MYSQL :: Query Cache: Simple Question

MySQL Query Cache: Should I Cache Small, Simple Queries Or Only Complex Ones?
Query cache works great for long, complex queries, but should I also be caching the simplest of select queries.

For example let's say I had a table with 100 records and I needed to select something using a unique key:

SELECT name FROM products WHERE id = 3
Is caching the above pointless, especially in terms of wasted cache memory, considering how basic it is?

Query Cache
I have some problems with i suppose is the "Query Cache".
I have mysql server version 5 installed.

I have an applicattion with works with odbc 3.51 driver.

The problem is... the effect of query cache when i work with 2 or 3 concurrent sessions in my application.

I'm doing this with a session (session 1):

select * from table...
update table...

In the other session (session 2) i do the SAME select:

select * from table...

I can't see at session 2 the changes of sentence update of the 1st session!! Only i can do this it's work the session and begin.

I supossed this a query cache, i dessactivate it i have tried. Know i have:

query_cache_type = OFF
query_cache_size = 0

Query Cache
I was playing around with the query cache. However, after I set global query_cache_size = 20480; and show variables like 'query_cache_size'; the size shown is still 0. Also tried to change the my.ini file. but still 0. The query_cache_type is set to 1.

Query Cache Help
I have a VB front end that works against a MySQL backend. There is a search module that displays matching records and allows you to edit and delete records. If records are deleted and the user than does another search, the results still display the deleted records even though they are no longer in the table. I am assuming this is a cache issue. I don't want to eliminate the cache in fear of performance degrade but would like to give the user the option to refresh which would clear the query cache. Has anyone done this before or does anyone have a better solution?

Query Cache?
So I'm fairly new to mySQL. I've developed a site in php, and I was wondering how I could speed up the queries. Essentially, every time a page is loaded, it has to run through a database of around 2,500 rows, and it has a bit of a lag every time that occurs. Is there any way to cache the database to speed up performance after the initial load?

Query Cache
Is there any way to see which queries are cached?

Should I Use MySQL Query Cache?
The majority of my website's bottlenecks occur due to the database overhead. This is because I run a user community website, where users can send messages, post comments, read/write forum topics, and view profiles.

I have been studying to solve how to speed up the http and the website, however I was also thinking about using caching techniques for the database as well (as opposed to only PHP and HTTP).

Therefore, since MySQL has it's own Query Cache system, would this be effective. I understand that it would work in a system that has a lot of SELECT queries with little UPDATE and INSERT procedures, but for a user community website which consists of lots of changing data, would it be effective?

When and where should Query Caching be used? My Server has alot of RAM and space, so what else should I look out for?

MySQL Query Cache
Is there a way to save or export the query cache in MySQL? I would like to keep the queries to run again when I change the data in my tables.

Query Cache Adjustments
The query cache is brilliant (in theory), but I find in practice it rarely does much.

The problem is that the cache is flushed after every table insert/update. The benefits of this are obvious (keep query results up to date), but I feel having the ability to adjust how often the cache is updated would be immeasurably beneficial.

If only I could have it updated every 5/10/50 inserts/updates (depending on level of table access).

This could lead to a boon to performance with little problem of data getting stale.

Is there anyway way to do this?

Query Cache - What Gets Pruned?
When the Query Cache is full and something has to be pruned, how is the decision to prune a query made? Is it first in-first out, or least recently used-first out? Can I manually set a priorty on what is removed from the cache first? Is there a "Never Remove From Cache" flag?

Query Cache Issues
I have a MySQL server running 4.0.12 on a 12 CPU Sun U4500 with 12GB of
memory.

With the query cache running, this machine would noticeably "hiccup"
(just stop responding to requests) every so often and wouldn't squeeze
more then 1000 queries per second or so as a result (heavily mixed OLTP
work, with a lot of SELECT's and almost as many UPDATE's).

Without the Query Cache (and no other tweaking), I'm now at over 2100
at the same time of day.

Is there a problem with the query cache that causes MySQL to be far
less scalable then just straight MySQL/InnoDB?

Are there any thoughts on this? Is there a resource specifically for
high performance/high load MySQL implementation/usage?

Understanding Query Cache
when using the search on one of our sites, it takes 4-5 seconds to return a result but if I immediately search for the same thing again it returns instantly due to the Query cache which is great. What seems strange is that 15-30 seconds later it ignores the cache and runs the same query again for a result. Is that normal? It seems like the Query Cache should maintain the query and result until the query cache runs out of memory and starts dumping the oldest records.

Redirecting Query Cache
I am trying to find out how to redirect the mysql query cache to a hard drive.

My goal is to make it usefull again after a restart.

ON DUPLICATE KEY UPDATE And Query Cache
After bludgeoning my head against the table for a bit, I figures out what the problem was that had been plaguing me.

When using a INSERT INTO ... ON DUPLICATE KEY UPDATE ...
statemtent, it seemed like the update was not taking place.
After viewing the webpage in question, (and doing the manual select statement), the old data was being returned.

I couldn't figure out why, until FINALLY, I added 'RESET QUERY CACHE' manually after the statement. Then the correct updated info was returned.

Apparently the query cache is not flushed after using the above ON DUPLICATE KEY UPDATE statement, like it does with other insert or updates.

What do I do now. Just not use that statement? Id like to avoid locking tables if possible. And I cant have the website showing the outdated info.

Weird Query Cache Numbers
I'm running 4.0.18, and the queries in cache variable grew from about 2K
to 30K in a matter of hours when we hardly used the database at all.
Has anyone seen something similar? (The cache size was set to 100M and
cache limit to 5M -

Benchmark Command And Query Cache
I'm trying to optimize my database, and have read about the Benchmark command.

Here is one that I am playing with:
SELECT BENCHMARK(100,'SELECT COUNT(*) FROM table');

I assume this syntax is correct because I don't get any errors. However, this also doesn't return any errors:
SELECT BENCHMARK(100,'Any Invalid SQL Statement');

Also, I am having a hard time understanding how BENCHMARK can be effective regardless of syntax. I'm guessing the first time a query is ran, it will be stored in the QUERY_CACHE. Subsequent iterations of the benchmark command would basically be pointless (because the query is cached and not actually ran against the DB).

Thoughts?

Testing Speed And Query Cache
I'm trying to test performance on some queries with a million of registers on my table, using various keys.

The problem is that the first time i run the query, it takes about 4/5 seconds, but after that it takes about 0.02 seconds. I know that query cache can be flushed with reset query cache, flush query cache, flush tables also modifing some caps at the sql query, but i'll never take 4/5 seconds again.

for example:
select * from table where id=2 order by index_field desc; 4/5 seconds.
select * from table where id=2 order by index_field desc; 0.02 seconds.

select * from table where id=3 order by index_field desc; 4/5 seconds.
select * from table where id=3 order by index_field desc; 0.02 seconds.

etc, etc...

Skip-new Disables Query Cache?
skip-new is explained as follows in the manual: "Don't use new,
possibly wrong routines." (4.1.1 mysqld Command-line Options). Is
there a list of the routines that will be disabled when using this
command-line option?

The manual also states the following: "concurrent_inserts If ON (the
default), MySQL will allow you to use INSERT on MyISAM tables at the
same time as you run SELECT queries on them. You can turn this option
off by starting mysqld with --safe or --skip-new." (4.5.7.4 SHOW
VARIABLES).

So when i was trying to turn off concurrent insterts I used -skip-new
which also disabled query caching. It took me a little while to figure
this out. I'm using skip-concurrent-insert now. Should this section of
the manual be updated?

System Info:
Windows 2000 SP3
mysqld-nt.exe Ver 4.0.13-max-debug for Win

The Query Cache Does Not Return Stale
I am reading up on query cache feature and would like to have the following question clarified.

From mysql 5.0 manual, section 5.14, it says "The query cache does not return stale data. When tables are modified, any relevant entries in the query cache are flushed."

I would like to know what is the definition of "when tables are modified".

does it mean?

1. new records inserted into table?
2. records gets updated?
3. table structure is modified by using alter table command?

Query Cache Not Working: MySQL 5 / Windows XP
I just installed MySQL 5, and its running great except that the query cache is not working, despite the configuration excerpt from my "my.ini"
below:

query_cache_size=5M
query_cache_limit=2M
query_cache_min_res_unit=4096k
query_cache_type=1

From the MySQL command line, if I enter: SHOW VARIABLES LIKE
'have_query_cache';

I get:
+------------------+-------+
| Variable_name | Value |
+------------------+-------+
| have_query_cache | YES |
+------------------+-------+

Also, doing a: SHOW STATUS LIKE 'Qcache%'; gives me:

+-------------------------+---------+
| Variable_name | Value |
+-------------------------+---------+
| Qcache_free_blocks | 1 |
| Qcache_free_memory | 5234168 |
| Qcache_hits | 0 |
| Qcache_inserts | 0 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 450 |
| Qcache_queries_in_cache | 0 |
| Qcache_total_blocks | 1 |
+-------------------------+---------+

I figure the "Qcache_free_blocks" and "Qcache_total_blocks" values of 1
are creating the problem; it's basically telling me that there are no
(okay, 1) free blocks to put my query. However, these values never
change.

The query cache is not vital to me, but it does improve performance, and
I'd like to get it going....

Simple Sql Question: Using A Query Result As A Query Variable
EDIT: it works now, I had an error in my code, not my method.

I have a very simple question.

I have 2 tables: 'users' and 'posts' with the following structure:

users: id, username, email_address
posts: id, user_id, post_title, post_text

in a my own mind's mysql, I would like to:

SELECT posts.id, posts.user_id, posts.post_title, posts.post_text users.username FROM users, posts WHERE posts.user_id = users.id

I usually do one query for the post data, and then, based on the use_id record, do another of the users table, but today, I'm being forced to do them in one swoop.

Simple SQL Query
I was wondering if anyone could help me with this SQL query?

I'm making a football prediction website and I want to be able to display the weekly fixtures in a GridView so the admin can edit, insert, etc.

This is a simple version of the two tables that I have: Fixtures and Clubs...

CREATE TABLE Fixtures
(
MatchID Int PRIMARY KEY,
HomeClubID Int,
AwayClubID Int
)

CREATE TABLE Clubs
(
ClubID Int PRIMARY KEY,
Name Nvarchar(50)
)

.. where HomeClubID and AwayClubID are actually foreign keys to ClubID.

My Problem is that I'd like to create a query that will show each fixture with both the names of the home and away clubs on the same row, eg:

| MatchID | Name | Name |
|--------------------------------|
| 1 | Arsenal | Man Utd |
|--------------------------------|
| 2 | Liverpool | Chelsea |

... etc.

Help With Simple Query
I know this is easy to accomplish, but my brain is fried and I can't figure it out.

I have a few markets (areaID) that vendors belong to. Within these markets, vendors are assigned categories (catID).

I am trying to do a SELECT on the vendors table to find out the total number of vendors to a particular category, within a particular market. So essentially, I want to know the number of vendors within each category within each market. Does that make sense?

Can Anyone Help Me With This Simple Query?
In my database. I want to pull out one record:

Where the date I wish to publish a story where the published_web_date(date) is less or equal to now
and
The published_web_time(time) is less or equal to now

However, using the below query data is nomatter what the published_web_date is if the published_web_time has not elapsed then nothing is shown.

select * from cms_stories
WHERE section = 'news'
AND published_web_date <= NOW()
AND published_web_time <= NOW()
ORDER BY story_id
DESC LIMIT 1";

A Simple Query?
In table "vb_user" I want to pull the data in field "username" and copy that username in another table called "vb_userfield" in a field called "field5". Both tables share the field "userid" which is how the relation is made. I know this is probably very simple but man... I just can't seem to pull it off.

I've got about 500 members and I really want to populate that field "field5" with thier username without having every one of them doing it manually.

Simple Query
I was curious as to what is the best way to determine if a SELECT query was successful in retireving any rows? I've been using..
IF(!$getline){echo "no rows found"
but if there were rows found I would have to run the same query again so I can print them. Is there another way?

$get="select * from orders'";
$getresult=mysql_query($get, $link) or die(ErrorDB($realname));
$getline=mysql_fetch_array($getresult, MYSQL_ASSOC) or die(ErrorDB($realname));

Simple SQL Query
I am looking for some help on a simple (yet beyond my reach) SQL query that I can run via phpMyAdmin whenever I need to.
In a nutshell, I have a Database called A with table B, in which fields C and D sit. For each record, field C has an integer and field D has a human-readable date/time entry in the format: 2005-08-23 17:35:33.
It is important to note that the above date part is YYYY-MM-DD as the convention might be different in your locality.
Anyway, I am looking for an SQL query that will go through the table and whenever the date/time shown in field D is no more than 5 days ago, to add X (some whole number chosen and manually specified in the query each time it's run) to the value in field C

Simple Query
At least I think it should be simple, but I can't get it.

SELECT * FROM 'tableA'
WHERE 'tableA.id' = 'tableB.target_id'

Which returns an empty set, though

SELECT * FROM tableB
WHERE target_id = "b327f34a-54ea-071a-3b9d-451810085fb9"

and

SELECT * FROM tableA
WHERE id = "b327f34a-54ea-071a-3b9d-451810085fb9"

both work. That is to say that there is a record in tableA WHERE, tableA.id = tableB.target_id for AT LEAST one record in tableB

Simple Query That I Can't Figure Out
First off, here's my table:
CREATE TABLE order_info (
ID int(10) NOT NULL auto_increment,
ordernum int(10) NOT NULL default Ɔ',
item_code text NOT NULL,
item_qty int(5) NOT NULL default Ɔ',
item_price text NOT NULL,
have int(5) default NULL,
standby int(5) default NULL,
backorder int(5) default NULL,
refund int(5) default NULL,
`status` int(2) NOT NULL default Ƈ',
PRIMARY KEY (ID),
KEY ordernum (ordernum),
KEY `status` (`status`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 PACK_KEYS=0 AUTO_INCREMENT=477150 ;
I would like to make a simple query that returns ordernum's that match this critera:
All of the items have a 'status' of 3
Have at least 1 'refund'
and I would like the ordernum's returned to be distinct.

Here's the query I had before the requirement of the 'refund' column:

SELECT
DISTINCT order_info.ordernum
FROM
order_info
WHERE
order_info.ordernum NOT IN (
SELECT
order_info.ordernum
FROM
order_info
WHERE
order_info.status != 3
)
AND
order_info.status = 3
I tried adding:

SELECT
order_info.ordernum
FROM
order_info
WHERE
order_info.ordernum NOT IN (
SELECT
order_info.ordernum
FROM
order_info
WHERE
order_info.status != 3
)
AND
order_info.status = 3
AND
SUM(order_info.refund) > 0
GROUP BY
order_info.ordernum
But it returns incorrect information (orders with 0 'refunds').

What is the correct way to make this query?

Bug In A Simple MySQL Query
Having a problem with a very simple query I am trying to execute. Hopefully someone can shed some light on the issue.

SQL Query

SELECT tblUserInfo.PersonalID, tblUserInfo.mainPicLink, tblUserInfo.Location FROM tblUserInfo, tblCoreUser
WHERE tblUserInfo.Orientation = 'Straight'
AND tblUserInfo.Location = 'Hampshire'
AND tblUserInfo.PersonalID = tblCoreUser.PersonalID
AND tblCoreUser.usrSex = 'M'
LIMIT 10;
Error:

Unknown column 'tblCoreUser.PersonalID' in 'where clause'

A Simple Query Question ...
The following returns one row -

PHP

SELECT ab.id, ab.menu_name, ab.keywords, bb.content, NULL , NULL , NULL , NULL , NULL , NULL
FROM menu_management AS ab
JOIN dynamenu_content AS bb ON ab.id = bb.menu_id
WHERE 1 =1
AND bb.publish =1
AND ab.version = 'fr'
AND ab.menu_name LIKE '%Nanotechnologies%'
OR ab.keywords LIKE '%Nanotechnologies%'
OR bb.content LIKE '%Nanotechnologies%'
LIMIT 0 , 30

But the following returns zero rows

PHP

SELECT ab.id, ab.menu_name, ab.keywords, bb.content, NULL , NULL , NULL , NULL , NULL , NULL
FROM menu_management AS ab
JOIN dynamenu_content AS bb ON ab.id = bb.menu_id
WHERE 1 =1
AND bb.publish =1
AND ab.version = 'fr'
AND (
ab.menu_name LIKE '%Nanotechnologies%'
OR ab.keywords LIKE '%Nanotechnologies%'
OR bb.content LIKE '%Nanotechnologies%'
)
LIMIT 0 , 30

In fact I am trying to make a query (which will later be with other queries thro' UNION ALL) where upto ab.version = 'fr' will remain constant, but the following part will change.

Means, among ab.menu_name, ab.keywords and bb.content, there may be all the three, or two or one condition only, depending on user's input. Also, the condition between them can be OR or AND, depending on whether user tends to search for all or any matches.

Simple Between Query Problem
I have multiple fields on my form where a user submits a minimum and maximum value. Such as minimum price and maximum price, so I use a Between in my queries like this.

SELECT COUNT(*) AS 'numrec' FROM tblmls WHERE mlsstatus IN('Active', 'New', 'Back on Market', 'Price Change') AND mlsclass = 'Residential' AND mlslistprice BETWEEN ?' AND ?'
My question is, is there a way to do wild cards using a between statement? Or is there a better way to do this?

Currently if they don't put anything in I don't run that part of the querie, but if they put in a minimum but no maximum I just autosubmit a large number. If they put in a maximum but no minimum I just submit a 0.

Simple Query Problem
I'm a newbie having trouble properly executing a simple query.

I'm trying to make a pathway to prevent tennis players from signing up more than once on a specific date.

Here is my

PHP

$play_date=($_POST['play_date']);
$user_id=$_SESSION['user_id'];

// Make the query to check if the player already signed up on that date.
$query = "SELECT user_id, play_date
FROM table
WHERE user_id=$user_id AND play_date=$play_date
";
$result = mysql_query ($query);
if (mysql_num_rows($result)>0) {

echo '<p><font color="red" size="+2">Sorry, you already signed up to play on this date!</font></p>'

} else {

Although the above code runs, it doesn't prevent one from signing up twice on the same date.

Simple Query Trouble
I have written a simple select query...but it is not doing what I want it to:

$query = "SELECT * FROM helpdeskticket WHERE (`customerid` = '$customerid') AND (`helpdeskticket`.`status` = 'Assigned') OR (`helpdeskticket`.`status` = 'Unassigned') OR (`helpdeskticket`.`status` = 'Can Be Closed') ORDER BY `helpdeskticket`.`ticketid` DESC

Because its wrong i'll explain what I wish it to do. Select all fields from helpdesk ticket where customerid is equal to $customerid, and the status is either assigned, unassigned or can be closed. Then order by ticketid descending.

At the moment it seems to be messing around with the AND and the OR, and is selecting everything from the database table, ignoring the customer id.

Simple Not Distinct Query?
I have a very large product table and believe that some of the fields contain duplicate values when they shouldn't. So I'm trying to create a simple query to identify those that do.. ie something like

Select modelnumber from tbl_product where modelnumber is not distinct

OR

Select NOT Distinct modelnumber from tbl_product.

These obviously don't work (Otherwise I wouldn't be asking for help!), and was wondering if there is a not distinct function that im missing or misusing?

Simple Count Query
I am trying to use the below query to count the number of images held for each book. Unfortunately it is only returning the books with images. I would like all books returned even if they have no corresponding image.

SELECT tblBooks.Title, tblBooks.Description, tblBooks.Author, tblBooks.Annotation, tblBooks.Collection, tblBooks.Price, tblBooks.SortID, tblBooks.Heading, Count( tblImage.ImageID ) AS CountImage
FROM tblBooks
INNER JOIN tblImage ON tblImage.BookID = tblBooks.BookID
GROUP BY tblBooks.BookID

Mysql Simple Query
I am doing a project in mysql and php..
While inserting the data, i made a mistake of inserting date values into the month field and viceversa. can i swap it with a query. I cant take a backup of this table.. because its very big and the webspace for mysql database for me is running very low.

ONE MORE THING :- there are many tables almost 565... can this all be swapped in a single query or procedure.

Simple Null Query
How do you say I want to select all data from this column but only show the data where the data is not equal to null.
I have;

SELECT prevleaving1
FROM `jobemployment`
WHERE prevleaving1 IS NOT null

Simple MySQL Query
I want to do this simple query but I cant remember how... (Ive done it before)...
UPDATE users SET credit = '$credits+10' where user='$user'
Basically whatever is in the credits column gets 10 added to it and the column is updated

Simple Mysql Query
I know this will be simple but I just cant get it to work and I am being tested here by my line manager.
Our database is named: lsql_Category and we have a table column named: Keywords
We have thousands of rows
The column Keywords has data in most of the rows and some without any data at all. Normally assorted and various text words.
I want to clear all data from this coloumn but DO NOT want to delete the coloumn cos we want to input data at later time.
The result should be that the column Keywords remains but will not have any data.
Can someone help? I think it is a select command and a where command but that is all I know.

Simple Mysql Query Not Working
I have a simple table set up listing stockists and there details, included in this table I have a name column and a website column.

I wish to select the name and the website of the stockists only if a website has been entered into the website column.

Here is the query I have tried to use
Quote:

SELECT name, website FROM stockists WHERE website IS NOT NULL ORDER BY name ASC

This query is returning stockists with no website as well as the ones with websites and I donâ€™t know why!

Simple Query? Why Is My Hair Falling Out?
Im trying to pull all records from table a and table b for 14 hrs now. It seems so simple?
both tables are indexed with the fields 'classid' and 'states'
actual results should be 36 records as you can see that is not the case.
Here is what ive tried so far:

SELECT * FROM classifieds_g WHERE states='AZ'

records 4

SELECT * FROM classifieds WHERE states='AZ'

records 32

Samples and results of what I've tried (should return 36 records)

SELECT * FROM classifieds_g, classifieds WHERE classifieds.states='AZ' and classifieds.states = classifieds_g.states

records 0

SELECT classifieds.states, classifieds_g.states FROM classifieds_g, classifieds WHERE classifieds.states='AZ' and classifieds.states = classifieds_g.states

records 0

SELECT * FROM classifieds_g, classifieds WHERE classifieds.states='AZ' GROUP BY classifieds.states

records 1

SELECT * FROM classifieds_g, classifieds WHERE classifieds.states='AZ'

records 4000

SELECT DISTINCT * FROM classifieds_g, classifieds WHERE classifieds.states='AZ' and classifieds_g.states='AZ'

records 128

SELECT * FROM classifieds_g, classifieds WHERE classifieds_g.states='AZ' and classifieds.states = classifieds_g.states

records 0

SELECT * FROM classifieds_g LEFT JOIN classifieds ON classifieds.states = classifieds_g.states WHERE classifieds_g.states='AZ'

records 128

SELECT * FROM classifieds_g INNER JOIN classifieds ON classifieds.states = classifieds_g.states WHERE classifieds_g.states='AZ'

records 128

SELECT * FROM classifieds_g LEFT JOIN classifieds ON classifieds.states = classifieds_g.states WHERE classifieds_g.states='AZ' GROUP BY classifieds.states

records 1

SELECT * FROM classifieds_g LEFT JOIN classifieds ON classifieds.states = classifieds_g.states WHERE classifieds_g.states='AZ' GROUP BY classifieds.classid

records 32 (all the same)

SELECT DISTINCT * FROM classifieds_g WHERE states IN(SELECT states FROM classifieds WHERE states='AZ' )GROUP BY states

records 1

SELECT DISTINCT * FROM classifieds_g WHERE states IN(SELECT states FROM classifieds WHERE states='AZ' )

records 4

Issue With Simple SELECT Query
i have three rows in my articles table. for some reason the query below does not show the first entry in that table, only the last two. is there an obvious reason why this would be the case? im displaying just the $title and the $id, simple enough! i can post database structure if required. stumped!

$queryGetArticles = "SELECT * FROM articles";
$resultGetArticles = mysql_query($queryGetArticles) or die ("couldnt get the data");
$row = mysql_fetch_array($resultGetArticles,MYSQL_ASSOC);

echo "<div id='stories'><ol>";
while ($row = mysql_fetch_array($resultGetArticles)) {
extract($row);
echo "<div class='story'><li><h3>$title (id: $articleID)</h3></li></div>";
}
echo "</ol></div>";

PLEASE HELP*SIMPLE - Mysql INSERT QUERY
And YES its connected to mysql DB i need help (a fix) ASAP thanks

<?

$sql = "UPDATE `games` SET `sponsor` ='$WebsiteURL' WHERE `gameid` =$GameID LIMIT 1";

$result = mysql_query($sql);

echo "$result";

?>

Having Problems Woth This Simple Sql Query!
hi, i have two tables essentially they are the same but one gets all normal file details placed in to it and the other has all the files that have been attached to comments put in to it...it just made programming far easier this way....

Now this seems like such a simple query but i just cant get it to work...

I want to select file_name,file_type, and upload_id from both tables so i can create an archive of all files posted to the site...how do i do this....

its something like

SELECT file_name,file_type,upload_id from uploads, comment uploads ORDER BY date_submitted DESC LIMIT 30

but thats obviously not it....i also tried a join query:

SELECT uploads.*, upload_comments.* from uploads INNER JOIN comment uploads ORDER BY date_submitted DESC LIMIT 30

Simple Select Query Take 5 Secons
This select i've got take 5 seconds and i really don't know why!!!!

The number of rows in any table is NOT bigger than 50 records!

SELECT DISTINCT(j.id) as idunic,j.* FROM jobs j
INNER JOIN jobs_categs jc ON j.id = jc.id_job
INNER JOIN jobs_type jt ON j.id = jt.id_job
INNER JOIN jobs_cities jci ON jci.id_job = j.id

WHERE j.status = 'OK'
AND j.deleted = 'NO'
AND j.suspend = 'NOK'
AND j.date_end > NOW()
AND jci.id_city = ƌ'

ORDER BY j.date_begin DESC LIMIT 0, 25

Simple Query Question: LIMIT
I'm looking to list all the rows in a database, but skipping the first 5. I know that I can use "LIMIT 0,5" to get the first 5 results, but what query do I use to list everything from 6th result onwards?

Need Help Formulating (somewhat) Simple MySQL Query
I'm more experienced in PHP, but not very experienced in MySQL. I really know nothing of joins, left joins, right joins, unions, and so on. Naturally, some of my code is becoming extremely cluttered because I don't know anything about these things. Sooo... I really need to get off my rear and learn how to manage data better.

I have two tables: users and news.

NEWS:

news_id
news_title
news_authorid
news_timestamp
USERS:

user_id
user_username
user_displayname
user_password
You'll notice that in each and every one of my news posts, it stores the author id of the user that posted the news. It'd be nice to just enter in the name, rather than an id, right? But the problem is, usernames are becoming somewhat dynamic, so it's useful to use the user's id as reference so we can select whatever we want about a user.

My question is, how can I "join" these two tables to get the user's display_name when selecting and displaying data from my news table? I could go like this:

$myfancydbclass->query("select * from news order by when_it_was_created");

while ($this)
{
$myfancydbclass->query("select * from users where user_id = $row->news_authorid");
}
But is there a way I can "join" the two tables so I dont have to run two queries just to get the news and user's display name (use fields user_id and news_authorid to join the two)? I hope I've made my question clear. If you don't understand what I'm asking, ask me a question back. As you can tell, I know nothing about this. Basically, what would the query be to join these two tables?