Updated 2023-09-01
    with tb1 as (select
    distinct BUYER_ADDRESS as sender,
    count(tx_hash) as no_transaction
    from ethereum.core.ez_nft_sales
    where NFT_ADDRESS='0x790b2cf29ed4f310bf7641f013c65d4560d28371'
    and price_usd>0
    group by 1)

    select
    case
    when no_transaction=1 then 'One time purchaser'
    when no_transaction>1 and no_transaction <5 then '1-5 times purchaser'
    when no_transaction>5 then 'More than 5 times purchaser'
    end as gp,
    count(distinct sender)
    from tb1
    group by 1 having gp is not null
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