MYSQL :: How Do I Add Default To Existing Column?

Add Auto Increment To Existing Column
I have a table with 126 rows in it. The guy that originally created the table didn't think to make the id column an auto incremented one.

For the PHP script I am writing I could really do with making the id column auto increment.

I've tried

CODEALTER TABLE products CHANGE product_id product_id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT

With INSERT Can I Increment An Existing Value In A Column?
I have a table of addresses and a seperate table with contact names -
All addresses tie to one or more names - I would like to keep track of
the number of names 'belonging' to an address and have thus included a
column in my address table called num_of_contacts. Everytime I add a
new contact, I would like to increment the num_of_contacts column in the
address table. Is this possible?

Me thinks not (or at least, my attempts so far have failed me) so I'd
appreciate it if someone could tell me if I am wasteing my time trying
and instead SELECT the record, increment it, then UPDATE it.

Search Table Column For Existing Value
I would like to search a table's column so that I can match an entered email address against the data in that column. I'm writing an aplication for an event and I don't want duplicate email addresses in the table. I'm using PHP4.

Existing Column Auto Increment
Can you make an existing column in a table auto increment? The column in question has unique consequtive values.

How Do You Discern The Type Of An Existing Mysql Table Column?
I have a program that needs to be able to know whether a MySQL column is a number type or other. Is there a function that does this, or can anyone else suggest a way of discerning this reliably using SQL statements?

Default Value For A Column, When Value Is Not Specified
We have migrated our database from DB2 to MYSQL. In DB2, there is an option like 'GENERATED BY DEFAULT AS IDENTITY' which will cause DB2 to generate unique values for the identity column during insert operations if no value is specified for the identity column. However, if a value is specified for the identity column, DB2 will use it in the insert operation.

In MYSQL, is there an option like this?

Default Value On A Column
Hey guys, my hope is to quickly move from SQL2005 to mySQL and i'm hitting the GUID roadblock. If mySQL can't do a GUID by default on a column, I've got to rewrite a ton of my application around that. Tell me with 5.0 this is possible now? Or that there's some cool work-around?

Column Default Value
How may I change the default value of
an existing table?
(type will remain the same)

Column Default Value Setting
I've got a column called 'articleheader' in a table called 'article'. It currently has a default value of NULL, but i want to set it to default to "(none)" (without the double quotes). I have tried searching to find a solution but everytime I try the posted "solutions" I get an error.

I think it is because I don't specifiy the type of column it is or something.

Default Value On Date Column
Using MySQL control center, I created a MySQL database table with a
column of Date type. It always give the a Default value (0000-00-00)
even null is allowed. I tried remove the default value and it comes
back by itself.

So if I don't supply a value when insert, the default is used. Query
IS NOT NULL will not exclude this record.

Now, In VB (with ADO/MyOLEDB), I did the exact query trying to filter
out the null record. But I still get the record just like in Control
Center. BUT, the value on this column is "NULL".

How can I leave the Date field as null if no value is supplied?

How To Set The Default For A Datetime Column To Curdate()
I'd like to set the default value for a datetime type column in a table to today's date. It seems I should be able to do this with the CURDATE() function.

I tried adding a call to the function in the default value field when creating the table's column, by when I save the table the default reverts to "0000-00-00 00:00:00"

I've done this in other RDMSs. How can I do it in MySQL?

How To Give 4 Default Values To A Column
I need to create a table in which a column is to be specified with 4 default values. Is it possible?

#1101 - BLOB/TEXT Column 'data' Can't Have A Default Value
Im using phpmyadmin for working with mySQL. (its my local version, im just trying to use it).

When i want to add BLOB type column in table - that mistake appears:
#1101 - BLOB/TEXT column 'data' can't have a default value

I turned off strict mode (from my.ini, or by config wizard), but it did not help.

I've found alot about that problem in that site, but i dont uderstand anything, because im just Newbie.

So what should i do to make BLOB/TEXT column have a default value? Is it possible without using hard way, just by changing something, or download any new version?

Date/Time As A Default Values For A Table Column
I am new to mySQL, so this question might be simple.I want to add a default value to a column that is the current date/time. I am using the mySQL Administrator and will not allow me to use a function like CURRENT_TIMESTAMP() or NOW() as a default value. I used to do this with other databases (I always add a column to all of my tables called InsertDateTime and UpdateDateTime. It helps to track down data entry problems)

Defining Current Date As Default For Table Column
I would appreciate any help with a very simple question.

What can I put in as the default value when creating a table with a date column so that the current date will automatically populate the field.

Error #1293: There Can Be Only One TIMESTAMP Column With CURRENT_TIMESTAMP In DEFAULT Or ON UPDATE Clause
I am using MySQL 4.0/4.1 version. And I am trying to add two timestamp columns to a single table. The columns are insert_date and updat_date to capture the date/time the record was initially inserted as well as the date/time the record was last updated respectively.

When I try to set one column (insert_date) with a default value of CURRENT_TIMESTAMP and the other column (updat_date) with ON UPDATE CURRENT_TIMESTAMP, I end up getting the following error:

#1293 - Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause

Is there any way around this problem?

Table Joins On Existing/Non-Existing Data
I have a question that involves a joining tables on potentially non-existing data, but we will know the expected values whether they exist or not.

Say we're keeping statistics on any given number of sports for attendances over weekly time periods. There's two tables to hold data.

------------------------------
TABLE: StatisticTypes
id
name
------------------------------
TABLE: Statistics
id
statisticTypeId
value
date
------------------------------

Then, say, we have three entries in the StatisticTypes table for types of sports we're keeping data on...

Copying Column Names And Properties From An Existing Table To A New Table?
I've got a table with 42 columns, set to different types (string, datetime, date, integer). It has 8 million rows. I want to make a new table with the exact same columns, but with no data in it. Is there an easy way to do this without re-defining every column?

Column Is Blank, Default Is Not Applied (was "huh?")
Attached are 2 screenshots of my PHPMyAdmin, what I dont understand is why the phone column is blank when I declared it to have a default of ~hidden~?

My.cnf Not Existing
this is my first posting here so plz do not flame me too much if my quest=
ion=20
marks me as a total noob.

My problem is, i play around a bit with mysql (4.0.13) and want to test t=
he=20
Replication. The Documentation at http://www.mysql.com says i have to do =
the=20
following:
Stop databases - done.
Build tarball of data and bring it on slave - done.
Modify my.cnf - ???

Here is my problem. There is no my.cnf existing on my machine. Maybe its=20
called different with the newer version? Or can it be considered empty an=
d i=20
have to build a new one? But if i have to, in which directory would i do=20
that?

ON EXISTING Clause
What I'm trying to do is update a table of mine in mySQL. However, some of the values may not exist in the table yet, while most will already be there.

I have done some searching and I think I need help. I'm assuming UPDATE won't simply act as an INSERT if the existing value is not found. From my searching it seems I need to use the ON EXISTING clause with an INSERT. However, it seems that ON EXISTING can only be used when there is a primary key. In my case, thats not the case here.

However, for me this is query confusing at the moment. Can someone provide a hand?

My table is called "rankings" and has the following structure:
comp_id - int (and an index)
uid - int
networth - int

How To Add A New Row To An Existing Table?
I am able to create database, tables, inserting values, and so forth. My question is this:

Let's say I have a table on the list of items I owned, and some time later, I need to add a new item between after row 12 and before 13. How do I do that? I did look at MySQL 5.0 Manual and didn't find anything similar to what I wanted to do.

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 ?

Using Existing Database
I am setting up a new dev. machine and need to get an old database into the new installation of MySql. There are two databases showing on the database list 'mysql' and 'test'.
Can I drop the old database (contained in a folder) straight in with the existing databases and get any sense from it?

Existing Database
I'm using MySQL 4.1.9-nt & VC++ 6.0 .
how to get all the database names and table names?

I'm using the VC++ syntax,

CRecordset rs(&db); //here db is object of CDatabase class.
rs.Open(AFX_DB_USE_DEFAULT_TYPE,"show databases ");

Information From Existing Db
Dont know much about mySQL, so excuse my potential ignorance here :
Is it possible for a table to write information to another table automatically?
For example, if on "table1" I have a column called "code", can I write the entire contents of a specified row to another table called "abc" if the code "abc" appears in the "code" column of "table1"

Add A Record To An Existing Recordset?
I have a MySQL table with about 30 records, I use a form to insert data into the first 24. (like; Name, Phone, etc...)

The last 6 (Photo1, Photo2, Photo3, Photo4, Photo5, Photo6) are the names of uploaded images (which are uploaded from a seperate form.

How do I (Or what MySQL statement do I use) to insert the 6 names into the recordset?
(Each image name will be saved into a php variable. ($Img1, $Img2, $Img3, $Img4, $Img5, $Img6)

Using Update To Add Value To Existing Numeric Value
I have users inputting hours into a mysql database. Is there a way to have a mysql statement take my input and add it to the existing value in a record? I suppose I could just select that value and use php to add the 2 values but was thinking mysql might have a function to do this for me.

Moving Existing Fields Out
Can someone tell me what would be the best way to move fields out of an existing table into new tables?

Best Way To Get Data From Existing Database
what I'm trying to do is get data from an exhisting oracle database that is not looked after by myself but I have access to. What I want is for my MySql database to mirror the oracle one or update every 5mins or so. I have done a quick search but as I have only made simple databases before I'm not sure what to search for!

Attaching An Existing Database
I would like to attach an existing database (I have the files from another system) to MySQL running on a recovery machine - yeah, the Linux system got screwed, but I managed to recover the files.

So, having the database files (.myi, .myd and .frm), how do I go about incorporating them into the current system? (Like "attach database" in MSSQL)

Foreign Key To Existing Table?
Is it possible to add a foreign key to a table that already exists? Or do I have to drop the table and recreate it?

Insert Row Into Existing Table
I have a table with rougly 70 threads, I now need to go back and insert a couple new entries into my table, but they cant go at the end, they need to go in the middle, say like ID 40,41,and 42. How do I do this?

Insert A Duplicate Of An Existing Row
I have a table with an auto-increment columns (absid) and I want to take a row with a certain absid and re-insert it as a new row with a new absid (but all other columns as from the copied row). Running mysql 3.23.55. Might something like the following work?

insert into mytable (absid,*) values 0 select * from mytable where absid=20;

or something similar? With 3.23.55 I suspect it won't work anyway but I have no access to a version 4 installation and wouldn't want to upgrade if what I want to do is inherently not possible.

Accessing Existing DB From Files Off A CD
I inherited a project from another developer who was fired. There is no database documentation. There is both an SQL backup file and the original database files on a CD. I have recreated the db from the backup file and that worked perfectly. However, I don't have full confidence in the accuracy of the backup file. I was wondering if I can somehow access the db from the files on the CD.

I copied the files to a folder on my machine and then changed the MySQL data folder setting to that folder. Unfortunately MySQL wouldn't start. What would I need to do to be able to have MySQL use the files copied from the CD as the data files?

Running An Existing SQL File
I hope this question is not too 'newbie' to answer.. I'm reading a book (PHP and MySQL web development by Luke Welling and Laura Thomson), and am getting an error on an example script.

I'm trying to create tables using an existing SQL file through MySQL. According to the book, it should be done like this:

> mysql -h hostname -u username -D database -p < file.sql
(I've changed the hostname, username, etc.)

However, I get the same error over and over again: ERROR 1064 (42000): ... at line 1. The book didn't even mention where to put the file, I've tried all sorts of things, but can't get it to work..

Copy Of An Existing Table
MySQL: How I make a copy of an existing table in phpMyAdmin or SQL ?

without copy data
with copy and data

Uploading Existing Database
I just got a dedicated server and can't upload some of the larger databases. I have tried compressed (gz) as well as the none zipped and automatic. None works for a 50MB + database.

I am not sure what's wrong, maybe it times out, but then I never get the error. If that's the case then how do I change the timeout settings in MySQL. Also I am using Plesk, not sure if that matters.

Edit Existing Data
I have just started to learn MySQL and this question might be silly. I have a MySQL table with user information. I want to edit this table in a website. I need to load existing data in a HTML form and then edit the fields and update them.
I searched the net but could not find anything .

List Of Non-existing Users
I have 2 tables: tableFrom , tableTo.

I want to have the list of users that ARE in tableFrom, but NOT in tableTo.
The common field is "username".
I want all the rows from tableFrom as long as they don't already exist in tableTo.
An important point is that we use MySQL 4.0.20, so I can't use "NOT EXISTS(...)".
This query needs to be pretty fast since it might be ran many times an hour, even minutes.

Check Existing Values
In my web site I'm using PHP, & MySQL.
There its needed if a user is trying to be registerd using a existing user ID.
That is I think, it should check such a value existing and if exists it must display "Existing User ID".

Convert Existing Data
i am working on a project and i need to convert already existing data into the mysql date format. I was told for the project that the date format was necessary. my first question is what is the advantage of having the mysql date formate which goes like this yyyy-mm-dd. the format my data currently is in is like this mm/dd/yyyy. The second question is how to convert from mm/dd/yyyy to yyyy-mm-dd

Assigning Userids To Existing Table
I have a table of existing users in a database. I want to add a "userid" column to the database that automatically assigns an ID to each user when new accounts are added to the system. I know I would do something like this if I had the brains to have added the column at the time of creating the table:

ALTER TABLE writers ADD (
userid int PRIMARY KEY auto_increment
);

However, the table is now already active with users, and I want userids assigned to existing accounts on the system.

Change Existing Search Code
On my site I have this code which works fine when searching for single words or where they are adjacent words, but gives no results if 2 words are entered and are not adjacent

if ($_GET["page"]=='search')
{
$sql="SELECT C.category_description,C.category_name,A.article_title,A.article_author,A.article_snippet,A.article_category_id,A.article_id,A.article_views FROM article_master A,category_master C where A.article_category_id=C.category_id and C.category_status=1 and A.article_status=1 and (A.article_title like '%".$_GET["q"]."%' OR A.article_snippet like '%".$_GET["q"]."%' OR A.article_summary like '%".$_GET["q"]."%'OR A.article_author Like'%".$_GET["q"]."')order by A.article_title asc";
$cmdartcat = mysql_query($sql);
$metatitle="Search Results For ".$_GET["q"];

someone kindly suggested this, I have been trying to adapt the original all night but have got no where (i am not really sure what does what)

$query = "SELECT {$columns} WHERE {$ADJACENT_ONLY}";
/* Load this data into an array */
$query = "SELECT {$columns} WHERE {$ALL_WORDS_ANYWHERE}";
/* Append this data to the previously loaded */
$query = "SELECT {$columns} WHERE {$ANY_OF_THE_WORDS}";
/* Append this data to the previously loaded */

Could someone change the original code to work for ANY_OF_THE_WORDS and then hopefully I may be able to then adapt the rest. (do I have to do anything to the search box results which in this case is "q")

Import Data Via Ssh Into An Existing Table
I want to import data from several .sql files into an existing database, into one table.

I tried using the following command:
mysql -e [sqlfile] [db_name]

But the problem was when I imported the next file, it would overwrite the previous imported data.

Could anyone let me know how to do this correctly, please?

Moving An Existing MySQL Database From
I have an existing database already created on 4.0.25-standard. It is too large to import to my new server via phpmyadmin, so I'm using mysqldump. The new server has MySQL 4.1.12 instead of 4.0.25. I am running this command:

mysqldump -u root -p starfall < smf1 --create-options --compatible=mysql40

but I get this: Code:

MySQL -- Editing Existing Data In A Row
I looked through ALTER table, and some tuts over at w3schools (my heros) but I can't seem to find a way to edit EXISTING data in an EXISTING row of a table.

Add Multiple Rows To An Existing Table?
I have a table named manufacturers, it has one row in right now. I want to upload all of my manufacturers into the table. Is there a way to add multiple rows to the table at the same time? If not, what is a quick way to get about 1,000 manufacturers uploaded into a table?

How Do I Add Default To Existing Column?

It should be easy but i've searched from mysql manual to here...