ORACLE查詢條件查詢所有數據，並根據查詢條件返回不同USERNAME,nvl2用法

select tu.*, tb.id, tb.biddername, nvl2(tu.username, tu.enterprisename, tb.biddername) as username, tb.price, to_char(tb.pricedate, ‘yyyy-mm-dd hh24:mi:ss’) pricedate from trans_bidder tb left join tr

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