How to avoid a cartesian product in an INNER JOIN query?

Question

I have 6 tables, let's call them a, b, c, d, e, f. Now I want to search all the columns (except the ID columns) of all tables for a specific word, let it say "Joe". I did this, I did INNER JOINS across all tables, and then used LIKE to search for columns.

INNER JOIN
...
ON
INNER JOIN
...
ON.......etc.
WHERE a.firstname 
~* 'Joe' 
OR a.lastname 
~* 'Joe' 
OR b.favorite_food 
~* 'Joe'
OR c.job
~* 'Joe'.......etc.

The results are correct, I get all the columns I need. But I also have some kind of Cartesian product, I get two or more rows with almost the same results.

How can i avoid this? I want each row to be only once, as the results should appear in a web search.

UPDATE

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Answer 1

SELECT DISTINCT?

Answer 2

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Answer 3

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SELECT a.*, b.*
FROM (SELECT DISTINCT a.ID
      FROM ...
      INNER JOIN ...
      INNER JOIN ...
      WHERE ...) x
INNER JOIN a ON x.ID = a.ID
INNER JOIN b ON x.ID = b.ID

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Answer 5

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EntityType, EntityID, Keywords
------------------------------
Person,     4,        'Joe', 'Doe'
Company,    12,       'Joe' Gym', 'Gym'

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