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目录
一、批量创建1万多条数据
数据库车辆信息表中准备10000多台车的数据：
（1）创建线程组，循环1次：
（2）连接数据池：
（3）添加循环控制器，循环15000次，超过10000是因为接下来的函数会生成重复的车牌号，要去掉重复数据，避免去掉后数据少于10000（模拟新增10000条数据）：
（4）新建新增车辆信息JDBC Request：
其中，车牌号运用jmeter的函数助手生成随机5位数，范围在20000~40000之间，20000个随机数，范围大于10000，使得重复的车牌号数据少一点：鄂A${__Random(20000,40000,)}：
（5）运行可生成15000条数据：
二、批量删除重复数据
（1）查询车牌号重复的所有数据：
-- 查询出common_car_info表中car_number重复的数据，car_number升序排列
select * from common_car_info where car_number in (select car_number from common_car_info group by car_number having count(car_number) > 1)
ORDER BY car_number ASC 
（2） 删除表中多余的重复记录，重复的车牌号数据都不保留：
-- 删除表中多余的重复记录，重复记录是根据单个字段（car_number）来判断，重复的车牌号数据都不保留
DELETE FROM common_car_info
WHERE car_number IN
(SELECT car_number FROM (SELECT car_number FROM common_car_info GROUP BY car_number HAVING count(car_number) > 1)e)
（3） 查询车牌号重复但不包括id最小的所有数据：
select * from common_car_info
WHERE car_number IN
(SELECT car_number FROM (SELECT car_number FROM common_car_info GROUP BY car_number HAVING count(car_number) > 1 )e)
AND id NOT IN
(SELECT min(id) FROM (SELECT min(id) FROM common_car_info GROUP BY car_number HAVING count(car_number) > 1)f)
（4）删除表中多余的重复记录，重复的车牌号只保留id最那一条的数据：
-- 删除表中多余的重复记录，重复记录是根据单个字段（car_number）来判断，只保留id最小的一条数据
-- 注意：因为用了子查询，所以需要 DELETE 后引用表别名
DELETE C.* FROM common_car_info C
WHERE
car_number IN
(SELECT car_number FROM (SELECT car_number FROM common_car_info GROUP BY car_number HAVING count(car_number) > 1 )e)
AND
id NOT IN
(SELECT min(id) FROM (SELECT min(id) FROM common_car_info GROUP BY car_number HAVING count(car_number) > 1)f)
