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I have imported a csv file in QGIS. The file contains 1 column with 43000 rows of data. I want to apply a filter to visualise data only every 10 rows in order to make more clear the graphics.

Please can you suggest me which type of filter I can use ?

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Assuming you don't have a unique id field, you can use rule based symbols with the following filter

$id % 10  = 1

The % sign is equivalent to remainder, so any row that divides by 10 with a remainder, i.e, every 10th row will remain while the others will be filtered out of the result.

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