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05.08.2008 at 08:08AM PDT, ID: 23386348
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9.3

UNION or JOIN with sub queries

Asked by josh2780 in MySQL Server

Tags:

I have hierarchical data stored in a table and I'm trying to write a query that will return the full path to an item in one result.  For example, assume the following table and data:

CREATE TABLE treedata (id int,title varchar(25),lft int,rgt int,primary key (id));
INSERT INTO treedata VALUES (1,'Food',1,14);
INSERT INTO treedata VALUES (2,'Fruit',2,9);
INSERT INTO treedata VALUES (3,'Red',3,6);
INSERT INTO treedata VALUES (4,'Cherry',4,5);
INSERT INTO treedata VALUES (5,'Yellow',7,8);
INSERT INTO treedata VALUES (6,'Meat',10,13);
INSERT INTO treedata VALUES (7,'Beef',11,12);

For 'Cherry', the result of my query should return 'Food,Fruit,Red,Cherry'.  I can accomplish this with the following query:
SELECT GROUP_CONCAT(td.title) as fullName FROM (SELECT title FROM treedata WHERE lft <= 4 and rgt >= 5 ORDER BY lft ASC) td;

What I'd like to do is modify this query to return all of the results in the tree (without having to supply a lft and rgt value as I did in the query above).  For instance, the modified query would return a result set similar to:
Food
Food,Fruit
Food,Fruit,Red
Food,Fruit,Red,Cherry
Food,Fruit,Yellow
... and so on ...

I've tried with various JOINs and UNIONs but have been unsuccessful.  Thanks for your help.Start Free Trial
 
Keywords: UNION or JOIN with sub queries
Title
1 Problem with UNION query
2 Looking for food database
3 It is all about MEAT!
4 Three Food Groups
5 Genetically Modified food
6 Camping food
 
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[+][-]05.08.2008 at 08:27AM PDT, ID: 21525551

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About this solution

Zone: MySQL Server
Tags: mysql
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Solution Provided By: Thomasian
Participating Experts: 1
Solution Grade: A
 
 
 
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