ALTER TABLE `device_ledger`
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ADD COLUMN `is_iot_device` tinyint DEFAULT 0 COMMENT '是否为物联设备:0-否,1-是' AFTER `type`,
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ADD COLUMN `external_code` varchar(255) DEFAULT NULL COMMENT '外部编码' AFTER `is_iot_device`;
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CREATE INDEX `idx_device_ledger_iot_external_code`
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ON `device_ledger` (`is_iot_device`, `external_code`);
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