Mysql 同时整合其他运营商。大约有16000个共点。其中，联邦快递服务于约19000个地点。他们中的一些只有交付。需要关于计划A的建议。与其保留所有可能的组合，不如保留范围组合？例如，考虑PIN码67630367638767642和6953826953816956

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同时整合其他运营商。大约有16000个共点。其中，联邦快递服务于约19000个地点。他们中的一些只有交付。需要关于计划A的建议。与其保留所有可能的组合，不如保留范围组合？例如，考虑PIN码67630367638767642和695382695381695650。对于pincode 676303，有6种可能的组合。但如果取pincode的前三个数字，即676-676和676-695，则只有两个组合，并且只有这两个组合的保持率。问题是，在之间查找

，无法很好地优化。
    Shipping Companies
    --------
    ID (int, PK)
    Name (string)

    Pincodes
    --------
    ID (int, PK)
    Pincode (string)

    These entities have a many-to-many relationship.  So create a table to link them:

    Shipping Company Pincodes
    --------
    ID (int, PK)
    Shipping Company ID (int, FK)
    Pincode ID (int, FK)
    Pickup (bit)
    Delivery (bit)

Pincode   |  Fedex Rate   |   DHL Rate  |  UPS Rate
----------------------------------------------------
67 - 69        7.7              6.5          5.5 

Shipping Companies
--------
ID (int, PK)
Name (string)

Shipping Company Pincodes 
--------
Shipping Company ID (int, PK/FK)
Pincode (int, PK/FK)
Pickup (bit)
Delivery (bit)
Rate (decimal)

CREATE TABLE Rates (
    from_a, from_z,   -- min and max pins for source pin range
    to_a, to_z,       -- ditto for destination
    fedex DECIMAL(6,2) NULL   -- NULLable in case fedex does not run that route
    etc.
    PRIMARY KEY(from_a, from_z, to_a, to_z)
) ENGINE=InnoDB;

SELECT  IFNULL(fedex, 'N/A')  AS Fedex, ...
    FROM Rates
    WHERE $from BETWEEN from_a AND from_z
      AND $to   BETWEEN to_a   AND to_z;

PRIMARY KEY(x, y, from_a, from_z, to_a, to_z)

SELECT ...
    FROM Rates
    WHERE x = FLOOR($from/100)
      AND y = FLOOR($to/100)
      AND the rest of Plan B's WHERE