MYSQL :: Table: Max Number Of Rows

Number Of Table Rows
I have tried to answer this question by using Google but my search didn't bear any fruits, so to speak.

I am in the middle of designing my db and i have just thought that in some of my tables i think i will have 1000s of entries [rows] and if my web application with a db backend is successful it can turn into millions of rows [wishful] - so i wanted to know is there a limit in the number of rows for a table? I think not, but how will performance be effected?I am using a MySQL database, I am using a linux server not sure if this matters but microsft and i dont get along.

Limiting Number Of Rows In A Table
I'm trying to implement a basic log in a table. Instead of writing to a text
file on the server, I want to insert entries into a 'log' table. However, I
want to limit this table to only have the last 500 rows or so. How do I do
this?

Here's my pseudocode, but it seems as if there would be a better way:

logEntry($message){
insert message into table
get number of rows in table
if (numrows > 500){
delete from table where ((numrows - id) > 500)
}
}

Is that right?

What Is The Max Number Of Rows A MYSQL Table Can Contain
What is the max number of rows a MYSQL table can contain.

Getting Number Of Rows From Left Join Table
PHP

SELECT bulletin.id AS bid, bulletin.bulletinname AS bname, bulletin.bulletindesc AS bdesc, bulletin_post.id AS postid, DATE_FORMAT(bulletin_post.postingtime,'%M %d, %Y %l:%i%p') AS postdate, bulletin_post.bulletintitle AS ptitle, member.screenname AS mname, member.id AS posterid FROM bulletin LEFT OUTER JOIN bulletin_post ON bulletin.id = bulletin_post.bulletinid AND bulletin_post.postingtime = (SELECT MAX(postingtime) FROM bulletin_post WHERE bulletinid = bid) LEFT JOIN member ON member.id = bulletin_post.memberid WHERE bulletin.active = 1 ORDER BY bulletin.bulletinname ASC

My question is how would I get the count of rows if any from the bulletin_post table?

Get Number Of Rows Above A Row
I have one table with a some user info, and a column with the users points. I would like to fetch the user data and sonehow calculate in which place that user is. Basically, the number of users that has more points than the user.

An exampel of the table and data:

+----+---------+--------+
| id | name | points |
+----+---------+--------+
| 1 | chris | 1000 |
| 2 | john | 900 |
| 3 | jeff | 800 |
| 4 | jay | 700 |
| 5 | michael | 600 |
| 6 | eric | 500 |
| 7 | stuart | 400 |
+----+---------+--------+

And an example of the data set I would like:

+----+---------+--------+----------+
| id | name | points | position |
+----+---------+--------+----------+
| 1 | chris | 1000 | 1 |
| 3 | jeff | 800 | 3 |
| 6 | eric | 500 | 6 |
+----+---------+--------+----------+

I'm not sure how to do this in one query, and I'm not even sure that it's possible, but if it is I sure would like to know how.

I'm using MySQL 4.1.16.

Getting The Number Of Rows.
How could I get mysql to just print the number of rows for this query, because this is currently return hundreds of rows. I just want one row.

I want to know how many duplicate first names there is.

CODESELECT COUNT(*) as total FROM members WHERE first!='' GROUP BY first HAVING total>1

Number Of Rows
i have got a script that log all downloads (daily) in a database.
I would like to know how to query that database, to get the number of records per month.
my records look like this
date ip
2006-01-01 200.1.157.11
2006-01-01 192.168.10.3
2006-02-05 198.10.10.2
etc

needed output
01 2
02 1

Get Number Of Rows
I'm developing a hr system which will display Staff that are currently in the financial year(regardless of resigned or not resigned). Our financial year is from Oct - Sep (Oct 2006 - Sep 2007) For staff that have not resigned (@ the pt of query), the dateTerminated field is NULL.

I have a database that stores resignation date and startdate (both columns are date type). I tried with the following query but was not successful. PLease help.

Select * from (select name,dateTerminated,dept from user_info,hr_users where user_info.id=hr_users.sn
or dateTerminated is null
AND (year(dateTerminated)<=2007
AND year(dateTerminated)>=8)
)as table2 dunno how to continue ???
order by table2.name ASC

Number Of Rows
Is there a quick query (without just asking to query the entire database) that will return the number of rows in a given table?
I know I can do SELECT * FROM table but I don't really care about the data, I just want to know how many entries there are.

PHP - Can't Add Rows Past A Certain Id Number (127)
I've got a table which has about 70 rows in. The rows' ids start at 1, have a large gap in the middle, then range up to 127. If I try to add a new row with an autoindexed new id, I get the following MySQL error: duplicate entry '127' for key 1.

If I add a new row with a lower id, e.g. 6, there are no issues - it works fine. If I delete row 127, or give it a lower number, I can then add a new row as normal, but then the error happens again for all subsequent rows.

Everything was working fine with the page that adds new rows until it got to 127. Is this some kind of magic number I don't know about?

Calculate Number Of Rows
From the packet data returned from a query, where in the packet data are the
bytes signifying the number of rows returned?

Restricting The Number Of Rows
I wold like to restrict the number of rows in my table. Currently I am using the mySQL ver 4.1.12a-nt

I have alter the table using this statement,

ALTER TABLE `database1`.`tabley` MAX_ROWS = 7;

But whenever I insert the 8th row, it executed successfully.

Pls explain why and how should I go about restricting the number of rows?

Maximum Number Of Rows
I am looking for information on the total number rows that can be used in an InnoDB,if there is even such a limit.I am not a DBA, so the information on mysql is a bit cryptic.

Retrieve Number Of Rows
I've got a large table with a lot of entries. only two fields, one's the key (which auto incs) and the other's a text field...if I want to just retrieve the number of rows in the table, what's the best way to do this?I know I could tell mysql to sort the table by the key row and then take the first one, but wouldn't this make it analyze the entire table (which would waste resources, especially considering that this table will have thousands and thousands of entries)? what's a better way to do it?

Actual Number Of Rows
I have a query in PHP with a LIMIT statement. Is there an easy way to get the actual number of rows (like a have no LIMIT in it)?

Limit Number Of Rows
I was wondering how can I limit the number of rows used in a table.
For example if we wanna create a table named table1 having only 7 rows.

JDBC Number Rows
After you have done a .executeQuery() and returned that to a ResultSet how do you get the number of rows returned?
I have tried using getFetchSize() but that does not help me.

Counting Number Of Rows
Can anyone come up with a novel way of counting the number of rows in a table that contain no NULL values in the columns that each row contains?
Each row contains 200+ columns, so doing a "count" on each column, and then selecting the smallest value is not very practical.

Retrive A Limit Number Of Rows
How can I make the following query :
I would like to retreive only the number of rows while sum(field1) < 20. Is this possible?
If my table have the following values :

1
4
6
8
5

It only retrieves the first 4 rows. sum(field1)=19

Total Number Of Rows Affected
in Mysql Control Center, how can I modify the Total Number of Rows Affected in a query??
in fact I want to disply all the records of the table but I get only 1000 rows, is it possible to do that and how?

Count Number Of Rows Returned?
this is my connect and everything code:

<?php // connect to the mysql database server.
mysql_connect ($dbhost, $dbusername, $dbuserpass);
mysql_select_db($dbname) or die(mysql_error());
$query = "SELECT DISTINCT category FROM $tuttable";
$result = mysql_query($query) or die(mysql_error());
while ($row = mysql_fetch_array($result))
{
echo ($row['category']." | ");
}
echo count($row);
?>

Notice "echo count($row);" How do i get this to work properly. It only returns one, because there is only 1 that it is working on. I want to return the count of all the rows that fit that query.

Counting Number Of Rows Returned
I want to count the number of rows returned when I execute an SQL query. At the moment I am selecting them all and cycling through them:

$count=0;
$query = "SELECT * FROM swe_picgal WHERE cat="".$cat.""";
if ($mysql_result = mysql_query($query, $linkdb)) {
if (ExecuteQuery($linkdb, $result, $query)) {
while ($row = NextRow($result)) {
$count++;
}}}
print('Number of rows: '.$count.'');

Surely there is an easier way? I assumer mySQL will have a built in counting function?

Retrive Rows Affected Number
I'm trying to migrate some MS Sql Stored Procedures in MySql. Here is the MSSQL stored procedure.

CREATE PROCEDURE CB_UserLogin
(
    @User      nvarchar(50),
    @Pass   nvarchar(50),
    @ID_Util int OUTPUT
)
AS

SELECT
    @ID_Util = fID_Util

FROM
    tblUtiliz

WHERE
    fUtilizator = @User
  AND
    fParola = @Pass

IF @@Rowcount < 1
SELECT
    @ID_Util = 0

Unions -- Number Of Rows Returned
I have this query:

SELECTcount(*)
FROMpa_album
WHEREcreator_id = 1001
UNION
SELECTcount(*)
FROMmb_post_tbl
WHEREauthor_id = 1001
UNION
SELECTcount(*)
FROMmb_post_tbl
WHEREupdated_person_id = 1001
UNION
SELECTcount(*)
FROMmb_thread_tbl
WHEREauthor_id = 1001
UNION
SELECTcount(*)
FROMevent_tbl
WHEREcreator_id = 1001

Which checks for a specific value in the foreign keys of a few tables. I would expect to see 5 rows in the results of this query, but I do not get 5-- I get a row for each SELECT that has a count > 0, but then I get only one row returned for all tables that have a count = 0. So if there is only one table that has a count > 0, then I get two rows-- value 0, and value 1.

Counting Number Of Valid Rows
We have many kinds of advertisers in our web service:
1.private
2. companies, of which some are members of local enterpreneur community
3. non-profitable communities

Company advertisers can select also a "line of business" while for others
its unavailable. We have a menu where we want to put all the lines of
business in alphabetical order WITH the information, how many companies
(that are ALSO members of local enterpreneur community) are in that line of
business. I made the query following some model. It looked like working,
but now I noticed it doesn't right results always:

SELECT business_lines.*,
IF(seller_id <> 'NULL' AND seller_type='company' AND
seller_membership="LocalEnt", count( * ), 0) as nr_of sellers_in_this_line
FROM business_lines
LEFT OUTER JOIN sellers ON line_id=seller_line_id
GROUP BY line_id
ORDER BY line_name asc

So I suspect that if not ALL companies int certain line are members, that
line results to enpty line. Is that true and how to fix this?

Trying To Count The Number Of Rows In A Result Set After Query
The user fills out this form to sign up to the website, the form checks the database to see if the username has already been taken with the code:

$conn = mysql_connect("localhost:3306", "root", "********")
                                    or die ("Error With Connection");
        echo("connected<br><br>");
        $db_sel = mysql_select_db("game",$conn)
                                    or die ("Error With Database");
        $check = "select * from users where 'username' = '$username'";
        $db_sel = mysql_query($check,$conn)
                or die (mysql_error());

Maximum Number Of Rows Mysql Can Retrive
Basically I want to know the max rows mysql returns for a select. Heard that MSsql would retrive about 100 rows.

Return A Count Of Number Of Rows Before Desired Row.
Anyone know how? find_in_set doesn't seem to be able to do what I want since I am not searching through an array but am actually running a query.

What I really want is to be able to select all until something = something. I've searched the realm of google but cannot come up with anything useful, and so I am wondering if maybe I don't know the right words to be looking for.

Selecting A MINIMUM And MAXIMUM Number Of Rows.
I have a problem where I want to get no more than 10 (LIMIT) of the newest records from a table that are within a month, but I want to get at MINIMUM 3 records, all using SQL.

I can do :

-------------------
SELECT *
FROM updates
WHERE date_of_update
BETWEEN DATE_SUB( CURDATE( ) , INTERVAL 1
MONTH ) AND CURDATE( )
ORDER BY date_of_update DESC
LIMIT 0 , 10
-------------------

To limit it to the 10 updates no older than a month, but if there are no updates within a month I get nothing.

So I would like to do something like :

-------------------
SELECT *
FROM updates
WHERE ROWNUM() < 3 OR ((date_of_update
BETWEEN DATE_SUB( CURDATE( ) , INTERVAL 1
MONTH ) AND CURDATE( )) AND update_id IN (
SELECT *
FROM updates
ORDER BY date_of_update DESC
LIMIT 0, 10
))
-------------------

This code will take the 10 most recent updates and then starts pulling them out as long as the number of rows is less less than 3 or the update is within the date range and one of the 10 recent updates. The problem is that mySQL appears not to have any kind of rownum function.

Limit is a nice substitute except it only works for setting an upper bound, not a lower bound number of records.

Administrator Rows Vs Actual Number Of Records
I imported some table (about 1500 records) using "LOAD DATA LOCAL
INFILE..." (command line console). No warnings, no skipped, no deletes
- all the recored are written to be imported.

However, in MySQL Administrator UI tool I see completely different
number in the "Rows" column. Making a SELECT query shows that the
actual number of records in the table is the correct one (the same
number as in text file table). Command line SHOW TABLE STATUS FROM ...
doesn't show any of these numbers.

I would expect that the "Rows" column doesn't show the actual number of
recored. But, the information about of 100 enteries table is shown
correctly (rows=records=100).

Looping Through MySQL To Change The Id (using PHP) To Equal The Number Of Rows
When deleting a row from the database, that id is now missing.
So what I'm trying to do is update in a loop (maybe an sql loop if
there is one) of all of the id numbers - sort of like renaming them.
It did partly work because all the id's were set to 22. Thats because
there was 22 rows.

Here's the code I used:

Simple Sql Select Does Not Return The Correct Number Of Rows
I have 2668 rows in my table.

select count(distinct ID) from mytable;

gives the following results: 2668

However, when I use:

select ID from uniprot;

Limit Number Of Rows Or Characters Returned In A Text Field
I understand you can limit the rows of a recordset, but can you somehow tell a query to limit the rows (or characters) returned within just a text field?

I have a page that returns abstracts of many articles and I want to truncate the description for each to just 200 characters. Is there a way to accomplish this with MySQL?

Fixed Table, Variable Number Of References To Another Table?
I have two tables A and B. I want to have a column in table A that can reference to zero or more rows in table B. Is there a way to do this without making my table dynamic? I want to keep it fixed. Is there a solution or workaround?

Match Rows In Table B With Rows In Table A
How do I structure a query to match rows in table B with rows in table A where column in B contains strings that contain data from column in A..

Example:

B.part = "abcdefg" matches A.part ="cde"

I cannot put literal in query.. it must be from column data..

It's easy to match rows where columns are equal, but I can't figure out how to get a match with "substring" as shown.

Getting Rows That Are Related To Other Rows In The Same Table
I use a table to save a map using the following structure:

id, x, y, owner

Every occupied map filed has an owner id != 0. The owner id is = 0 for vacant fields.

now the problem:

New registered users need a vacant field on the map. Moreover the mapfields around this field need to be vacant as well! (sqrt((t1.x-t2.x)*(t1.x-t2.x)+(t1.y-t2.y)*(t1.y-t2.y)) <= 5.25)

What I need is a query that gets those fields that have vacant fields around them.

So far, all my tries to solve this problem with Joins/Suvqueries failed.

Two Table Query: Grab Rows From One Table Even If No Related Row In Other Table
PHP

$gettray = mysql_query("SELECT trailers.title,
trailers.link,
trailers.movie,
movie.title AS mtitle
FROM trailers,movie
WHERE trailers.movie=movie.word
ORDER BY trailerid
DESC LIMIT 6",$connm);

It works great, but there is one problem. It will not grab any rows from the 'trailers' table if a corresponding movie row does not exist in the 'movies' table.

I want it to pull ALL rows from the 'trailers' table, even if the corresponding row in the 'movies' table does not exist yet.

If the row does not exist in 'movies', the program than uses the entire trailer title like so

PHP

if($ttray['mtitle']) {
$newttitle = explode("-",$ttray['title']);
$newttitle = array_reverse($newttitle);
$ttitle = $newttitle[0];
$ttitle = $ttray['mtitle'] ."- ". $ttitle;
} else {
$ttitle = $ttray['title'];
}

Thanks
Ryan

Using A Limit Clause, But Return The Number Of Rows Of The Query Without The Limit
I have heard of a cool feature that mysql provides a way to return the number of rows of an sql statement that contains a LIMIT as if the LIMIT had not been there.

I search the mysql manual, but could not find anything.

How To Get The Total Number Of Rows With A Query "limit" ?
I would like to paginate the results of a query on several pages. So I
use a query with a limit X offset Y to display X results on a page,
ok.

But for the first page, I need to run the same query with a count(*)
to know how many pages I will get (number total of rows/ X).

The problem is my query is very slow (maybe 5s) because there is much
worch to do, and on the first page, I need to run this query twice
(not exactly, but ...) so the page is very very slow to load.

My question is : is there a function to get the total number of rows
even on a query with "limit" ? Or what could I do else?

Delete Rows From Table A, Which Dont Exist In Table B (base On Column X)
I have 2 tables identically structured.

A & B

Table A, has column: Product (product code) as primary key

Table B doesn't.

Apart from that they have the exact same fields.

There's also a column: supplier

I want to

Delete * from table A, where does not exist in B (based on column: Product) & where supplier = apples

So to elaborate. Table A is my main table, but it now contains outdated products from supplier apple. Table B has the latest list of products from supplier apple. So I want to remove old products from A that supplier apple no longer makes.

mysql version 4.0.27

ALTER TABLE Deleted The Rows - Error: Table Is Full
Today when I tried to insert data in a table i received the error that 'table is full'. On SHOW TABLE STATUS, I noticed the size of table is grown to 4GB (rows 5359211).

mysql> SHOW TABLE STATUS LIKE 'messages' G
*************************** 1. row ***************************
Name: messages
Engine: MyISAM
Version: 9
Row_format: Dynamic
Rows: 5359211
Avg_row_length: 801
Data_length: 4294967288
Max_data_length: 4294967295
Index_length: 45783040
Data_free: 0
Auto_increment: 5406252
Create_time: 2007-04-20 18:26:38
Update_time: 2007-08-22 09:55:22
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options:
Comment:
1 row in set (0.00 sec)
Here is the table structure.

CREATE TABLE `messages` (
`id` int(11) NOT NULL auto_increment,
`subject` varchar(255) NOT NULL default '',
`message` text NOT NULL,
`attachment_path` varchar(255) default NULL,
`new` tinyint(4) NOT NULL default Ɔ',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

On searching I found the this link.
http://dev.mysql.com/doc/refman/4.1/en/full-table.html

According to manual i executed the following query

MySQL
ALTER TABLE messages MAX_ROWS=20000000000;
I skipped AVG_ROW_LENGTH from the query, I was confused what should be the value for this.

After executing the query, when i check the table status it displayed totally different picture. Now there were only 170109 rows left.

mysql> SHOW TABLE STATUS LIKE 'messages' G
*************************** 1. row ***************************
Name: messages
Engine: MyISAM
Version: 9
Row_format: Dynamic
Rows: 170109
Avg_row_length: 649
Data_length: 110563036
Max_data_length: 281474976710655
Index_length: 1961984
Data_free: 0
Auto_increment: 5409214
Create_time: 2007-08-23 10:07:08
Update_time: 2007-08-23 13:41:57
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options: max_rows=4294967295
Comment:
1 row in set (0.00 sec)
What could be the reason of this rows deletion?

I am on 32 bit system.
MySQL version: 4.1.18-standard-log
Operating System : CentOS 3.x
Memory: 4 GB DDR

Updating Rows In Table B Based On Related Field In Table A
Ver 4.1.8-standard for apple-darwin7.6.0 on powerpc (Official MySQL-standard binary)

I am trying to do some data migration based. I have several tables that contain our legacy pkey field and I want to update the tables with new ID's.
I need to do this several times and have tried it several ways to no avail.

Table A
---------
companyID int(10) pKey
legacyID int(10) old legacy pkey

Table B
---------
bAID int(10) pkey
companyID int(10)
legacyID int(10)

Table A has values for both companyID (unique key) and legacyID.
Table B has values for bAID (unique key) and legacyID but companyID is empty.

I need to update tableB.companyID with tableA.companyID based on tableb.cSerialID to tablea.cSerialID relationship.

I need a query that will update ALL rows.

Table: Max Number Of Rows

In a table what is the limit to the number of rows that make it up? Is the only limitation HardDrive space?

In a table what is the limit to the number of rows that make it up?
Is the only limitation HardDrive space?