PHP MySQL consolidate column where other column has duplicates


I have a MySQL table that has three columns, the first is a unique key (INT(11) AUTO_INCREMENT), the next is an indexed value (VARCHAR(255)) and the third is a description (TEXT). There are duplicate values in the second column, but each row has a different description. I want to remove all rows where the second column is duplicated but append each description of the same indexed value to the first instance the value, and breaking string with a semicolon and space.

For example, my table looks like this:

cid | word | description ------------------------------ 1 | cat | an animal with wiskers 2 | cat | a house pet 3 | dog | a member of the canine family 4 | cat | a cool person

I want to change the table to look like this:

cid | word | description ------------------------------ 1 | cat | an animal with wiskers; a house pet; a cool person 3 | dog | a member of the canine family

I'm not adverse to using a PHP script to do this, but would prefer MySQL. The table has over 170,000 rows and would take PHP a long time to loop over it.



select `cid`,`word`,group_concat(`description` SEPARATOR '; ') as `description` from `test_table` group by `word`;

Ok.. you can copy all the data into another table, and rename it then..

insert into `test_new` (`cid`,`word`,`desc`) (select `cid`,`word`,group_concat(`desc` SEPARATOR '; ') as `description` from `test_table` group by `word`); mysql> describe `test_new`; +-------+----------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+----------+------+-----+---------+-------+ | id | int(11) | YES | | NULL | | | word | char(10) | YES | | NULL | | | desc | text | YES | | NULL | | +-------+----------+------+-----+---------+-------+ 3 rows in set (0.00 sec) mysql> select * from `test_new`; +------+------+---------------------+ | id | word | desc | +------+------+---------------------+ | 1 | cat | desc1; desc2; desc4 | | 3 | dog | desc3 | +------+------+---------------------+ 2 rows in set (0.00 sec)


As was mentioned before, you can create a new table and copy the info, you can also do it in two steps, but only if there´s no problem with modifying the old table:

UPDATE tableOld AS N1, tableOld AS N2 SET N1.description = concat(concat(N1.description,"; "),N2.decription)) WHERE N2.word = N1.word insert into tableNew (cid,name,description)select * from tableOld group by word


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