not so heavy (if I wouldnt have to use much more
Replace (...)), becaus the cms is just for small pages which are hosted on
shared hosting servers.

SELECTing WHEN Chars >= 4000
I have a table of articles, and each article has a "chars" field storing the number characters it has. There are two kinds of SELECTs I'm looking to do:

1: Select until @var >= 4000. So MySQL would select a row, increment the variable by 'chars', and then check to see if it's >= 4000 before continuing.

2: Select five rows that appear AFTER the first 4000 characters. So, five rows after whatever rows were selected in #1.

Is this sort of thing doable in a query, without the use of PHP? If not, then oh well. The problem is that I'm doing the first query by selecting 10 rows, then using PHP to go through and get 4000 characters, then discard the rest. Then, and here's the bugger, I cache the output. Later on the page, I show five "most recent" articles using a variable set in the now-cached output to tell the query at which row to start pulling (WHERE id <= $last_id). When the first bit's been cached, the script doesn't run and the variable isn't then. Then the next bit on the page just errors out because it has nothing to go on.

Count Chars In Field
I need to know how to select from a field where the total number of chars in the field is less than 5.

Chars In Mysql Query
If a user search for a word like 'caño' he gets results containing both 'caño' and 'cano'.
I don't want to extend searches in words with 'n' instead of 'ñ'.
But I also want to keep such extension when a user is looking for a word with an ' á ' , results contain both ' a ' and ' á '

Getting Records Based On Chars In A String
I have a table with 2 fields. Field 1 contains Names. Field 2 contains a single character A,B,C,D or E.

I have a string "BCE" for which I want all the names that contain one of those characters (B,C, or E). For Example:

Field1
======
Jo
Ron
Mary
Sue
Mark
Frank

Field 2
=======
E
D
A
C
D
B

Desired Result after Query:
===========================
Frank
Sue
Jo

SELECT * from TestTable Where Field2 = SomeFunction("BCE")

How can I do this using a SELECT statement?

Table Words With Special Chars
Using Perl v5.8.5 + MySQL v4.1.9 on Linux FC2.

I'm trying to parse a UTF-8 document (<?xml version="1.0" encoding="UTF-8"?>),
and store it into a MySQL database (Collation: utf8_bin).

The document contains special characters ('mÃºsica espaÃ±ola' for instance), and
after storing it into de DB, I get this word: "mÃƒÂºsica espaÃƒÂ±ola"

How can I store words with special characters

Preoblemwith Displaying Utf8 Chars In Web Site
I have the following problem: I have a database entries with cyrillic characters and I cannot display them in my website (instead I get "?????"). I have set the files for the website in utf-8 character encoding and all the static characters in the web site are show as they should. The according table is in utf8_general_ci encoding and all the system character-/collation- variables are in utf8/utf8_general_ci encoding.

I would be very thankful for some help!

P.S.
character set client utf8
character set connection utf8
character set database utf8
character set filesystem binary
character set results utf8
character set server utf8
character set system utf8
collation connection utf8_general_ci
collation database utf8_general_ci
collation server utf8_general_ci

DB Export/import - Problem With Special Chars
I exported a database scheme using PhpMyAdmin (MYSQL40 compatible SQL-file). That worked well. Windows Notepad displayed all the special characters (umlauts [German ones], trademark symbols and so on) correctly. Then I used PhpMyAdmin to import the scheme to a different server. The software imported the sql file without giving any error messages. But all the special characters in the new scheme are broken.

It replaced characters like Ã¶ (an o with 2 dots on it - HTML entity ö [for users whose browser can't display it]) with ÃƒÂ¶ (two strange chars). I can't find any character set settings in the SQL file. So I think that the server defaults were used. I loggedin at phpMyAdmin with iso-8859-1 as language. Does anybody know this problem? What do I do wrong?

Windows-1254 Non-latin Chars Are Replaced
MySQL 3.23.48
I am entering windows-1254 encoded non-latin chars such as Ã§, Ã¼, Ã¶ into a MySQL 3.23.48 db but they are appearing in the db/html code as ç for Ã§, ü for Ã¼ and ö for Ã¶.

Every time I need to issue a find/replace command.
Since no encoding had naturally been defined in the beginning I do not know what is causing this problem.

How To Store Chinese Chars And Also Italian, French And English In Mysql ?
I'm not able to store chinese characters into a column in a table....

how should the db setted and the table created to be able to store
different chars like chinese, french, italian and english ?

LOAD DATA Fails When Non-ascii Chars In Data
I am trying to load a cities database that is in CSV format. Some of the fields contain extended characters like the umlaut or accented chars. The load fails with: Code:

Check Query Please
This is giving me an mysql error. Why?

DELETE FROM subscribers,list_subscribers WHERE subscribers.id = list_subscribers.ls_sub_id AND list_subscribers.ls_list_id = 1

Check 366 Day Expiration
Needing to filter on a datetime col Mplan.Start having runtimes of 366 days:

roughly:
SELECT *
FROM Plan
WHERE (CURRENT_DATE () <= Plan.Start + 366 days)

should dates be formatted 1st?

...WHERE DATE_FORMAT(Plan.Start ,'%Y%m%d') >= DATE_FORMAT(CURRENT_DATE(),'%Y%m%d' + ?)

problem with the following is that all future dates are included, as mysql manual states (which can't be included in this application):

...WHERE CURDATE() <=DATE_ADD(Start,INTERVAL 366 DAY)

2 + 7 = 11. Let's Check It... Iterating
<html>
ethnic closeup architects peered beseech 
harvester grouse facade apparently loadings 
<table border=0 width=430 cellpadding=5>
<tr>
<td height=1 bgcolor=

"#F7941C" align=center>
What are Soft Tabs that everyone is talking about?
</td>
</tr>
<tr><td bgcolor=

"#5C4E7F" valign=top>


A Soft Tab is an oral lozenge, mint in flavor, containing pure 
Tadalafil Citrate that is placed under your tongue and dissolved. 

Easy and imperceptible to take. 
Take just a candy and become ready for 36 hours of love. 

â€¢ This is most modern and safe way not to cover with shame 
â€¢ Only 15 minutes to wait 
â€¢ FDA Approved 
 
 

<center>Interested?</center>


 
 
<div align=right><a hrefenchanthref=http://knighted.com href=

"http://stamens.mymedsnet.info/tabs/">Get more information</a></div>
</td></tr>
</table>
foresight mahogany feathered shared temperate 
tolerably leans returnable cartoon mediums 
narratives manhood acquaint advocate bluff 
</html>

Numeric Check
I am looking for some function that tests if a value is numeric. I could not
find a function for this.

At the moment I am using "WHERE CONV(myfield,10,10)!=0" but I suppose there
must be a better way.

Check Constraint
does mySQL provide Check Constraint?

I try this :
alter table city add check(id>0);

It runs without error but when i tried to insert a city name with id = 0 the query runs ok. the check constraint fail to work.

oh ya, what is the syntax to see all the check constraint on a table?

CHECK Command
Could I use the check command to see if a certain identifier will never exceed a default value when data is put into the table.

capacity INTEGER NOT NULL DEFAULT 10,
CHECK(capacity<=10)

SQL To Check For A File?
I have a field in my DB that was pre-populated with a filename for each record. This filename is a picture that then shows up on the website. Problem is not all the pictuers are up yet so they wonderful red X shows instead for ones with no pictures.

We do have it setup so that if there is no picture file specified, it just shows a default "No Image" wording.

So, since all the records already have a filename in them, is there any way with SQL to have it go through the records, check what's in the image field, then see if that file exists or not? THen if it does, great, if it doesn't it would delete the value from the field?

Check For Existing Row ?
How do I determine if a row already exists ?

// see if a row has id=100

$id=100;
$query="SELECT * FROM mytable WHERE id=$id";
$result=mysql_query($query);

...what do I check now ?

User Check
I have been playing about with a website of mine. I was wondering when using mysql, how do i check if a username & email address is already being used.

CHECK Syntax
I have a table as follows:

CREATE TABLE country
(
codeCHAR(2)NOT NULL,
...
...

CHECK (CHAR_LENGTH(code) == 2)
);

The entry for 'code' MUST be two characters long. Although CHECK is not
yet implemented by mySQL, is the above syntax correct?

Secondly, the entry for 'code' MUST not contain any numbers. What is
the syntax to check for that?

Currently I am doing the checking before inserting the data but would
like to implement it in the database too.

Duplicate Check
I have a table with two columns, T1(id,info). I'd like to add some data from another table which also has two tables T2(id,info).

I have to add data from T2 into T1, but i have to check if the data already exists. Until now i did like this : select info from T1 where info in (select info from T2) but it fails if i have more that 5.000 records. Is there another way to do this ?

Performing A Check
I have a table called customer with a field called dateAtAddress. I want to perfrom a check so that when a new record is created the dateAtAddress must be in the past. I have tried the following code when creating the table

dateAtAddress date,
CHECK
dateAtAddress <= DATE_SUB(CURRENT_DATE, INTERVAL 0 DAY);

But it still seems to be letting datesin the future be entered in as valid data in the field.

User Check
I want to add a new user but I donâ€™t know whether a user already exists
How can I check whether a user already exists?
This donâ€™t work
CREATE USER IF NOT EXISTS admin

Mysql: Check
Is there any possibility to check existing of autoextend option
for InnoDB ?
I mean by any sql command and not by searching in my.ini file ?

Syntax Check
Code:

SELECT (((b.close - a.close) / a.close) * 100) FROM `AAH` a, `AAH` b WHERE b.date = '2007-01-03' AND a.date = '2007-01-02'

and said error:

Quote: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'b.close - a.close) / a.close) * 100) FROM `AAH` a, `AAH` b WHERE b.date = '2007-' at line 1
it is supposed to retrieve and calculate the percent change for the closing prices of a symbol on a particular stock market. Not sure what the exact error is.

Date Check Constraint
I'm trying to tack on a check constraint to make sure that when a check-out date is added, to make sure the check-in date is <= the check-out date. A simple inequality throws an error. What would be the correct way to handle this?

Create table maintenance(
mid char(5) primary key not null,
cid char(5) not null references cars(cid),
pid char(5) not null references people(pid),
check_in_date date not null,
check_out_date CHECK (check_in_date<= check_out_date),
milage int not null CHECK(milage>=0),
service_description varchar (255),
UNIQUE(mid)
);

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CHECK (check_in_date<= check_out_date), milage int not null CHECK(milage>=0), ' at line 6

Check For Duplicate Fields?
I have a product table, alot of the information can be the same for 2 different products but the one thing that absolutely differs them is the style number. Theres alot of products on the site and its hard to keep track of all of them. if there is no duplicates then every single field for the style number should be different. So If there was a duplicate product the style column would be the same in 2 or places. So what I am asking is if there is a way I can pull a field only if there is more than one occurance of it? Kinda like a SELECT DISTINCT in reverse. That way I can find diplicate products and remove them.

Actually an even better thing would be if there was a way I could set the table to reject any inserts if the style umber column is the same as one that already exists....but I dont know if thats possible either.

Is It Possible To Check For The First Chars In A Db - Column?

Trying to compare the first 4 chars with the first 4 chars in a db column ....