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-- 会议计划表：修改会议计划开始时间、会议计划结束时间字段
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ALTER TABLE hzims_conference_plan
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MODIFY COLUMN scheduled_start_time datetime NOT NULL COMMENT '会议计划开始时间',
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MODIFY COLUMN scheduled_end_time datetime NOT NULL COMMENT '会议计划结束时间';
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-- 演练计划表：修改演练计划开始时间、演练计划结束时间字段
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ALTER TABLE hzims_rehearsal_plan
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MODIFY COLUMN scheduled_start_time datetime NOT NULL COMMENT '演练计划开始时间',
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MODIFY COLUMN scheduled_end_time datetime NOT NULL COMMENT '演练计划结束时间';
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-- 特种设备表：添加单位字段
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ALTER TABLE hzims_device
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ADD COLUMN unit varchar(50) NOT NULL COMMENT '单位';
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