Query mysql - results unexpected

Question

SELECT results.data_scrap AS data_badania, 
    tests.data_test AS data_badania2, 
    results.words_count_out_a AS liczba_slow, 
    results.position AS pozycja 
FROM results, 
    tests, 
    keywords 
WHERE results.keyword=test 
AND tests.id=1 
ORDER BY results.position 

我得到了這個查詢，我不知道爲什麼，但是在我的結果中，一行重複了好幾次。

SELECT * 
FROM results, 
    tests, 
    keywords 
WHERE results.keyword=test 
AND tests.id=1 
ORDER BY results.position 

結果是1.1.1.1.1.2.2.2.2.2.3.3.3.3.3而不是1.2.3。

Answer 1

試試這個：

SELECT DISTINCT * 
FROM results, 
    tests, 
    keywords 
WHERE results.keyword=test 
AND tests.id=1 
ORDER BY results.position 

另外，試試這個：

SELECT * 
FROM results, 
    tests, 
    keywords 
WHERE results.keyword=test 
AND tests.id=1 
GROUP BY results.position