Mysql 清楚那些新问题了吗？谢谢你，比尔，你的深入澄清。我需要再检查几次，但它确实为我清理了一些东西：）。 CREATE TABLE `ipcountry` ( `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,

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清楚那些新问题了吗？谢谢你，比尔，你的深入澄清。我需要再检查几次，但它确实为我清理了一些东西：）。

CREATE TABLE `ipcountry` (
    `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
    `ipFROM` INT(10) UNSIGNED ZEROFILL NOT NULL DEFAULT '0000000000',
    `ipTO` INT(10) UNSIGNED ZEROFILL NOT NULL DEFAULT '0000000000',
    `countrySHORT` CHAR(2) NOT NULL DEFAULT '' COLLATE 'utf8_czech_ci',
    `countryLONG` VARCHAR(255) NOT NULL DEFAULT ' ' COLLATE 'utf8_czech_ci',
    PRIMARY KEY (`id`),
    INDEX `ipINDEX` (`ipTO`, `ipFROM`)
)
COLLATE='utf8_czech_ci'
ENGINE=InnoDB
AUTO_INCREMENT=2490331
;


CREATE TABLE `ipcountry2` (
    `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
    `ipFROM` INT(10) UNSIGNED ZEROFILL NOT NULL DEFAULT '0000000000',
    `ipTO` INT(10) UNSIGNED ZEROFILL NOT NULL DEFAULT '0000000000',
    `countrySHORT` CHAR(2) NOT NULL DEFAULT '' COLLATE 'utf8_czech_ci',
    `countryLONG` VARCHAR(255) NOT NULL DEFAULT ' ' COLLATE 'utf8_czech_ci',
    PRIMARY KEY (`id`),
    INDEX `ipINDEX` (`ipFROM`, `ipTO`)
)
COLLATE='utf8_czech_ci'
ENGINE=InnoDB
AUTO_INCREMENT=2490331
;

{
    "table": "UnknownTable",
    "rows":
    [
        {
            "id": 1,
            "select_type": "SIMPLE",
            "table": "ipcountry",
            "partitions": null,
            "type": "range",
            "possible_keys": "ipINDEX",
            "key": "ipINDEX",
            "key_len": "4",
            "ref": null,
            "rows": 83260,
            "filtered": 33.33,
            "Extra": "Using index condition"
        }
    ]
}

{
    "table": "UnknownTable",
    "rows":
    [
        {
            "id": 1,
            "select_type": "SIMPLE",
            "table": "ipcountry2",
            "partitions": null,
            "type": "ALL",
            "possible_keys": "ipINDEX",
            "key": null,
            "key_len": null,
            "ref": null,
            "rows": 2515343,
            "filtered": 16.66,
            "Extra": "Using where"
        }
    ]
}

SELECT * FROM `ipcountry2` force index (`ipINDEX`)
WHERE ipFROM<=3548978221 AND ipTO>=3548978221 

        "key_len": "4",

        "rows": 83260,

        "Extra": "Using index condition"