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Re: Need help with advanced Joins
Posted by: laptop alias
Date: November 02, 2009 05:10AM

Sorry, I can't replicate that result:

DROP TABLE IF EXISTS eav;

CREATE TABLE eav(id INT NOT NULL,userid INT,title VARCHAR(30),data VARCHAR(30));

INSERT INTO eav VALUES 
(1,231,'name','John'),
(2,231,'age','24'),
(3,231,'gender','man'),
(4,232,'name','Pete'),
(5,232,'age','34'),
(6,232,'gender','man');

SELECT userid
     , MAX(CASE WHEN title = 'name' THEN data END)name 
     , MAX(CASE WHEN title = 'age' THEN data END)age 
     , MAX(CASE WHEN title = 'gender' THEN data END)gender 
  FROM eav GROUP BY userid;
  
+--------+------+------+--------+
| userid | name | age  | gender |
+--------+------+------+--------+
|    231 | John | 24   | man    |
|    232 | Pete | 34   | man    |
+--------+------+------+--------+

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Re: Need help with advanced Joins
November 02, 2009 05:10AM


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