$sql = "select gjd_callback.call_fee, gjd_callback.call_time from gjd_callball,gjd_cs where gjd_cs.id=gjd_callback.call_id and gjd_cs.id=$id"
还可以：
$sql = "select gjd_callback.call_fee, gjd_callback.call_time from
gjd_callball
left join gjd_cs on
gjd_cs.id=gjd_callback.call_id
where
gjd_cs.id=$id"
这两句都可以！
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