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Select DISTINCT on a particular field

I want to return distinct values based on a particular column – ‘company_code’. How do I achieve this? My code is as below.

$query = Drupal::database()->select('actuarial_bases', 'bases')                     ->fields('bases', ['company_code','basis_id','mortality','commission','initial_expenses','recurring_expenses','date_saved','discount_rate'])                     ->condition('approved_by',!"")                     ->orderBy('date_saved', 'DESC')                     ->distinct();
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Select DISTINCT on a particular field

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