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Asked: 2026-05-23T08:47:10+00:00

I have a table with the columns word, length, position, count and definition .

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I have a table with the columns word, length, position, count and definition.
I want to make a select of word and definition but just keeping the definition of some words (based on a condition over position, count and length) and the rest of definitions replace them by an empty string.

I’m doing the following query:

SELECT word,definition FROM (SELECT word, definition, position, count FROM words 
WHERE position = 5000 AND count < 5 AND length <= 6
AND definition IS NOT NULL
UNION ALL
SELECT word, "" AS definition, position, count FROM words)
ORDER BY position ASC, count DESC

But I end up with duplicated values in the column word.
How can I get this without duplicated values?

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1 Answer

  1. Editorial Team

    Add the inverse WHERE clause to your second set?

    SELECT word,definition FROM
(
  SELECT word, definition, position, count FROM words 
  WHERE position = 5000 AND count < 5 AND length <= 6
  AND definition IS NOT NULL
UNION ALL
  SELECT word, "" AS definition, position, count FROM words
  WHERE NOT (position = 5000 AND count < 5 AND length <= 6
             AND definition IS NOT NULL)
)
ORDER BY position ASC, count DESC
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