On reading the documentation of the MySQL join commands, it looks like all the joins are analogous to , by simply finding the Cartesian product and then selecting from that result. Is this an accurate assumption? Should I instead write my own sub-queries and select from those? ...
0 down vote favorite I have to design GUI for authentication. Which will have 1. User name 2. Password using The stream socket, The packet socket or The raw packet.is it possible in php and mysql language. any references or tutorials? ...
Hi All, i am trying to create a query where there is a count of related records from another table. I'd like the "parent" records whether there are related records (a count) or not. SELECT r.region_name, r.region_id, r.abbreviation, r.map_order, (IFNULL( COUNT( p.property_id ) , 0 )) AS propertyCount FROM `rmp_region` r LEFT OUTER ...
Here is an example table: ID time data type 0 0100 xyz 0 1 0200 xyz 1 2 0300 xyz 1 3 0400 xyz 2 4 0200 xyz 0 5 0500 xyz 2 6 0300 xyz 0 Data is added based on timestamp so that the last of each type has the latest time stamp. I would like the result of a SELECT to b...
The table looks like this: CREATE TABLE `tweet_tweet` ( `id` int(11) NOT NULL AUTO_INCREMENT, `text` varchar(256) NOT NULL, `created_at` datetime NOT NULL, `created_date` date NOT NULL, ... `positive_sentiment` decimal(5,2) DEFAULT NULL, `negative_sentiment` decimal(5,2) DEFAULT NULL, `entit...
I'm trying to build a query with a variable limit. As far as I know I cannot do something like select * from table limit my_variable;, but I've read on the internet about a workaround: SET SQL_SELECT_LIMIT = variable; I have to write this syntax before the query I want to apply the LIMIT in. This works fine if I write a SELECT query a...
I'm working on a website where members can post their own adsense banners onto the site. Initially I wanted to use the Adsense API to share revenues with users. (They would just have to enter their Adsense publisher ID) but I found out that I don't meet the requirements to use the API. My alternative is to allow users to submit their en...
Hi, i have a small problem where i have this setup... Table: trade names { trade_id : 1 trade_name : olivers guest house} Table Customer { name: me, trade_id: 1 : blah: blah} i do a left join to get the trade name into customers as if you are a guest house you will have a trade name but as a landlord you will not have a tr...
I have a query (source)... UPDATE covers t LEFT OUTER JOIN (SELECT cover_id FROM covers ORDER BY cover_views DESC LIMIT 10) c ON c.cover_id = t.cover_id SET cover_views = 0 WHERE c.cover_id IS NULL ...which resets all but the top 10 covers in the database to 0. I want to extend this to reset all covers bar the top ten per c...
Hello, I have a script to find the lowest value from a column but some entries dont have a value or its set to 0 if this is the case I'd like ti to find the next lowest value. Here is my sql command. $result = mysql_query("SELECT DISTINCT product_name, format, image_url, MIN(online_price), EAN FROM products where $searchstring and form...
Hey all, I'm trying to import fixed with text files into a Mysql table. I'm digging around for answers, but my main issue is that I can't figure out the logic of how I should do this. Maybe someone could offer some hints on process: Steps 1. fopen the file $file_handle = fopen("thefile.txt", "r"); 2. Use feof to go to the end o...
Let's say I have the following tables: TAGS id: integer name: string POSTS id: integer body: text TAGGINGS id: integer tag_id: integer post_id: integer How would I go about writing a query that select all posts that are tagged with ALL of the following tags (name attribute of tags table): "Cheese", "Wine", "Paris", "Frace", "City"...
Let's say I have the following tables: TAGS id: integer name: string POSTS id: integer body: text TAGGINGS id: integer tag_id: integer post_id: integer How would I go about writing a query that selects all posts in order of the post containing the highest number of the following tags (name attribute of tags table): "Cheese", "Wine...
I am storing in a column a list of states that are separated by commas: Like this: 1,2,3,4,5,6,7,8.. and so on, just their IDs. Then I am doing a query to get all the rows that have the state with the ID 8, and it works when the list of states has few items. This is the query and the table: mysql> select id_partner, name, states from...
Hi, after a system failure, I have only limited access to the server. Question is, where does msyql store the database(s) and is it enough to just copy the files, or is anything else needed? I think I already spotted the databases @ /var/lib/mysql ... is it enough to backup these files & re-use them with a newly created database? ...
Hello, I'm a beginner. I'm learning by mostly reading the documentation. Unfortunately, http://dev.mysql.com/doc/refman/5.1/en/set-transaction.html#isolevel_read-committed doesn't say anything, while it says everything. Confused? Me too. ndb engine supports only "READ_COMMITTED" transaction isolation level. A. It starts by saying "set...
Is there any way to name the complete select as a table? I will try to explain what I am trying to do. I have this SELECT * FROM `Databse1`.`table1` JOIN `Database2`.`table2` ON `table2`.`customerID` = `table1`.`customerID` WHERE `table1`.`recordID` IN (1,2,3,4) I have another table, table3 that...
Hi, I am trying to create a good little search statement that searches muitple fields using the with different search terms depending on what is returned. I am basiclly setting an order in which I want to search if one search term is not found try the next one. However I am using a WHERE clause to seperate search only one type of data....
I'm getting an index scan on a join with a unique column; it claims to be examining a large number of rows even when it's looking up just one row. This is the query: select t.id, t.twitter_id, t.screen_name, t.text from tweets t inner join twitter_handle th on th.handle = t.screen_na...
All I keep on finding are source files for compiling the project myself (which keeps on failing). Any ideas please? Thank You! ...