使用sql语句同步源表和目标表的指定地段
INSERT INTO yl_customer_info(customer_name,customer_level,customer_type)
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SELECT customer_name,customer_level,customer_type
FROM yl_customer_info_copy?
使用IGNORE关键字，如果遇到重复，不会操作当前行
INSERT IGNORE INTO yg_company_info(company_name,tel,company_type,province,city,district,address,ruins_code,ruins_price,price_unit,yyzz_url,create_time,create_user_id,create_user_name)
SELECT company_name,tel,customer_type,province,city,district,address,big_ruins_code,ruins_price,runis_price_unit,certificate1,create_time,create_user_id,create_user_name
FROM yl_customer_info s
WHERE s.register_date BETWEEN '2017-07-31' AND '2017-08-25'