MYSQL :: Duplicate Records Check

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 ?

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.

Check For Duplicate Databases
I have a program that I am writing in PHP/MySQL. I have made some upgrades
to the database and like an idiot, forgot to write down the changes or to
make the changes in several other databases for the other clients that are
using the program also. What I am trying to do is to have a program,
(preferably in PHP) that will look at the structure of the main database
that I changed, then it will check the other databases to make sure that
the structure is identical and if not, it will change them to make them
identical. Is there a program already out there that would do this?

Check For Duplicate Data
I am having a problem sorting duplicate data within a table. I have a table called Employee that contains EmployeeID, EmployeeName, PhoneNumber. This table contains duplicate data. I now have a problem with 2 different users with the same EmployeeID 'abc'.

I wondered if there is a way to write a select statment to delete one of the users with same id. I have tried doing a few things with DISTINCT but I could not get the EmployeeID and 2 EmployeeNames to filter out.

Strange Results When Trying To Do A Duplicate Entry Check
My goal with this is to check a database for duplicates using the first 25 characters of the "title" column in a database called "jos_content." The query should find the entries whose titles appear more than once and then the second part should take those entries and mark them for trash (state=-2 is trash).

CREATE TEMPORARY TABLE dupes
SELECT Left(title,25)
FROM jos_content
GROUP BY title
HAVING COUNT(*)>1; # Affected rows: 4

UPDATE jos_content
SET state="-2"
WHERE (title) IN (SELECT Left(title,25) FROM dupes); # MySQL returned an empty result set (i.e. zero rows).

The result for the first part finds entries but I suspect they aren't duplicates becuase the second part returns zero entries. The actual database has about 16 duplicate rows based on the first 25 characters of the title column.

How Do I Check For Missing Records?
I have nearly 10,000 records in my database so it would be impossible to check to see if all of the records are in the database if I checked by hand. I have an integer field in my db called Lnum which I created using excel. The purpose of the Lnum field was to give me a reference and numbering field in the spreadsheet work.

I carried the Lnum field over into the db. The Lnum field has integers numbered for the most part sequentially. A few numbers are repeated. What I want to check for is whether there are any missing records in the database by checking to make sure there are no numerical gaps between Lnum = 1 and Lnum = 99,500.

If there is a numerical gap in the Lnum sequencing, this means I have a missing record or records. Is there a way to use the Lnum field to find missing records, possibly by adding an incrementally numbered field?

Duplicate Records
I've noticed what might be a bug. I'm using InnoDB tables to store some payment information. Included in the table is a DATETIME field that logs the exact time a payment was made to a client. The problem is that in one instance there are clearly duplicates of a payment record in the table. i.e. 3 records were inserted that have the exact same information including the same timestamp. I have checked the code making the INSERTs and it can't be that. It's just a simple INSERT query. Has anyone else noticed things like this and is there a solution?

Duplicate Records
mysql> select id, student_first_name, student_last_name, email,
application_date, modification_date, unique_key from student where id
in (7268, 862);
+------+--------------------+-------------------+----------------------------+---------------------+---------------------+------------------+
| id | student_first_name | student_last_name | email
| application_date | modification_date | unique_key |
+------+--------------------+-------------------+----------------------------+---------------------+---------------------+------------------+
| 862 | Phil | Powell | phil@blah.com |
2006-02-27 00:00:00 | 2006-02-27 00:00:00 | dF0WByrCP0vACftA |
| 7268 | Phil | Powell | phil@blah.com |
2006-02-27 00:00:00 | 2006-02-27 00:00:00 | dF0WByrCP0vACftA |
+------+--------------------+-------------------+----------------------------+---------------------+---------------------+------------------+

I accidentally created duplicate records upon attempting to migrate
data from one server to another. You will have 2, 3 or more records
with every single field identical except for the ID. Best way to know
they're dups is by "application_date" along with "unique_key".

Stop Duplicate Records
How do i stop duplicate records from being inserted into the database. i need to stop duplicates of title and link from being entered .....

Eliminate ALL Duplicate Records
I am trying to compare 1 field table 1.Mat_Num and compare it to table 2.Mat_Num
and eliminate all overlap so that only fields in table 1.Mat_Num that are not in table 2.Mat_Num are remaining. Or something like the following query:

Select table1.Mat_Num
From table1.Mat_Num, table2.Mat_Num
Where table1.Mat_Num <> table2.Mat_Num

I have used LIKE, NOT LIKE, IN, NOT IN, JOIN, and everthing else found on google just short of scripting. Obvously, my current results have been a loop listing every instance where table1.Mat_Num(Field X) NOT table2.Mat_Num(Field X). so it is not taking table1.Mat_Num(Field 1) and then searching all fields in table2.Mat_Num for an occurance.

How To Avoid Duplicate Records
I need to filter out duplicates for every 30 seconds. say i have two duplicate records within the 30 seconds limit. I need to show up only one. If there are identical records but with a different time settings(say above 30 seconds) then i need to display it. I need to restrict duplicate records within 30 seconds.

Picking Out Duplicate Records
I have a student results table with the layout shown below (four records with the fields separated by dashes). Sorry its so messy. Anyway, you can see that there are duplicates. I want to write an SQL statement that will pick out only the 'supplemental' records if duplicates occur. Any ideas on how to do this?

ID - StudentNo - Subject - Term - Yearofstudy - YearTaken - Grade
1195 - 11111111 - MA1E2 - Annual - 1 - 2006 - 34
1205 - 11111111 - MA1E2 - Supplemental - 1 - 2006 - 40 (S)
1194 - 11111111 - MA1E1 - Annual -1 - 2006 - 35
1204 - 11111111 - MA1E1 - Supplemental - 1 - 2006 - 40 (S)

Here is the SQL I'm using to get all the records from the studentresults table, for first years only:

SELECT *
FROM studentresults
WHERE studentresults.StudentNo = 11111111 AND studentresults.YearOfStudy = 1

How do I change this to pick out only the supplemental exam results?

Finding Duplicate Records
I'm trying to setup a way to find possible duplicate or near-duplicate
records of contact people. I have a table of 50k records doing an
inner join with itself, something like this:

SELECT p1.fields, p2.fields
FROM table AS p1 INNER JOIN table AS p2 ON p1.lastname = p2.lastname
WHERE p1.id <p2.id AND
(other criteria)

The id and name and other criteria fields are indexed as well as they
can be. It works fine as long as I add a LIMIT statement to keep it
down to just 10 or 20 records, but if I take this off, it runs on
forever -- so I can't even tell how many potentail records there will
be. If the table grows to 100k or 200k, it'll only get worse.

So my question is -- are there any better ways to go about this?

Delete Duplicate Records
I have a sql script that finds the duplicates in a file. Now how do I go about getting rid of the duplicate entries without doing it manually?

Deleting Duplicate Records
how to delete duplicate records from my DB, where I have about 65502 records. I have a auto-incremend "id" field, then I have a file_letter field (which holds info like A, B, C - Z), and then I have a file_no field. Basically, the file_letter and file_no fields make a unique pair, thus there can be more than one "file_no = '23' (for ex. file_letter = A, file_no = 32 / file_letter=B, file_no = 32, etc etc)

How do I delete duplicate records using these two fields as a unique pair? I'm running MySQL 5.0.15-max-log.

Need To Delete Duplicate Records.
I used LOAD DATA FILE to load data into a mysql database. I discovered that
there are lots of duplicate records. Can anyone give me a simple list of
mysql commands to search and destroy duplicate records?

Way To Duplicate Table And Its Records?
Is there a way in mySQL to duplicate a table? I want to copy a table's structure and all of its records, for testing purposes.

Stop Duplicate Records
Sorry if this is extremely newbie of me but how do i stop duplicate records? I have created a small site with php and mysql which allows a user to reserve a parking space online.

Im only learning mysql and php so its all done very simply - I have a table with 2 fields - space and daybooked. users can go online and book for example Space number 2 for Wednesday. How would i carry out a check that would stop another user from double booking the same space?

Removing Duplicate Records
I received a table from a third party that should be primary keyed on a column called item_id. But that column has four rows that are duplicated, including item_id. I would like to remove one of each of the duplicate rows, leaving the other row intact.
MYSQLBrowser won't let me create a primary key until this is solved.

Non Duplicate Records Querry
I have a table with 701 duplicate records. The number of non duplicate records from this table is 179 I tryed to make a querry like :

Select Distinct count(recordname) from table

but the result is the same 701

What is the proper querry to get the 179 result ?

Remove Duplicate Records
What is the best way to remove duplicate records

Delete Duplicate Records.
I used LOAD DATA FILE to load data into a mysql database. I discovered that
there are lots of duplicate records. Can anyone give me a simple list of
mysql commands to search and destroy duplicate records

Stopping Duplicate Records
I've got a table which has three colums. The first is the row id, the other two are basically parent and child.
I need to ensure that there aren't any duplicate parent/child inserts, but without an extra hit to the DB to check first.

Returning Results Without Duplicate Records
I have 2 tables with related data.
one table is for products. and the other orders. In orders table one product may appear several times.
Now if i wanted to return an array with the products being ordered I will get duplicates of each product.
How can I return the results showing the products ordered wirhout containg duplicate rows

Avoid Duplicate Records In Within 30 Seconds
I'm working with php. I have a auction site, more or less. I want to create all-time rankings. The idea is to display where a seller ranks (all time) in the number of sales.

So for example, I'd display
John Doe All Time Sales Ranking: #138

I'm not exactly sure how to go about this.

$query = "SELECT count(*) as counter, SellerName FROM sales GROUP BY Sellername ORDER BY counter DESC";

This query would give me the data to list all of the Sellers in desc order by the number of sales.

In php, I could probably count until the Sellername was equal to $Sellername (already defined in their profile page), but I was hoping there would be a way to do this entirely in MySQL.

Duplicate Records Delete Query
I have a table with duplicate records but the key of the duplicate records is different, that is:

The key of one of the record has the format:

Rssss

The key of the second record has the format:

ssss

How can I delete both records from the table?

DISTINCT Still Showing Duplicate Records
Why won't distinct work? The sql IS selecting correctly but its showling records with the same f.preplyid

CODE

SELECT DISTINCT (f.preplyid), f.pid, f.ptid, f.ptid2, f.puid, f.psubject, f.ptype, f.ptime, t1.tid, t1.tname tname1, t2.tid, t2.tname tname2 FROM forumpost as f, thread as t1, thread as t2 WHERE t1.tid = f.ptid AND t2.tid = f.ptid2 AND f.puid =2 AND f.ptype=1 AND f.puid NOT IN (SELECT fp.puid FROM forumpost as fp WHERE fp.ptype=0 AND fp.pid=f.preplyid) ORDER by f.ptime desc LIMIT 7

Selecting Non Duplicate Records Without Using DISTINCT
how not to display duplicate records without using DISTINCT. Say i have a database:

ID Channel Description
41 Africa News Latest news from africa
42 Technology News Latest Tech News
43 PC News Latest PC related news
44 Africa News Latest news from africa

I run the query 'SELECT DISTINCT * FROM Mytbl' and obviously get the results as shown above with 'Africa News' appearing twice as the primary key ID makes it unique.

How can i return only one of the Africa entries in the results while still having the primary key value returned as well?

Unfortunately with this particular app it is inevitable that duplicate values will occasionally be added to the database but i never want duplicates to be returned from a search query. Can this be done?

Update A Record Out Of 2 Duplicate Records Which Dont Have Primary Key In Mysql Table
how to update a record out of 2 duplicate records which dont have primary key in mysql table?

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)

Count Related Records, But Show Records With NO Related Records Also
cl_items
========
it_id (pk)
it_ownerid
it_name

cl_offers
========
off_id (pk)
off_itid (fk) -> to it_id
off_whoid

My query needs to output ALL of the records in cl_items AND still show how many offers are on each item (from cl_offers)

I can't get what I want through the GROUP BY because I want to show the records in cl_items which DO NOT have any offers on them yet also.

Is there any way to do this with mysql only?

All Records From Table A - All Records From Table B - Join Alike Records
I am by no means a SQl Jedi as will be apparent by my question, but I
can usually figure out a select statement on my own. I have one today
though that really has me stumped. I am working in MySQlL 5.

In My first select statement I get all my records from Table B
SELECT
`table_A`.`ITEM`,
`table_A`.`DECSCRIPTION`,
`table_A`.`UM`,
`table_A`.`PHASE`,
`table_B`.`Qty`,
`table_B`.`Calc` as calculated
FROM
`table_A`
Inner Join `table_B` ON `req_itemlist`.`ITEM` = `table_B`.`ItemID`

In my second statement I get my records that match in this case phase
401 in Table B and all my Table A records for phase 401.

SELECT
`table_A`.`ITEM`,
`table_A`.`DECSCRIPTION`,
`table_A`.`UM`,
`table_A`.`PHASE`,
`table_B`.`Qty`,
`table_B`.`Calc` as calculated
FROM
`table_A`

Left Outer Join `table_B` ON `req_itemlist`.`ITEM` = `table_B`.`ItemID`
Where
table_A.PHASE In ('401' )

Now I need to combine the Data of both recordsets. I need EVERYTHING in
Table B, but I also need All Table A records that match the phase
selection....

Can I write this one query or do I need to use a Temp table?

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
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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.

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 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.

How Check How Long Did My Select Took ?
I have a client for mysql which give me the time it took to query but now is very doubtful. I have 2 machines on the same network accessing the same database one is showing 360ms and the other is showing 5469ms on the same select? Thus I am very confuse where can I verify which is the exact time ? Thanks.

Duplicate Records Check

Could any one advise what SQL statement I would need to use, to check a table for any duplicate records e.g that contain the same data within a field. Note that I haven't got the field as a unqiue field.

Could any one advise what SQL statement I would need to use, to check a
table for any duplicate records e.g that contain the same data within a
field. Note that I haven't got the field as a unqiue field.