To select every value of tax_id only once, use 
SELECT DISTINCT tax_id FROM gene2acc WHERE genomic_ac_ver = ?

[download]
or 
SELECT tax_id FROM gene2acc WHERE genomic_ac_ver = ? GROUP BY tax_id

[download]

In reply to Re: dbi retieve single col value by pjotrik
in thread dbi retieve single col value by Anonymous Monk

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