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SELECT

        S.carOwnerID ,
        S.name,
        S.mobile,
        S.coopName,
        S.VIN,
        s.policyNO,
        S.effectiveDate,
        S.expiryDate,
        s.plateNo,
        (
            CASE
            WHEN s.num > 1 THEN
                1
            WHEN s.num = 1 THEN
                0
            END
        ) AS carState
    FROM
        (
            SELECT
                c.carOwnerID,
                c.name,
                c.mobile,
                c.coopName,
                c.VIN,
                p.policyNO,
                p.effectiveDate,
                p.expiryDate,
                c.plateNo,
                count(p.PlateNo) AS num
            FROM
                customer C
            LEFT JOIN policy P ON C.carOwnerID = P.carOwnerID
            WHERE
                date_add(
                    P.createTime,
                    INTERVAL 11.5 HOUR
                ) > NOW()
    
    ) s
    WHERE
        s.num > 0;

It is possible to simply use multi-table association. If you encounter high concurrency, performance defects will appear immediately