MYSQL :: How Do I Write Multiple Conditions In An MySQL IF Statement?

Conditions In UPDATE Statement
i have some data to be updated in a specific row - WHERE id=1

data:
$min_time, $max_time, $time, $attempts

so, i would like to calculate new avg and replace min_time with new value, if new min_time is smaller then that one stored in the database.

"UPDATE mytable SET
avg=(avg*attempts+$time) DEV (attempts+1),
min_time=**here i could use help** ??IF(min_time>$min_time)$min_time ELSE min_time??
**and similar with max_time .

Need Help With Multiple WHERE Conditions...
i'm wondering if anyone knows how to have multiple WHERE conditions...i'm using php/mysql as my programing languages...

example --> SELECT * FROM table WHERE rid=$ride && uid=$userid && accepted=Ɔ'

I need help selecting rows where all three of the conditions above are met...anyone knows how to do this?

Select With Multiple Conditions
I've a table called tag_log.

In this table are two columns called tag_id and sub_id. This table is used to link tag names to stories.

I'm trying to write the query for a search. The search is looking for all the sub_id that matches the tag_id given.

Example of what I have currently:
select distinct(sub_id) from tag_log where tag_id in(101, 102, 103);

In the above example, it was performing a union instead of what I really want. It was returning results that have either one or all of the tags.

What's required is for the story to have ALL the three tags. It's should be like a typical search, where the more search terms you enter, the more focused the results will be.

Specify Conditions For The Left Side Of A Multiple Left Join
I'm doing a left join that looks like this standard example:

SELECT t1.c1, t2.c2, SUM(t3.c3)
FROM t1
LEFT JOIN t2 ON t1.c1=t2.c1
LEFT JOIN t3 ON t1.c1=t3.c1
GROUP BY t1.c1

The problem is that I also want to specify a condition for selecting records from t1:

WHERE t1.c1='x'

so that only the records with that value in c1 will be returned on the left side of the join. I don't know where to put this in the SQL.

Select Statement With Multiple Counts/multiple Joins Trouble
SQL
SELECT g.group_id, g.name, g.description, g.icon, g.user_id, g.date, u.username, count(c.comment_id) as comment_count, count(v.video_id) as video_count, count(m.user_id) as user_count
FROM duo_groups as g
LEFT JOIN duo_group_members as m on m.group_id=g.group_id
LEFT JOIN duo_users as u on u.user_id=m.user_id
LEFT JOIN duo_videos as v ON g.group_id=v.group_id
LEFT JOIN duo_video_comments as c on v.video_id=c.video_id
GROUP BY g.group_id, g.name, g.description, g.icon, g.user_id, g.date, u.username
Will return

My current problem with the above statement is with the counts. The count is accurate when only one of the counts is returned. However when more than 1 of the counts is returned the other counts (if they are not 0) will return the same number. For example look at the screenshot above. The first row, all three counts are the same but they are not accurate. They alll point to 8 because there are 8 comments, but there aren't 8 videos or 8 users. Same with the second row. There aren't 2 users only 2 videos.

Search And Write, Or Write And Recover?
The problem: I need to generate a 'unique string' for each row in a table. I already use auto_increment for system dependencies between tables.

What is the best approach one of these or another?

After generating a candidate 'unique string' the two strategies that came to mind are:

1. to then search the table's column to see if it is already assigned; locking the table for write while searching and writing the new row, or

2. set the column to UNIQUE when defining the table. Just go ahead and write the new row if you get a "non-unique" exception, generate another 'unique string' and try again.

I've tried both on a small XP laptop and get "lock timeout exceptions" rather quickly using #1. But replace those with lots of re-writes when there starts to get "collisions" of 'unique string's.

MySQL 5.0 And OR Conditions
I have heard that version 5.0 of MySQL has performance gains for "OR" conditions. Can anyone confirm this? If so, how significant are the performance gains over 4.1?

For instance, I am referring to something like: SELECT * FROM some_table WHERE this_thing = 'something' OR that_thing = 'whatever';

Multiple Insert Statement
Just wanted to know whether its possible to insert multiple feilds in different tables inj one nested query
There are nested queries for SELECT statement like join etc
Is it possible in case of INSERT statements as well

How To Set Multiple Statement In MyODBC Connectionstring
http://dev.mysql.com/doc/refman/5.0/en/myodbc-configuration-connection-parameters.html
If I want to set multiple command lines in "stmt" parameter, how to do that?

My current connection string
strConn = "Driver={MySQL ODBC 3.51 Driver}; Server=localhost; CharSet=utf8; Port=3306; Option=0; Socket=; Stmt=SET names 'utf8' Database=yyy; Uid=xxx; Pwd=zzz;"

Multiple COUNT() In SELECT Statement
SELECT
COUNT(s01_Products.id)
FROM
s01_Products
LEFT JOIN
s01_Attributes
ON
s01_Attributes.product_id = s01_Products.id
LEFT JOIN
s01_Options
ON
s01_Options.attr_id = s01_Attributes.id
WHERE
(
s01_Products.active = 1
) AND (
(
LEFT(s01_Options.prompt,5) = "Small"
) OR (
LEFT(s01_Options.prompt,2) IN (28,30)
)
)

SELECT
COUNT(s01_Products.id)
FROM
s01_Products
LEFT JOIN
s01_Attributes
ON
s01_Attributes.product_id = s01_Products.id
LEFT JOIN
s01_Options
ON
s01_Options.attr_id = s01_Attributes.id
WHERE
(
s01_Products.active = 1
) AND (
(
LEFT(s01_Options.prompt,6) = "Medium"
) OR (
LEFT(s01_Options.prompt,2) IN (32)
)
)
And one for Large and Extra Large...

I would obviously like to combine all 4 queries in to 1 so that I can get my 4 counts in a single,

Select Statement From Multiple Tables
how can I do this type of join:

table1: id, value1, value2
table2: id, value1, value2
table3: id, value1, value2

the "id" is a product code
the values are new & used pricing

I need a select that can join all this data, and fill 0's if an id is
not listed in a gven table, then output to a file like so:

id, table1.value1, table1,value2, table2.value1, table2.value2,
table3.value1, table3.value2

obviously, if I join on all the ids, it only will output the values
that have the same id in every table. how do I get that plus all the
values that are unique to each table?

LAST_INSERT_ID With Multiple INSERT Statement
i have the following question:

When inserting many entries into a table with 1 auto_increment key-attibute
(say attribute user_id) and one data attribute (say attribute name)

CREATE users(user_id int key auto_increment, name text)

like

INSERT INTO users(name) VALUES ('pete'),('josh'),('carl')

When the inserting is done in a concurrent way (say 5 scripts do inserting operations like the one above) how do I get the autoincremented ids for all the inserted rows ? I know that LAST_INSERT_ID() yields the autoinc id of the first inserted row (of the multi-insert statement) say 1002 for 'pete' in this case and is also concurrent-safe. But is the insert statement atomic that i can assume that the subsequent generated ids for 'josh' and 'carl' are consecutive i.e. 'josh' gets 1003 and 'carl' gets 1004 when many scripts insert into this table ?

I dont want to use a subsequent SELECT statement to fetch the auto_incremented ids.

How To Write This In MySQL?
I Want to check if a certain value doesnt exist in a ceratain field in
my table as a condition.

"select id from employees inner join
translog on employees.emp_id=translog.empid
inner join outofofficedays on
employees.emp_id=outofofficedays.emp_id inner join holidays
where (here is my question: &#55614;&#57159;-04-02'
doesnt exist in the column translog.vtransdate)
and (&#55614;&#57159;-04-02' not between holidays.H_START and H_END)
order by translog.vTransDate,employees.emp_id limit 1"

Write A Mysql Db Onto A Cd
how to write the db of a mysql on one system onto a cd so as to copy that db to the mysql on another system.
The 2 systems are not connected to each other.

Syntax For Multiple Table Sql Select Statement
I have 3 tables as below:

Room (roomId, noBeds)
RoomBooking (roomBookingId, bookingId, roomId)
Booking (bookingId, checkInDate, stayLengthNights)

where Room is linked to RoomBooking by roomId, and RoomBooking is linked to Booking by bookingId.

What I am trying to do is list all of the rooms available for rent between 2 inclusive dates. The statement I have sofar is below, and I understand in the first half of the statement in the where clause is not correct but I just cant figure out how to do it.

Code:

Multiple Items In An ALTER TABLE Statement
Was in the midst of doing something today and I attempted to drop a
number of columns in a table with the following:

ALTER TABLE tmp DROP COLUMN col_1, col_2, col_3, col_4;

Unfortunately MySQL gave me an error reading:

ERROR 1064: You have an error in your SQL syntax. Check the manual
that corresponds to your MySQL server version for the right syntax to
use near 'col_2, col_3, col_4' at line 1

Can you not have multiple columns names in an alter statement?

Multiple Prepare Statement Inside The Procedure
I'm trying with the multiple dynamic queries inside the stored procedure means, inside my stored procedure i want to execute Multiple queries (DDL and DML). for that i'm storing query in variable and then executting it by prepare stmt.

It works fine with singal prepare stmt and failes for the multiple prepare stmt.

Is there any solution to execute multiple queries inside the Stored procedures or Functions?

Accessing Multiple Tables With A Select Statement
I am writing a select statement, that says something to this effect. Select * from texas, california, oklahoma; Everything in each table is going to be the exact same. as far as city, name, and zip...they are the titles of my fields. But when I go and look at this file, it just shows everyone from oklahoma. If take out out oklahoma, then it shows everyone from california but not texas. What is the proper way to do this?

MySql Write Vs Read
Essentially I am faced with a design choice;

have an oft run (modifiable) query run every time any user wants to
run it, comparing criteria againt each and every user in the table and
delviering list OR saving that list (user/user/) so the next time all
that needs to be queried is the existence of a record in the table.

The basic tradeoff; version 1 there are many simultaneous queries of
the user db on complex search criteria; version 2 there are fewer but
their are as many far more simple queries to a much larger table, not
to mention many writes to same to keep the table current.

I know this is pretty vague, but I was wondering if in general there
is an area that mysql excels in vis a vis complex query smaller tables
simple query larger tables.

Question 2 is there anyway to guestiate the search/write times of a
user log in to both query and update? #Records, fields, etc? I'd like
to keep log in to < 10 seconds max.

Vita And Write In MySQL
My web site use a odbc to a MySQL database. I create it on XP and it's worked but I'm now on vita and the data base on a 2003 server. All the reading access on the database are ok but all the writing access are denied. I haven't error message just error 500 on ie7.

Write/Move/Save Pdf To MySQL Table?
Is upload the only way to pass a file to a table?

I have a contract.pdf which is generated via php (FPDF) and saved in a temporary file. I need that file then moved /written to the appropriate customer table in our database (MySQL ) so that the temporary file may then be overwritten by the next Customer/Order.

While I am able to upload the file via <input type="file" name="uploadpdf> and related uploader.php, asking our web-users to “browse” for the file does not suit our needs, and of course adding a default value

<input type="file" name="uploadpdf" value="http://localhost/crm/modules/Orders/contract.pdf"> doesn’t work either.

As the file is always the same (modules/Orders/contract.pdf) how may I manage that move automatically, (say with a ‘Confirm Order’ button) to the database?

Performance Between Multiple INSERT Statements Vs Single Statement With Lots Of Data
$sql1 = "INSERT INTO mytable VALUES ("zzz","xxx")";
$result = mysql_query ($sql1);
...
$sql1000 = "INSERT INTO mytable VALUES ("zzz1000","xxx1000")";
$result = mysql_query ($sql1000);
vs

$sql = "INSERT INTO mytable VALUES
("zzz","xxx"),
...
("zzz1000","xxx1000")";
$result = mysql_query ($sql);

is there any performance difference between the 2?

btw, there could 1000-5000 row inserts.

Mysql Client Dont Write Russian Characters
I installed MySQL 5.0.24 and have so problem.I can't type russian characters in mysql client. Database has data in koi8 encoding (from dump, from php form...) and this data correctly shown.But when I switch encoding to russian in mysql client cursor stops moving independent from my keys pressing,when switch it return to English and typing continued.For example,I enter: select fld from tbl where fld="russ",if "russ" in koi8 I cann't type this characters.
It is possible type russian characters from OS command line: mysql -p -e "select fld from tbl where fld='russ'" dbname. In this case whole query text will be entered and correctly executed.
If anybody know how possibly decide this problem write me please.
My OS is ALTLINUX 3.0 : LANG=ru_RU.KOI8-R
MySQL's variables:
| character_set_client | koi8r
| character_set_connection | koi8r
| character_set_database | koi8r
| character_set_filesystem | binary
| character_set_results | koi8r
| character_set_server | koi8r
| character_set_system | utf8
| character_sets_dir | /usr/local/mysql-standard-5.0.24-linux-i686/share/mysql/charsets/ |
| collation_connection | koi8r_general_ci
| collation_database | koi8r_general_ci
| collation_server | koi8r_general_ci

How To Change Read/write Permission On Mysql Data Base.
I had a total crash and the server guy gave me all my data in a hand basket.. just kidding..

Actually I was given the data all zipped up and the mysql data bases were separate and they were the direct downloads as follows:
wp_comments.MYD
wp_comments.MYI
wp_comments.frm
all data was in this format.
I used SSH and uploaded it to the proper directory on the server and all is well at least as far as visitors seeing all the data.. but when I log into the site I get the following...

WordPress database error: [Table 'wp_options' is read only]
UPDATE wp_options SET option_value = 'O:9:"magpierss":18:{s:6:"parser";i:0;s:12:"current_item";a:0:{}s:5:"it ems";a:10:{i:0;a:12:{s:5:"title";s:13:"WordPress 2.2";s:4:"link";s:54:"http://wordpress.org/development/2007/05/wordpress-22/

I used SSH and tried to change the concerned files to writable and it works fine but the same error is generated.

I can go direct to the data base using myAdmin and cannot edit (write) to any table. It says the data base is read only.

On the same mysql area, I have another data base that was done via the normal way and I can write to it just fine.

I can find nothing to change to make the site writeable.

Any help here would be greatly appreciated..

SSH to the server and changing the files to writable has no effiect..

Mysql Master/Slave Read Write To Database Question
If I setup my database as master/slave and user enters data into the html form. This data is written to the master database. After html form submission user is directed to view.html to view the submitted data. The view.html page does the read from the slave. Would it be safe to assume that the data that user submitted would be written to master and immediately displayed in the view.html by reading slave data base?

MySql OUTFILE, ERROR 1 (HY000): Can't Create/write To File
I have problems in exporting tables to a file in MySql using OUTFILE option. MySql machine is a remote one. I got the error

ERROR 1 (HY000): Can't create/write to file '/tmp/scshekaran/bcp_table.txt' (Err 2)

Where Conditions
I am using MySQL phpmyadmin on my server. I would like some examples of different conditional codes to retrieve info from my tables.

LIKE Conditions
Basically I have a table, with a column which holds a list of related tags separated by spaces. The user can search for a row using a key word that will search this column (and the column named header too) and return if the keyword appears in the tags (or heading)... I tried to achieve this by using the following SQL but it actually returns every entry in the database... I have never used "LIKE" before so if someone could give me a slap and say I am doing something stupid that would be awesome .

SELECT * FROM VIDEOS WHERE VIDEO_HEADER LIKE '%$seachText%' OR VIDEO_TAGS LIKE '%$searchText%'

WHERE Conditions
I'm trying to optimize a search and I'm wondering if anybody knew whether the order of the conditions in the WHERE clause actually matters. Is it parsed from left to right? If so, then should I put the conditions likely to eliminate the most records first, followed by those that will eliminate the least?
Also - I need to join several tables for this search (1 master table that contains user info and about 7 secondary tables that include additional information on users) and I am trying to decide whether I should do the joins one at a time and eliminate users in a series of steps (to prevent getting an overly large table), or if I should evaluate and combine everything in a single statement. The problem is I don't really know what the parsing order of the SELECT statement is.

2 Of 5 Conditions Match
I need my query to match at least 2 of 5 given conditions.

Example:
I have conditions
content REGEXP 'A'
content REGEXP 'B'
content REGEXP 'C'
content REGEXP 'D'
content REGEXP 'E'

I need database to return this entry only if at least 2 conditons are true.

Search On Several Conditions
I want to retreive data from a table on several conditions in order; for example;

All i am trying to do is select all records on the following condition;

User_id = variable AND (Profile = "variable" OR Profile = "Both") ORDER by hits in DESC

I came up with this statement but no matter what i do i cannot get it to produce the result above

"SELECT * FROM links WHERE user_id='$user_id' AND (profile='$mycurrentprofile' OR profile='Both') GROUP BY total_hits DESC"

Can anyone offer me any help please, would really appreciate this as its doing my head in.

BTW, the following statement seems to work so not sure whats going on ? Only thing i can think is that its screwing up if total_hits above is equal 0 ?

"SELECT * FROM links WHERE folder_id='$activefolder' AND (profile='$mycurrentprofile' OR profile='Both') GROUP BY title ASC"

Sums For Two Different Conditions
I want to combine the following 2 queries into 1 query where it would give me 2 results (proflad and proftot) but don't know how

select sum(return-inv)as proflad
from allbets where com="lad"

select sum(return-inv)as proftot
from allbets where com="tot"

Transactions And Race Conditions
In an application I'm developing, I'm at a point where there needs to be tight integration of application-level logic sprinkled in between several consecutive SQL statements. This negates the option to use stored procedures since subsequent SQL statements depend on application logic that cannot be transferred into the database. I need the ability to rollback on errors (i.e. I need to use a transaction), but I also need to avoid race conditions.

Reading the MySQL documentation, START TRANSACTION will implicitly issue an UNLOCK TABLES statement; conversely, LOCK TABLES will implicitly COMMIT any active transaction. At this point it appears that I have to choose between transactions and locks, but I need the functionality of both.

Two Alike Conditions In Query?
Example. I have a table with information about payments (id, amount, pay_date, customer_id). Can I select two sums for two different date ranges, grouped by 'customer_id' (for each customer) in one query?

Left Join Conditions
Two tables.

table1, table2

Table 1 contains all unique items.
Table 2 contains x references to table 1, unique by customerId

I want to do a join onto table2 where table1.id = table2.table1Id AND table2.customerId = the user's ID

I can't quite figure out how to work in the idea of an AND into my left join. Unless both those conditions are two, I don't want any data from table2.

Only solution I can think of so far is to just left join on the id's, but select the customerId from table2, and as I loop through, check to see if it's supplied and the right id, and keep track of duplicate items from multiple customers myself.

Suggestions?

Conditions On Left Join
I'm having trouble constructing this left join query. I want to retrieve all rows from tProducts, and relevant matches from pictures, however what I have got just jams up the server and I have to restart. Am I doing it wrong?

SELECT prodCode, prodName
FROM tProducts LEFT JOIN pictures
ON productID = relProdId
AND prodCode = 'SF2'

Query Performance On Column Conditions
I have a question regarding MySQL performance on column conditions. How MySQL reacts where you add a condition to the same column?

For example:

SELECT * FROM users WHERE status<>4
and the same query with extended column check
SELECT * FROM users WHERE status<>4 AND status<>5 ...

I am specially interested in situation where the conditions checks a column value and whether the data is specified:

SELECT * FROM users WHERE status<>4 OR status IS NULL

What's with the MySQL's performance in such cases? Is the same column (status in the above example) checked twice or the optimizer takes care of it in some special way?

OUTER JOIN With Extra Conditions?
I need to get a list of products in a certain category, along with the quantity of each item already added to the shopping cart for a given session number. I'm having a heck of a time satisfying the latter condition.

shoppingCart table:
+--------+-----------+-----------+-----+
| cartID | sessionID | productID | qty |
+--------+-----------+-----------+-----+
product table:
+-----------+--------------+------+--------+
| ProductID | ProductCatID | name | Active |
+-----------+--------------+------+--------+
Here's my base query, which just gets all the products in a given category.

SELECT product.*
FROM product
WHERE `ProductCatID`='{$id}'
AND `Active`=Ƈ'
Here's the query I've got so far:

SELECT product.*, shoppingCart.qty
FROM product
LEFT OUTER JOIN shoppingCart ON shoppingCart.productID = product.ProductID
WHERE `ProductCatID` = Ɗ'
AND shoppingCart.sessionID = '{$sessionID}'
AND `Active` = Ƈ'
Obviously, this does NOT work, because it limits the query to ONLY products that have the specified sessionID. I need it to return ALL the products in the category, but give me the quanity for items in the shoppingCart table, ONLY IF the sessionID matches (otherwise it should return NULL)!

Combining UPDATE Statements With Different Fields And Conditions
I'm slightly paranoid that I haven't unearthed an existing answer to this question, but the ones I have been able to find didn't have two different variables requiring two different conditions. Basically, I want to know if it's possible to combine the following UPDATE statements into a single query:

UPDATE table SET field1 = field1 - n WHERE field 1 > x
UPDATE table SET field2 = field2 - n WHERE field 2 > x

.......

Granting User Access On Field With Restrictions Or Conditions
I am planning to develop a database that will have many users. Assume I have a table called Customer having these fields (id, name, user). Assume we have these Data:

ID Name User
1 Cust1 user1
2 Cust2 user1
3 Cust3 user1
4 Cust4 user2
5 Cust5 user2

I want the users to have access on those records that are created by them only or those that have their name on in the (User Field).

For example, if (user1) accessed the database and called: "SELECT * FROM customer;" it should return these data only automatically (or throw an exception at least):

Result:
1 Cust1 user1
2 Cust2 user1
3 Cust3 user1

(or throw an exception at least) that he cant call this statements without a where cluse like (USER=user1).

also, the user should have only the right to insert records having their name on in the (User) Field. For example: user1 can only call : "INSERT in CUSTOMER Values (6 , Cust6, user1), if he inserts user2 instead, the system should through an exception.

I hope I made clear examples of what I would like to build. How can I acheive this?

Help Me Write This Join?
Hi there, been ages since I wrote any sql, and I'm a little stuck but I figure this is easy for you folks. I have this original query:

$posts = $wpdb->get_results("SELECT ID, post_title FROM " . $wpdb->posts . " WHERE post_status='publish' ORDER BY post_date DESC");

And this gives a lists of all posts. However, I want to only grab posts by a certain category now, say category #9. This information is kept in an intersection table called wp_post2cat. The columns in that table are:

rel_id
post_id
category_id

category_id is what I want, and post_id is the key pointing back to the original post. Posts can have multiple categories, but I just want the one listing where it's category 9, which is audio.

So pseudocode would be something like:

SELECT all posts WHERE post_status equals "publish" and the category is equal to audio (9).

How To Write This Select?
I'm having some troubles writing a select. I have the following tables:

theater
-------
- id
- name

movie
-----
- id
- name

showtime
---------
- id
- theater
- movie
- from
- to
- schedule

I would like to list all the theaters with all the available showtimes and movies. I tried to, but i didn't get the result i was expecting. Can somebody help?

Best Way To Write This Query
Query 1: obtains results in boolean mode from products table based on keywords

Query 2: Would like to grab all manufacturers names from manufacturers table based on mf_id in products table to then create a brand filter.

What is the best way to do this in the most efficient query possible.

I was thinking of building a php array from query 1 of mf id's and the putting them in query 2 and separating them using OR operators.

any ideas?

here is the query fyi:

PHP

$sql =  "SELECT products_id as prodid,
                    products_name as name,
                    manufacturers_id as manufacturers_id,
                    products_price as price,
                    products_msrp as msrp,
                    products_date_added as pda,
                    products_status as status,
                    products_sku as sku,
                    products_weight as weight,
                    categories_id as cat_id,
"
        .boolean_sql_select(
            boolean_inclusive_atoms($search_string),
            $fulltext_key)." as relevance
"
        ."FROM $table_name
"
        ."WHERE
"
        .boolean_sql_where($search_string,$fulltext_key)."
"
        ."HAVING relevance>0
";



        if (isset($HTTP_GET_VARS['sort'])) {
            if ($_GET['sort']=="brand") {
            $sql.="ORDER BY products_name ";
            } elseif ($_GET['sort']=="size") {
            $sql.="ORDER BY products_weight ";
            } elseif ($_GET['sort']=="price_low") {
            $sql.="ORDER BY products_price ASC ";
            } elseif ($_GET['sort']=="price_high") {
            $sql.="ORDER BY products_price DESC ";
            } elseif ($_GET['sort']=="fav") {
            $sql.="ORDER BY products_name ";
            }

        } else {
            $sql.="ORDER BY relevance DESC
";
        }

How Do I Write This Trigger?
Iâ€™ve been searching all over for the answer to this one. If you have the answer, it would help me out a lot!

Using MySQL triggers, I want to sync content between two tables; I have table â€œuserâ€ and table â€œusersâ€, each have similar columns â€œlast_nameâ€ â€œfirst_nameâ€ â€œuser_idâ€ â€¦etc, and when a row gets written to table â€œusersâ€, I wanted that record to be replicated and inserted to â€œuserâ€ (with all the same field info).

How do I write this trigger? I know, itâ€™s anti-normalization, but it will really help me out with testing one of our site's authentication.

Can't Write To File
Using MySQL 4.1.11-max on OS X 10.3. Using command line.
Can't successfully use "INTO OUTFILE". Getting the following:
mysql> select *
-> into outfile '/users/steves/desktop/test.txt'
-> fields terminated by ','
-> from industry;
ERROR 1 (HY000): Can't create/write to file '/users/steves/desktop/test.txt' (Errcode: 13)
At the shell, I get this:
steves2ndmac:~ steves$ perror 13
OS error code 13: Permission denied

Newbie in both Unix shell and MySQL. Can anyone tell me how to set permissions for Unix User mysql?

Cant Write Or Delete
I cant get my php script to insert or delete records into a mysql
table. I can view them all fine but that's about it. I've checked
the user permissions on mysql and have set them all to 'Y' incase that
was the problem but still no joy. Can anyone suggest what the problem
may be? I'm tried the usual RTFM but cant spot the problem

Write Data To Row With Via C API
I have an app written in C that sends data to text files. The files receive 8 variables and look like this:

May 19 20:42:09 2002
7
Services
3.23
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Rather than writing data to a text file, I need that data to go to a MySQL 5.0.41 database row. I've already got the C API working and connecting to the "localhost" database, but now I need to write data with each transaction. Optimally, I'd like to send the data directly to the database row, but there doesn't seem to be an INSERT statement to do that. What's the best method to write the data to the database directly?

How To Write Like Comparison In Procedures?
this sample procedure takes in an username, searches for number of entries matching the pattern of the username.

delimiter $$
create procedure sampleDB.sampleProcedure( IN m_username varchar(30), OUT m_username_matched_count int )
deterministic
begin
if length(m_username) = 0 then
set m_username = 'jason' #set temporary name if empty
end if

set m_username_matched = 0; #finds number of matches for the given username

select
count(*) into m_username_matched #store into the variable to be returned
from
sampleDB.sampleTable
where
userName like '%m_username%' #this is the statement that does not work#

end$$

How Do I Write Multiple Conditions In An MySQL IF Statement?

I am using version 3.23 and want to write something like this: