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  • summing two colums total in mysql

    - by JPro
    I want a resultset for this table : ID Number_of_posts Number_of_user 1 100 21 2 23 34 as ID Number_of_posts Number_of_user Number_of_posts_AND_Number_of_user 1 100 21 178 2 23 34 178 ----------------------------------------------- 123 55 Is it possible to get the sum of two colums as another column/ as output in mysql?

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  • MySQL - Update the same column twice

    - by uzioriluzan
    Hello, I need to update a column in a mysql table. If I do it in two steps as below, is the column "col" updated twice in the disk ? update table SET col=3*col, col=col+2; or is it written only once as in : update table SET col=3*col+2; Thanks

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  • Sort MySQL result set using comparison between 2 columns of same value type

    - by Kyobul
    Hello, I have a table containing last_updated_1 and last_updated_2 columns, used respectively for text and images update time on a post. I wish I could get a result set of 10 rows based on all time last updated records contained in the 2 columns, ex. row 1 = last_updated_1 record, row 2 = last_updated_2 record, row 3 = last_updated_1 record, etc. How could I compare inside a MySQL query the both columns values, to get unique & mixed result set ? Thank you in advance for your help

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  • Checking if mysql user exists

    - by sergiogx
    How can I check if a user exists? Im doing an installer for a mysql database, and I need to check if a user exits, if not create user, if yes delete user and create it again. this so i can execute the script without worries. thanks.

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  • MySQL: how to index an "OR" clause

    - by JoséMi
    I'm executing the following query SELECT COUNT(*) FROM table WHERE field1='value' AND (field2 = 1000 OR field3 = 2000) There is one index over field1 and another composited over field2&field3. I see MySQL always selects the field1 index and then makes a join using the other two fields which is quite bad because it needs to join 146.000 rows. Suggestions on how to improve this? Thanks

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  • migrate a portion of a mysql table to SQLite

    - by daniel
    I have a mysql table set up like so: user_id | document 44 [blob] 44 [blob] 44 [blob] 46 [blob] I'd like to export all of user_id 44's data to an SQLite3 file. Best way to go about this without writing a script that reads the data and dumps it into a SQLite file?

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  • query mysql table and fetch rows posted in 3 days

    - by Mac Taylor
    Hey guys how can i query my mysql database and fetch rows which are posted in earlier 3 days i know how to fetch todays's rows but not 3 days ago time will save in my table like this : 2010-01-20 19:17:49 and this is what i know : SELECT id FROM pages WHERE date=now() but i need to show posts in 3days and im looking for a simple and straight solution ,because i know how to do so in long php codes

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  • Mysql Windows "mysqldump -t" restore

    - by Glide
    Yes it's Windows sorry. I'm using mysqldump with the option -T which creates a sql and a txt file per table. mysqldump -u user -ppass db -T path I use that option to be able to restore easily one table. Now I'd like to restore all the tables. mysql -u user -ppass db < path/*.sql Obvously doesn't work Also, I don't know where do my funcs/procs go. Thx

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  • PHP & MySQL query value question.

    - by space
    How can I use the first query's id value $row['id'] again after I run a second query inside the while loop statement? To show you what I mean here is a sample code below of what I'm trying to do. I hope I explained it right. Here is the code. $mysqli = mysqli_connect("localhost", "root", "", "sitename"); $dbc = mysqli_query($mysqli,"SELECT users.* FROM users WHERE user_id = 4"); if (!$dbc) { // There was an error...do something about it here... print mysqli_error($mysqli); } while($row = mysqli_fetch_assoc($dbc)) { echo '<div>User: ' . $row['id'] . '</div>'; echo '<div>Link To User' . $row['id'] . '</div>'; $mysqli = mysqli_connect("localhost", "root", "", "sitename"); $dbc2 = mysqli_query($mysqli,"SELECT COUNT(cid) as num FROM comments WHERE comments_id = $row[id]"); if (!$dbc2) { // There was an error...do something about it here... print mysqli_error($mysqli); } else { while($row = mysqli_fetch_array($dbc2)){ $num = $row['num']; } } echo '<div>User ' . $row['id'] . ' Comments# ' . $num . '</div>'; }

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  • Mysql Trigger to select and delete

    - by Karthick
    Hi, Is this possible, can a trigger in mysql can do a select first and then based on its result do a delete?, both on the same table. Am struggling to get it right. There are duplicate entries in a table, i need to have a trigger which selects and then deletes. Any ideas or thoughts will be really helpful.

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  • MySQL: SUM in WHERE clause

    - by checcco
    Hi guys, I've got this table CREATE TABLE `subevents` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(150) DEFAULT NULL, `content` text, `class` tinyint(4) NOT NULL DEFAULT '1', PRIMARY KEY (`id`) ) ENGINE=MyISAM Each row can have a different value in the 'class' field. I'd like to select any number of rows, ordered randomly, as long as the sum of the values in the 'class' field is equal to 100. How could I accomplish it directly in the MySQL query without doing it later in PHP? Thanks everybody!

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  • MySQL - What is the correct primary key method

    - by Hammerstein
    I'm starting to develop an application using MySQL and although I've developed apps before using databases, I've normally gone to the incrementing id method. The other day I was reading a posting somewhere and saw someone being picked apart for this, for not properly "normalising the database". I'm not a big database person, but I wanted to make sure I'm doing this right. Any ideas, help / guidance?

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  • MySQL One to Many order by number found in joined table

    - by Finbarr
    Two tables: table_a ------- table_a_id: (primary, int) table_b ------- table_a_id: (index, int, from table_a) table_b_value: (varchar) A one to many relationship between table_a_id and table_b_value. Given a query like this: SELECT DISTINCT(table_a_id) FROM table_a JOIN table_b ON table_a.table_a_id=table_b.table_a_id I want to order by the number of occurrences of table_a_id in table_b. I'm not really sure how to write this in MySQL.

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  • Get insert statement query

    - by Karthick
    Hi, Is there a way to get the insert statements for a table via some query in MySql? for ex: if the table name is Cards,which has 5 rows, i need to get the insert statements for that particular table. Thanks.

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