答案 0 :(得分:0)
您可以连接日期和时间列以获取datetime列,按顺序排序并使用LIMIT选择前1行,例如:
SELECT A.bank_name,
B.comp_name,
C.b_num,
C.balance_now ,
C.relation_id
FROM balance C
LEFT JOIN relation D
ON C.relation_id=D.s_no
LEFT JOIN bank A
ON A.bank_id=D.bank_id
LEFT JOIN company B
ON B.comp_id=D.comp_id
GROUP BY C.relation_id
ORDER BY concat(C.date,' ',C.time) DESC
LIMIT 1