hello,
ususally we use :
select * from table limit 50;
This will display the rows which were entered first the table created
(i..e, that end);
if i wnat to select from the other side then what should i use ?
if there is a serial no column like id or some autoincremt column or DATE
then we
Hi,
Here is my problem :
I want to copy datas from an existing website to my local website.
The website is a collection of images with thumbnails.
With phpMyAdmin, i made an export of the image table and i have a 16 MB
file 'image.sql' containing sql orders to create table and insert
values.
Hi Dan-
Thx for responding. And yes, I think you're absolutely correct. Let me update
that query - should look like:
sql
select
a.k1,
a.k2,
a.total_amt
from Z a
where a.total_amt in
(select b.total_amt
from Z b
where b.k1 = a.k1
order by b.total_amt desc
limit 10)
Hi,
We have done the following test, which boils down to a simple connect and then
a select * from accounts; (accounts=MyISAM, 3 records, 3 columns).
Clientside: A stable win32 app capable of using any libmysql.dll
Serverside: 4.1.7-nt win32 MySQL service (stable download), with vanilla setup
Joakim,
please post the FULL .err log, the full output of SHOW PROCESSLIST and SHOW
INNODB STATUS, as well as your my.cnf.
Please also post the output of the Unix 'top'.
Best regards,
Heikki Tuuri
Innobase Oy
Foreign keys, transactions, and row level locking for MySQL
InnoDB Hot Backup - a hot
Daniel,
- Original Message -
From: [EMAIL PROTECTED]
Newsgroups: mailing.database.myodbc
Sent: Thursday, December 02, 2004 8:30 AM
Subject: Re: MySQL 5.0.2-alpha has been released
wow this is a massive feat, 5 will make many people proud, 4.1 has done
the same aswell as 4.0.Well done,
On Tue, 30 Nov 2004 19:24:05 +0200, Gleb Paharenko
[EMAIL PROTECTED] wrote:
The first impression is that you forgot to convert character
columns. See:
http://dev.mysql.com/doc/mysql/en/Upgrading-from-4.0.html
http://dev.mysql.com/doc/mysql/en/Charset-conversion.html
Once the Character
To select row 10 to 30 below query might be useful
select * from mytable limit 10,20;
The query will list 11th record to 30th record.
N. Kavithashree wrote:
hello,
ususally we use :
select * from table limit 50;
This will display the rows which were entered first the table created
(i..e, that
Hi All,
In oracle I can query user_constraints, user_indexes for getting the
constraints and indices for a particular table.
User_constraints and user_idexes are view which holds all the
constraints and indices for a particular table.
Need to know the similar one in MySQL. Do we have views
Thats usually setup in the same table schema no ?
On 02/12/2004, at 9:52 PM, [EMAIL PROTECTED] wrote:
Hi All,
In oracle I can query user_constraints, user_indexes for getting the
constraints and indices for a particular table.
User_constraints and user_idexes are view which holds all the
[EMAIL PROTECTED] wrote:
Thanks for the reply. The main aim is to select the first record or
the last record. Is there any direct command for these. Please help me
in this.
There is no first or last unless there is a sort order.
To get the first row:
select * from table
order by col1
limit
[EMAIL PROTECTED] wrote:
Need to know the similar one in MySQL. Do we have views or any other
system tables in MySQL 4.0.21 which OUTPUTS the constraints and indices
in a particular table?
- show indexes from DATABASE_NAME.TABLE_NAME
- or, show create table DATABASE_NAME.TABLE_NAME;
- ian
--
Hi,
Thank you. But I want select the constraints and indices used on the
table. How can we get this information?. Please help me in this.
Thanks,
Narasimha
-Original Message-
From: Ian Sales [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 02, 2004 5:07 PM
To: Lakshmi NarasimhaRao
Hi, All
It's happen after upgrade from 3.23.46.
Just look at this set of queries
mysql select 1 or null;
+---+
| 1 or null |
+---+
| 1 | - Ok
+---+
1 row in set (0.00 sec)
mysql create table a ( a int not null );
Query OK, 0 rows affected (0.00 sec)
mysql select
[EMAIL PROTECTED] wrote:
Hi,
Thank you. But I want select the constraints and indices used on the
table. How can we get this information?. Please help me in this.
Ian gave you the answer:
From: Ian Sales
[...]
- show indexes from DATABASE_NAME.TABLE_NAME
The syntax is: SHOW INDEX FROM
Hello Vlad,
The reason is: If one or both arguments are NULL, the result of the
comparison is NULL, except for the NULL-safe = equality comparison
operator.
Thereore, or NULL in your select statement will always returned NULL.
You can find all the rules for comparaison at URL:
I have a select, from, where, query set up.
There are a number of inner joins in it as well.
Now what I noticed is if there are some null fields in
the records, nothing will get returned. If I remove
those particular joins (where the NULLS are), the
record is returned.
Does this sounds like a
Hi,
beehive KG is looking for authors to write articles about advanced
MySQL topics.
Please go here for our writer's guidelines:
http://www.beehive-eu.com/MySQLAuthors.html
Cheers,
Mark Pratt
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Stuart Felenstein wrote:
I have a select, from, where, query set up.
There are a number of inner joins in it as well.
Now what I noticed is if there are some null fields in
the records, nothing will get returned. If I remove
those particular joins (where the NULLS are), the
record is returned.
Bernard Clement wrote:
Hello Vlad,
The reason is: If one or both arguments are NULL, the result of the
comparison is NULL, except for the NULL-safe = equality comparison
operator.
Thereore, or NULL in your select statement will always returned NULL.
You can find all the rules for comparaison
Vlad Shalnev wrote:
[...]
OR
||
Logical OR. Evaluates to 1 if any operand is non-zero, to NULL if any
operand is NULL, otherwise 0 is returned.
This definition (from the manual) is self-contradicting: 1 OR NULL
should evaluate to 1 because any operand is non-zero, but it should
also evaluate to
Hi
This definition (from the manual) is self-contradicting: 1 OR NULL
should evaluate to 1 because any operand is non-zero, but it should
also evaluate to NULL because any operand is NULL.
Why self-contradicting ? If you apply this rule as described ( from left to
right ) you will get correct
When the server begins to slow down, what does top reveal?
Andrew Nelson wrote:
The reason I ask is because eight select statements should not bog
down a production server. On the MySQL side, is anything being
written to the slow query log? On the application side is there any
virus scanning
Hello,
Does anyone know when MySQL cluster will become available for Windows?
Thank you in advance,
--
Vlasis Hatzistavrou,
System Administrator,
Hellenic Academic Libraries Link (HEAL-Link),
Library of Physics Informatics,
Aristotle University of Thessaloniki,
email: [EMAIL PROTECTED]
Phone: +30
Andrew,
DO you have the slow query log turned on? What does one of your tables look
like and the one of the 8 queries you talk about? It very well could just
be a index problem.
And what is the size of the data.
Donny
-Original Message-
From: Andrew Nelson [mailto:[EMAIL PROTECTED]
Hi!
On Dec 02, Vlad Shalnev wrote:
Looks like a bug.
Could you submit a bugreport at http://bugs.mysql.com ?
It happens after upgrade from 3.23.46.
mysql create table a ( a int not null );
Query OK, 0 rows affected (0.00 sec)
mysql select min( a ) is null or null from a;
Suggestions intermixed with your questions below. However, because you
only described your table and neglected to post the actual CREATE TABLE
statement, I will need to make a few assumptions (the actual name of your
table and the fact that missing data is stored as nulls are two I can
think
I think you need to add some kind of uniqueness to your table. Either a
date column (dates are only accurate to the nearest second which may not
be fine enough precision for your situation) or an auto_incremented
integer-type column (make sure you select the correct storage size for
your
Those types of queries will be available soon as the INFORMATION_SCHEMA
views are in development. Keep your eyes on the next few releases of
MySQL for this feature to appear (it may already be active in the 5.0.2
release just announced but I haven't had time to check yet). Until then
you will
Vlad Shalnev wrote:
* from the manual:
Logical OR. Evaluates to 1 if any operand is non-zero, to NULL if any
operand is NULL, otherwise 0 is returned.
* Roger Baklund:
This definition (from the manual) is self-contradicting: 1 OR NULL
should evaluate to 1 because any operand is non-zero, but it
Two tables (simplified, because other fields are not used in query; indexes
other than primary key removed):
CREATE TABLE `msg_content` (
`msg_id` int(14) NOT NULL auto_increment,
`subject` varchar(255) NOT NULL default '',
`content` mediumtext NOT NULL,
PRIMARY KEY (`msg_id`),
)
Stuart,
Comparing anything to null, including another null, will always return
false. This is why you query is returning no results when the clauses that
reference columns that contain nulls are included.
Regards,
Eric
Stuart Felenstein [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
I do not have access to the server at the moment to do this, but was
planning on it. I was just curious if I could point our admin people in
the right direction(s).
Thanks,
Scott
-Original Message-
From: Victor Pendleton [mailto:[EMAIL PROTECTED]
Sent: Wednesday, December 01, 2004
I am trying to install mysql from source but I am having problems with the
berkeley db part. When I type make install I get this:
Making install in bdb
make[2]: Entering directory `/home/steve/mysql-4.0.22/bdb'
make[2]: Nothing to be done for `install'.
make[2]: Leaving directory
You are overthinking the issue.
mysql SELECT VERSION();
+---+
| VERSION() |
+---+
| 4.1.7 |
+---+
1 row in set (0.00 sec)
mysql SELECT 1 OR NULL;
+---+
| 1 OR NULL |
+---+
| 1 |
+---+
1 row in set (0.00 sec)
We do not need to know x to
On Tuesday 30 November 2004 04:44 pm, Greg Macek wrote:
OK, sounds like what I should do is the following:
* Upgrade current mysql install (3.23.49) to latest stable 4.0 series
(4.0.22 according to the website)
* Test out all applications and make sure everything is working as
expected.
*
Michael Stassen wrote:
You are overthinking the issue.
Probably. :)
mysql SELECT VERSION();
+---+
| VERSION() |
+---+
| 4.1.7 |
+---+
1 row in set (0.00 sec)
mysql SELECT 1 OR NULL;
+---+
| 1 OR NULL |
+---+
| 1 |
+---+
1 row in set (0.00
-Original Message-
From: Roger Baklund [mailto:[EMAIL PROTECTED]
This definition (from the manual) is self-contradicting: 1 OR NULL
should evaluate to 1 because any operand is non-zero, but it should
also evaluate to NULL because any operand is NULL.
URL:
Roger Baklund wrote:
snip
This is (as I see it) a documentation issue, I was not trying to say
that Vlad was wrong.
Right, that's why I'm copying the docs list.
While we're at it: the term non-zero... what does it mean? As we
all know, NULL != 0, and 0 == zero, consequently NULL must be
On Thursday 02 of December 2004 01:15, Michel RENON wrote:
Hi,
Here is my problem :
I want to copy datas from an existing website to my local website.
The website is a collection of images with thumbnails.
With phpMyAdmin, i made an export of the image table and i have a 16 MB
file
I upgraded from 5.01 to 5.02 and now I am getting the error localhost is not
allowed to connect to this MySQL server. What should I do, root cannot
connect a well. I'm currently using win32 and have old-passwords in my.cnf
Thanks
--
MySQL General Mailing List
For list archives:
Sorry, forgot to change the subject in previous message.
I upgraded from 5.01 to 5.02 and now I am getting the error localhost is not
allowed to connect to this MySQL server. What should I do, root cannot
connect a well. I'm currently using win32 and have old-passwords in my.cnf
Thanks
--
Hmmm, found the problem. In previous versions the installer did not delete
and write over existing tables in the mysql database. Good thing I had the
database backed up. Be careful all...
Fredrick
- Original Message -
From: Fredrick Bartlett [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
At 11:42 -0500 12/2/04, Michael Stassen wrote:
Roger Baklund wrote:
snip
This is (as I see it) a documentation issue, I was not trying to
say that Vlad was wrong.
Right, that's why I'm copying the docs list.
I updated the description to account for the cases when there are 1 or 2
NULL operands.
Hi!
InnoDB is the MySQL table type that supports FOREIGN KEY constraints,
row-level locking, Oracle-style consistent, non-locking SELECTs, multiple
tablespaces, and a non-free online hot backup tool.
Release 5.0.2 is a snapshot of the 5.0 development branch of MySQL.
Unfortunately, this
Is it possible to append rows to a table packed by myisampack?
Thanks,
Jacob
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MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Hi all,
In version 4.0.18 when setting the wait_timeout variable to 10 in
my.cnf, it seems to work when looking at 'mysqladmin variables' as it is
indeed showing up as 10.
However, when in the mysql client and I do a 'show variables' it is
showing up with the default value of 28800.
I'm certain
We are considering migration to mysql 4.1. innodb. So I've made some tests
comparing innodb and myisam performance. Innodb was very very slow, so I
suspect something is wrong. It can't be so bad!
Mysql 4.1.7 on Linux (binary from www.mysql.com).System - Duron 800MHz, 500MB
RAM. Myisam database is
Yes.I know that 3 - 4.0 - 4.1 is the recommended way but It will cost a lot of
downtime. So I decided to do 3-4.1 way.
The part that I am not quite sure is the converting the database. Why it is
needed? If I just copy the old db and run the 4.1?
I 've not found clear explination in the docs.
I've
If you have direct MySQL tool access to your existing data you could
re-export your data using the mysqldump tool and set the
--max_allowed_packet option to the same value as the max_allowed_packet
size for your new server. That way, if you source the resulting dump
file into your new server,
When I try to connect from a remote client 5.02 shuts down with no errors
reported in .err file.
Fredrick
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MySQL General Mailing List
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To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Howdy all,
quick question about how INNODB handles locks. If
autocommit is off and I perform a select statement
without then issuing a commit, will INNODB remove any
read locks that it issued? I would assume that the
locks would be removed when the statement finished.
Just want to verify that
I am trying to execute this query and it is failing with Table is full error
(I know I can make temp tables big).
update t1, t2
set t1.XXX=1
where t1.YYY=t2. and t2. like '%X%';
My t1 has 10,00,000+ records and t2 has about 70,000 records. I would like
to know how can I optimize this
Hristo Chernev wrote:
We are considering migration to mysql 4.1. innodb. So I've made some tests
comparing innodb and myisam performance. Innodb was very very slow, so I
suspect something is wrong. It can't be so bad!
Mysql 4.1.7 on Linux (binary from www.mysql.com).System - Duron 800MHz, 500MB
I am using the MySql Administrator tool to schedule weekly backups on my
databases. I have defined the databases I want backed up and how often,
plus where to store the data. I ran a sample, but it appears that just
the structure is being backed up, not the data in the tables as well.
How do
Greetings,
I am sorry if I am asking a question that has already been answered
somewhere. If it was and you know where - please let me know.
I am trying to give access to a user, who should have access to a
specific database with over 200 tables and should not have access to one
or two of
I am an web designer / php programmer / unofficial network administrator
with a well-rounded technical background - but, as they say, a jack of all
trades (expert in nothing). If I were to pursue a DBA path, what would be a
good way of going about it? School, books, etc...
- Eve
--
MySQL
Greetings,
I am sorry if I am asking a question that has already been answered
somewhere. If it was and you know where - please let me know.
I am trying to give access to a user, who should have access to a
specific database with over 200 tables and should not have access to
one or two of
Hristo,
if you are doing INSERTs, UPDATEs, or DELETEs, try setting
innodb_flush_log_at_trx_commit=2
But read the caveats in the manual. You can also set innodb_buffer_pool_size
bigger.
Best regards,
Heikki Tuuri
Innobase Oy
Foreign keys, transactions, and row level locking for MySQL
InnoDB Hot
MySQL Query Browser 1.1.2 causes 5.02 mysqld-nt.exe server crash as well
remote and local.
Fredrick
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Has anyone ran into problems where mysql_num_rows() return 0 when the result
set clearly contains a certain number of rows? My C code looks something
like this:
mysql_query(conn, show databases);
result = mysql_store_result (conn);
numRows = mysql_num_rows (result);
On an HP 11.11 machine
MySQL to return wrong results if a SELECT uses two indexes at the same
time
Does mysql 5.0.x have the ability to use more than one index per table
on a select ? We had to rewrite a simple
select id from table_a where last_name like 'smith%' and first_name
like 'john%'
to
select id from
I am afraid you have read the docs correctly. Privileges exist at 4
levels: Global, Database, Table, and Column. So, for someone to only see
part of a database, you have to GRANT permissions to the specific tables
that user gets rights to work with. No other way around it.
However, you may be
Hello everyone,
I have a question on how MySQL database write to binlogs in replication
environment. My table type is MyISAM. MySQL version is 4.0.21.
I have a replication farm. Let's suppose I am running a ALTER TABLE
statement on central master and had a syntax error in table name.
Hello Everyone,
I have a question on using LOAD DATA command in cross database
replication setup. MySQL version is 4.0.21
I have replication farm where few slaves have been set up as cross
database replication slave by using (replicate-rewrite-db).
When Load data command get executed
DVP
Dathan Vance Pattishall http://www.friendster.com
-Original Message-
From: Sanjeev Sagar [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 02, 2004 4:04 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Cc: Sanjeev Sagar
Subject: Binlog question in replication setup
I am using the MySql Administrator tool to schedule weekly backups on my
databases. I have defined the databases I want backed up and how often,
plus where to store the data. I ran a sample, but it appears that just
the structure is being backed up, not the data in the tables as well.
How do
I'm very new to mysql and replication. I've got a case where I have 2
servers, each have database A and database B. I want server 1 to be
master for database A and slave for database B and I would like server
2 to be slave for database A and master for database B.
From what I've read, if a
I have an application which keeps a table of daily event counters related
to other records in a databse. Since the trackingrecords are kept on a
daily basis new records are created each day for items being referenced.
In pseudo-code:
// Check for the existance of daily tracking record
SELECT
Hi ALL,
I have an application that reads files converts them and then inserts
them into a database. It has 2 columns that I need help with.
First is the OFFSET column - this stores the datafile offset ..
In C it is a UNSIGNED LONG and looks like : 0x2528
the second colun is a CRC for the
Is this a typical situation? If those 1 or 2 tables have higher security
requirements than the rest, so some users should have access to all the
tables except them, another option would be to move them to a separate db.
Then you could grant the average user access to the db with the rest of
Sergei Golubchik wrote:
Hi!
On Dec 02, Vlad Shalnev wrote:
Looks like a bug.
Could you submit a bugreport at http://bugs.mysql.com ?
I've submitted a bugreport.
Downgrade to 3.23 and wait for this problem solving.
Thanks for all
It happens after upgrade from 3.23.46.
mysql create table a ( a
Hi Vlad !
Why not using
select (select min( a ) is null from a) or null;
as a workaround ?
Regards,
Jocelyn
- Original Message -
From: Vlad Shalnev [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, December 03, 2004 7:01 AM
Subject: Re: Comparing bug in 4.1.7
Sergei
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