How to do a MySQL recursive query?
Let’s learn how to do a MySQL recursive query. The most accurate or helpful solution is served by Stack Overflow.
There are ten answers to this question.
Best solution
WITH RECURSIVE transitive_closure(a, b, distance, path_string) AS ( SELECT a, b, 1 AS distance, a || '.' || b || '.' AS path_string, b AS direct_connection FROM edges2 WHERE a = 1 -- set the starting node UNION ALL SELECT tc.a, e.b, tc.distance + 1, tc.path_string || e.b || '.' AS path_string, tc.direct_connection FROM edges2 AS e JOIN transitive_closure AS tc ON e.a = tc.b WHERE tc.path_string NOT LIKE '%' || e.b || '.%' AND tc.distance < 3 ) SELECT * FROM transitive_closure --WHERE b=3 -...
Answer:
The WITH RECURSIVE statement/method is applicable in PostgreSQL and Sybase (and maybe a few more, I...
Maulik patel at Stack Overflow Mark as irrelevant Undo
Other solutions
$k = $_GET ['k']; $terms = explode(" ", $k); $query = "SELECT * FROM mattsdbone WHERE "; foreach ($terms as $each){ $i++; if ($i == 1) $query .= "category_name LIKE '%$each%' "; else $query .= "OR category_name LIKE...
Answer:
Add error_reporting(E_ALL), as the first line of your php file, just after the <?php That will show...
Joe at Yahoo! Answers Mark as irrelevant Undo
I want to be able to pass any query to MySQL, have MySQL check whether the query's syntax is valid, including whether non-existing tables or columns have been referenced, and return an error if something is wrong, WITHOUT actually executing the query...
Answer:
Hi, I've been working with MySQL for almost 10 years, and never heard of such a setting. I checked...
vladkornea-ga at Google Answers Mark as irrelevant Undo
I have 2 tables, one named ARTICLE and one named COMMENTS. Say ARTICLE table contains … -ID - article And COMMENT table contains… -ID -article_id (which will be related to “ ID” in the articles table) -comment I have a simple...
Answer:
SELECT a.id AS "Article ID", COUNT(*) AS "Number of Comments" FROM article a JOIN...
TheMadPr... at Yahoo! Answers Mark as irrelevant Undo
I have the following line in my plugin to remove transients from the database option table. $wpdb->query( "DELETE FROM `wp_options` WHERE `option_name` LIKE ('_transient%_feed_%')" ); However, it won't work with sites which set a prefix...
Answer:
Use the global wordpress variable $table_prefix in your query: $wpdb->query( "DELETE FROM ...
Nicholas Pickering at Quora Mark as irrelevant Undo
I am using MySQL database. When I execute a query which the main table(20 thousands of rows) is joined with the other 5 tables, it takes 90 seconds to return me the result. I then added indices into each of the criteria(where clause). Then the execution...
Answer:
Optimizing MySQL queries is a fairly straightforward process. To solve your problem would require a...
Juan Cristián Vera Huneeus at Quora Mark as irrelevant Undo
I already know how to join two tables or even three, but my situation is a little different....I have a table of mobile homes for sale....I have a second table of the parks those homes are in. I have a third table of bank repossesions that exist in mobile...
Answer:
Hi, Here I am assuming that table PARK with mobile homes is related to table MOBILEHOME. So I have joined...
BA at Yahoo! Answers Mark as irrelevant Undo
INSERT INTO Vendor (VName, VPhone, VLoc) VALUES ('Mike Douglas', '260-555-5555', 'Denver, CO)"; The Vendor table also has a field for CarID. There is a Car Table that has the following row: CarID: 89 | Make: Pontiac | Model: GrandAm | Miles: 87...
Chris S at Yahoo! Answers Mark as irrelevant Undo
As of now I have a single DB setup (both reads and writes are done on this). Now I have an hourly cron which do heavy reads and writes on this and then I have users using the system. I will like to make sure that user queries are given precedence by...
Answer:
Another possible solution: Setup Master to Master replication, direct cron to 1 master and users to...
Manoj Murumkar at Quora Mark as irrelevant Undo
(Windows 7 64-bit Ultimate, MySQL Workbench 5.2.47 CE) The following figure shows 6.5 sec instead of the usual ~600 seconds as it was fastest to illustrate:
Answer:
http://bugs.mysql.com/bug.php?id...: Go to Preferences -> SQL Editor and set to a bigger value this...
Franck Dernoncourt at Quora Mark as irrelevant Undo
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