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                            ### 清空表
		TRUNCATE TABLE `users`；
        
### 插入一個字段
		ALTER TABLE `evidences` ADD `worker_id` VARCHAR(50) NOT NULL COMMENT '提取人' AFTER `worker`;
        在表`evidences` 中，在現有字段 `worker`之后，插入一個新的字段 `worker_id`， VARCHAR(50) 類型，NOT NULL，注釋為'提取人'
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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