一、目的
数据清洗是数据治理的关键，是提高数据质量的核心！数据清洗后，还有错误数据、清洗记录、数据重复性、数据准确性、错误数据修复、缺少数据补全等等
二、清洗步骤（以转向比数据为案例）
2.1 ODS层原始数据
create external table if not exists hurys_db.ods_turnratio(
device_no string comment '设备编号',
source_device_type string comment '设备类型',
sn string comment '设备序列号 ',
model string comment '设备型号',
create_time string comment '创建时间',
cycle int comment '转向比数据周期' ,
volume_sum int comment '指定时间段内通过路口的车辆总数',
speed_avg float comment '指定时间段内通过路口的所有车辆速度的平均值',
volume_left int comment '指定时间段内通过路口的左转车辆总数',
speed_left float comment '指定时间段内通过路口的左转车辆速度的平均值',
volume_straight int comment '指定时间段内通过路口的直行车辆总数',
speed_straight float comment '指定时间段内通过路口的直行车辆速度的平均值',
volume_right int comment '指定时间段内通过路口的右转车辆总数',
speed_right float comment '指定时间段内通过路口的右转车辆速度的平均值',
volume_turn int comment '指定时间段内通过路口的掉头车辆总数',
speed_turn float comment '指定时间段内通过路口的掉头车辆速度的平均值'
)
comment '转向比数据外部表——静态分区'
partitioned by (day string)
row format delimited fields terminated by ','
stored as SequenceFile
;
2.2 DWD层原始数据清洗
主要是数据格式、数值范围以及逻辑方面的清洗
2.2.1 建表语句
create table if not exists hurys_db.dwd_turnratio(
id string comment '唯一ID',
device_no string comment '设备编号',
source_device_type string comment '设备类型',
sn string comment '设备序列号 ',
model string comment '设备型号',
create_time string comment '创建时间',
cycle int comment '转向比数据周期' ,
volume_sum int comment '指定时间段内通过路口的车辆总数',
speed_avg decimal(10,2) comment '指定时间段内通过路口的所有车辆速度的平均值',
volume_left int comment '指定时间段内通过路口的左转车辆总数',
speed_left decimal(10,2) comment '指定时间段内通过路口的左转车辆速度的平均值',
volume_straight int comment '指定时间段内通过路口的直行车辆总数',
speed_straight decimal(10,2) comment '指定时间段内通过路口的直行车辆速度的平均值',
volume_right int comment '指定时间段内通过路口的右转车辆总数',
speed_right decimal(10,2) comment '指定时间段内通过路口的右转车辆速度的平均值',
volume_turn int comment '指定时间段内通过路口的掉头车辆总数',
speed_turn decimal(10,2) comment '指定时间段内通过路口的掉头车辆速度的平均值'
)
comment '转向比数据表——动态分区'
partitioned by (day string) --分区字段不能是表中已经存在的数据，可以将分区字段看作表的伪列。
stored as orc --表存储数据格式为orc
;
2.2.2 清洗规则
2.2.3 清洗SQL
with t1 as (
select
device_no,
source_device_type,
sn,
model,
create_time,
cycle,
case when volume_sum is null then 0 else volume_sum end as volume_sum,
case when speed_avg is null then 0 else cast(speed_avg as decimal(10,2)) end as speed_avg,
case when volume_left is null then 0 else volume_left end as volume_left ,
case when speed_left is null then 0 else cast(speed_left as decimal(10,2)) end as speed_left,
case when volume_straight is null then 0 else volume_straight end as volume_straight,
case when speed_straight is null then 0 else cast(speed_straight as decimal(10,2)) end as speed_straight,
case when volume_right is null then 0 else volume_right end as volume_right,
case when speed_right is null then 0 else cast(speed_right as decimal(10,2)) end as speed_right ,
case when volume_turn is null then 0 else volume_turn end as volume_turn ,
case when speed_turn is null then 0 else cast(speed_turn as decimal(10,2)) end as speed_turn,
substr(create_time,1,10) day
from hurys_db.ods_turnratio
where day ='2024-09-10'
)
insert overwrite table hurys_db.dwd_turnratio partition (day)
select
UUID() as id,
device_no,
source_device_type,
sn,
model,
create_time,
cycle,
volume_sum,
speed_avg,
volume_left,
speed_left,
volume_straight,
speed_straight,
volume_right,
speed_right,
volume_turn,
speed_turn,
day
from t1
where day ='2024-09-10' and device_no is not null and create_time is not null
and volume_sum between 0 and 1000 and speed_avg between 0 and 150
and volume_left between 0 and 1000 and speed_left between 0 and 100
and volume_straight between 0 and 1000 and speed_straight between 0 and 150
and volume_right between 0 and 1000 and speed_right between 0 and 100
and volume_turn between 0 and 100 and speed_turn between 0 and 100
group by device_no, source_device_type, sn, model, create_time, cycle, volume_sum, speed_avg, volume_left, speed_left, volume_straight, speed_straight, volume_right, speed_right, volume_turn, speed_turn, day
;
2.3 转向比错误数据表
2.3.1 建表语句
create table if not exists hurys_db.dwd_turnratio_error(
id string comment '唯一ID',
device_no string comment '设备编号',
source_device_type string comment '设备类型',
sn string comment '设备序列号 ',
model string comment '设备型号',
create_time string comment '创建时间',
cycle int comment '转向比数据周期' ,
volume_sum int comment '指定时间段内通过路口的车辆总数',
speed_avg float comment '指定时间段内通过路口的所有车辆速度的平均值',
volume_left int comment '指定时间段内通过路口的左转车辆总数',
speed_left float comment '指定时间段内通过路口的左转车辆速度的平均值',
volume_straight int comment '指定时间段内通过路口的直行车辆总数',
speed_straight float comment '指定时间段内通过路口的直行车辆速度的平均值',
volume_right int comment '指定时间段内通过路口的右转车辆总数',
speed_right float comment '指定时间段内通过路口的右转车辆速度的平均值',
volume_turn int comment '指定时间段内通过路口的掉头车辆总数',
speed_turn float comment '指定时间段内通过路口的掉头车辆速度的平均值'
)
comment '转向比错误数据表——动态分区'
partitioned by (day string) --分区字段不能是表中已经存在的数据，可以将分区字段看作表的伪列。
stored as orc --表存储数据格式为orc
;
2.3.2 SQL语句
insert overwrite table hurys_db.dwd_turnratio_error partition(day)
select
UUID() as id,
t2.device_no, t2.source_device_type,t2.sn, t2.model, t2.create_time, t2.cycle, t2.volume_sum,
t2.speed_avg, t2.volume_left, t2.speed_left, t2.volume_straight, t2.speed_straight, t2.volume_right,
t2.speed_right, t2.volume_turn, t2.speed_turn, t2.day
from hurys_db.ods_turnratio as t2
left join hurys_db.dwd_turnratio as t3
on t3.device_no=t2.device_no and t3.create_time=t2.create_time
where t3.device_no is null and t3.create_time is null and t2.day='2024-09-10'
;
2.4 转向比数据清洗记录表
2.4.1 建表语句
create table if not exists hurys_db.dwd_data_clean_record_turnratio(
id string comment '唯一ID',
data_type int comment '1:转向比,2:统计,3:评价,4:区域,5:过车,6:静态排队,7:动态排队,8:轨迹,9:事件数据,10:事件资源',
device_no string comment '设备编号',
create_time string comment '创建时间',
field_name string comment '字段名',
field_value string comment '字段值'
)
comment '转向比数据清洗记录表'
partitioned by (day string)
stored as orc
;
2.4.2 SQL语句
with t3 as(
select
id,
device_no,
case when device_no is null then CONCAT('device_no:', 'null') END AS device_no_value,
create_time,
case when volume_sum < 0 or volume_sum >1000 then CONCAT('volume_sum:', CAST(volume_sum AS STRING)) END AS volume_sum_value,
case when speed_avg < 0 or speed_avg >150 then CONCAT('speed_avg:', CAST(speed_avg AS STRING)) END AS speed_avg_value,
case when volume_left < 0 or volume_left >1000 then CONCAT('volume_left:', CAST(volume_left AS STRING)) END AS volume_left_value,
case when speed_left < 0 or speed_left >100 then CONCAT('speed_left:', CAST(speed_left AS STRING)) END AS speed_left_value,
case when volume_straight < 0 or volume_straight >1000 then CONCAT('volume_straight:', CAST(volume_straight AS STRING)) END AS volume_straight_value,
case when speed_straight < 0 or speed_straight >150 then CONCAT('speed_straight:', CAST(speed_straight AS STRING)) END AS speed_straight_value,
case when volume_right < 0 or volume_right >1000 then CONCAT('volume_right:', CAST(volume_right AS STRING)) END AS volume_right_value,
case when speed_right < 0 or speed_right >100 then CONCAT('speed_right:', CAST(speed_right AS STRING)) END AS speed_right_value,
case when volume_turn < 0 or volume_turn >100 then CONCAT('volume_turn:', CAST(volume_turn AS STRING)) END AS volume_turn_value,
case when speed_turn < 0 or speed_turn >100 then CONCAT('speed_turn:', CAST(speed_turn AS STRING)) END AS speed_turn_value,
concat_ws(',',
case when device_no is null then CONCAT('device_no:','null') END ,
case when volume_sum < 0 or volume_sum >1000 then CONCAT('volume_sum:', CAST(volume_sum AS STRING)) END,
case when speed_avg < 0 or speed_avg >150 then CONCAT('speed_avg:', CAST(speed_avg AS STRING)) END,
case when volume_left < 0 or volume_left >1000 then CONCAT('volume_left:', CAST(volume_left AS STRING)) END,
case when speed_left < 0 or speed_left >100 then CONCAT('speed_left:', CAST(speed_left AS STRING)) END,
case when volume_straight < 0 or volume_straight >1000 then CONCAT('volume_straight:', CAST(volume_straight AS STRING)) END,
case when speed_straight < 0 or speed_straight >150 then CONCAT('speed_straight:', CAST(speed_straight AS STRING)) END,
case when volume_right < 0 or volume_right >1000 then CONCAT('volume_right:', CAST(volume_right AS STRING)) END,
case when speed_right < 0 or speed_right >100 then CONCAT('speed_right:', CAST(speed_right AS STRING)) END,
case when volume_turn < 0 or volume_turn >100 then CONCAT('volume_turn:', CAST(volume_turn AS STRING)) END,
case when speed_turn < 0 or speed_turn >100 then CONCAT('speed_turn:', CAST(speed_turn AS STRING)) END
) AS kv_pairs ,
day
from hurys_db.dwd_turnratio_error
where day='2024-09-10'
)
insert overwrite table hurys_db.dwd_data_clean_record_turnratio partition(day)
select
id,
'1' data_type,
t3.device_no,
create_time,
split(pair, ':')[0] AS field_name,
split(pair, ':')[1] AS field_value,
day
from t3
lateral view explode(split(t3.kv_pairs , ',')) exploded_table AS pair
where device_no_value is not null or volume_sum_value is not null or volume_left_value is not null
or volume_right_value is not null or volume_straight_value is not null or volume_turn_value is not null
or speed_avg_value is not null or speed_left_value is not null or speed_right_value is not null
or speed_straight_value is not null or speed_turn_value is not null
;
2.5 数据重复性统计表
2.5.1 建表语句
create table if not exists hurys_db.dwd_data_duplicate(
data_type int comment '1:转向比,2:统计,3:评价,4:区域,5:过车,6:静态排队,7:动态排队,8:轨迹,9:事件数据,10:事件资源',
device_no string comment '设备编号',
data_duplicate float comment '数据重复率'
)
comment '数据重复性统计表'
partitioned by (day string)
stored as orc
;
2.5.2 SQL语句
insert overwrite table hurys_db.dwd_data_duplicate partition(day)
select
'1' data_type,
device_no,
round(sum(num)/count_num,2) data_duplicate,
day
from (select
device_no,
create_time,
count(1) num,
count_num,
day
from (select
device_no,
create_time ,
count(device_no) over(partition by device_no,day) count_num ,
day
from hurys_db.ods_turnratio
where day='2024-09-04'
) as t2
group by device_no, create_time, count_num, day
having count(1) > 1
) as t3
group by device_no, count_num, day;
2.6 数据准确性统计表
2.6.1 建表语句
create table if not exists hurys_db.dwd_data_accuracy(
data_type int comment '1:转向比,2:统计,3:评价,4:区域,5:过车,6:静态排队,7:动态排队,8:轨迹,9:事件数据,10:事件资源',
device_no string comment '设备编号',
field_name string comment '字段名',
data_unreasonable_rate float comment '数据不合理率',
data_null_rate float comment '数据空值率'
)
comment '数据准确性统计表'
partitioned by (day string)
stored as orc
;
2.6.2 SQL语句
insert overwrite table hurys_db.dwd_data_accuracy partition(day)
select
t1.data_type,
t1.device_no,
t1.field_name,
round((sum(case when t1.field_value is not null then 1 else 0 end)/t2.count_device_all),2) data_unreasonable_rate,
round((sum(case when t1.field_value is null then 1 else 0 end)/t2.count_device_all),2) data_null_rate ,
t1.day
from hurys_db.dwd_data_clean_record_turnratio as t1
left join (select
device_no,
day,
count(device_no) count_device_all
from hurys_db.ods_turnratio
where day='2024-09-04'
group by device_no, day
) as t2
on t2.device_no=t1.device_no and t2.day=t1.day
where t2.count_device_all is not null
group by t1.data_type, t1.device_no, t1.field_name, t2.count_device_all, t1.day;
2.7 转向比字段数据修复
2.7.1 修复策略
使用前三周同期数据取平均进行修复
2.7.2 SQL语句
insert into table hurys_db.dwd_turnratio partition(day)
select
a3.id,
a3.device_no,
a3.source_device_type,
a3.sn,
a3.model,
a3.create_time,
a3.cycle,
case when a3.volume_sum between 0 and 1000 then a3.volume_sum else a2.avg_volume_sum end as volume_sum ,
case when a3.speed_avg between 0 and 150 then a3.speed_avg else a2.avg_speed_avg end as speed_avg,
case when a3.volume_left between 0 and 1000 then a3.volume_left else a2.avg_volume_left end as volume_left,
case when a3.speed_left between 0 and 100 then a3.speed_left else a2.avg_speed_left end as speed_left,
case when a3.volume_straight between 0 and 1000 then a3.volume_straight else a2.avg_volume_straight end as volume_straight ,
case when a3.speed_straight between 0 and 150 then a3.speed_straight else a2.avg_speed_straight end as speed_straight,
case when a3.volume_right between 0 and 1000 then a3.volume_right else a2.avg_volume_right end as volume_right ,
case when a3.speed_right between 0 and 100 then a3.speed_right else a2.avg_speed_right end as speed_right,
case when a3.volume_turn between 0 and 100 then a3.volume_turn else a2.avg_volume_turn end as volume_turn,
case when a3.speed_turn between 0 and 100 then a3.speed_turn else a2.avg_speed_turn end as speed_turn,
day
from hurys_db.dwd_turnratio_error as a3
right join (select
a1.device_no,
a1.create_time,
round(avg(volume_sum),0) avg_volume_sum,
round(avg(speed_avg),2) avg_speed_avg,
round(avg(volume_left),0) avg_volume_left,
round(avg(speed_left),2) avg_speed_left,
round(avg(volume_straight),0) avg_volume_straight,
round(avg(speed_straight),2) avg_speed_straight,
round(avg(volume_right),0) avg_volume_right,
round(avg(speed_right),2) avg_speed_right,
round(avg(volume_turn),0) avg_volume_turn,
round(avg(speed_turn),2) avg_speed_turn
from(select
t1.device_no, t1.create_time start_time, t2.create_time, t1.volume_sum, t1.speed_avg, t1.volume_left, t1.speed_left,
t1.volume_straight, t1.speed_straight, t1.volume_right, t1.speed_right, t1.volume_turn, t1.speed_turn
from hurys_db.dwd_turnratio as t1
right join hurys_db.dwd_turnratio_error as t2
on t2.device_no=t1.device_no and concat(date_sub(t2.create_time,7),substr(t2.create_time,11,10)) = t1.create_time
where t1.device_no is not null
union all
select
t1.device_no, t1.create_time start_time, t2.create_time, t1.volume_sum, t1.speed_avg, t1.volume_left, t1.speed_left,
t1.volume_straight, t1.speed_straight, t1.volume_right, t1.speed_right, t1.volume_turn, t1.speed_turn
from hurys_db.dwd_turnratio as t1
right join hurys_db.dwd_turnratio_error as t2
on t2.device_no=t1.device_no and concat(date_sub(t2.create_time,14),substr(t2.create_time,11,10)) = t1.create_time
where t1.device_no is not null
union all
select
t1.device_no, t1.create_time start_time, t2.create_time, t1.volume_sum, t1.speed_avg, t1.volume_left, t1.speed_left,
t1.volume_straight, t1.speed_straight, t1.volume_right, t1.speed_right, t1.volume_turn, t1.speed_turn
from hurys_db.dwd_turnratio as t1
right join hurys_db.dwd_turnratio_error as t2
on t2.device_no=t1.device_no and concat(date_sub(t2.create_time,21),substr(t2.create_time,11,10)) = t1.create_time
where t1.device_no is not null) as a1
group by a1.device_no, create_time
) as a2
on a3.device_no=a2.device_no and a3.create_time=a2.create_time
where a3.day='2024-09-04'
;
2.8 转向比整条数据补全
2.8.1 补全策略
使用前三周同期数据取平均进行补全
2.8.2 SQL语句
insert into table hurys_db.dwd_turnratio partition(day)
select
UUID() as id,
a3.device_no,
a3.source_device_type,
a3.sn,
a3.model,
a3.miss_time create_time,
round(avg(cycle),0) cycle,
round(avg(volume_sum),0) volume_sum,
round(avg(speed_avg),2) speed_avg,
round(avg(volume_left),0) volume_left,
round(avg(speed_left),2) speed_left,
round(avg(volume_straight),0) volume_straight,
round(avg(speed_straight),2) speed_straight,
round(avg(volume_right),0) volume_right,
round(avg(speed_right),2) speed_right,
round(avg(volume_turn),0) volume_turn,
round(avg(speed_turn),2) speed_turn,
a3.day
from(
with a2 as (
select
a1.device_no,a1.day,all_time miss_time, a1.source_device_type, a1.sn, a1.model
from (select
t1.device_no,t1.day,t1.source_device_type, t1.sn, t1.model,
concat(substr(t1.create_time, 1, 11), t2.frequency_time) all_time
from hurys_db.dwd_turnratio as t1
cross join hurys_db.dwd_frequency_time as t2
where t1.day = '2024-09-04' and t2.frequency_rate='5分钟'
group by t1.device_no, t1.day, t1.source_device_type, t1.sn, t1.model, concat(substr(t1.create_time, 1, 11), t2.frequency_time)
) as a1
left join hurys_db.dwd_turnratio as t3
on a1.device_no=t3.device_no and a1.all_time=t3.create_time and t3.day='2024-09-04'
where t3.create_time is null
)
select
a2.device_no, a2.source_device_type, a2.sn, a2.model, a2.miss_time,t4.create_time, t4.cycle,
t4.volume_sum, t4.speed_avg, t4.volume_left, t4.speed_left,t4.volume_straight,
t4.speed_straight, t4.volume_right, t4.speed_right, t4.volume_turn, t4.speed_turn,a2.day
from a2
left join hurys_db.dwd_turnratio as t4
on a2.device_no=t4.device_no and concat(date_sub(a2.miss_time,7),substr(a2.miss_time,11,10)) = t4.create_time
where t4.device_no is not null
union all
select
a2.device_no, a2.source_device_type, a2.sn, a2.model, a2.miss_time,t4.create_time, t4.cycle,
t4.volume_sum, t4.speed_avg, t4.volume_left, t4.speed_left,t4.volume_straight,
t4.speed_straight, t4.volume_right, t4.speed_right, t4.volume_turn, t4.speed_turn,a2.day
from a2
left join hurys_db.dwd_turnratio as t4
on a2.device_no=t4.device_no and concat(date_sub(a2.miss_time,14),substr(a2.miss_time,11,10)) = t4.create_time
where t4.device_no is not null
union all
select
a2.device_no, a2.source_device_type, a2.sn, a2.model, a2.miss_time,t4.create_time, t4.cycle,
t4.volume_sum, t4.speed_avg, t4.volume_left, t4.speed_left,t4.volume_straight,
t4.speed_straight, t4.volume_right, t4.speed_right, t4.volume_turn, t4.speed_turn,a2.day
from a2
left join hurys_db.dwd_turnratio as t4
on a2.device_no=t4.device_no and concat(date_sub(a2.miss_time,21),substr(a2.miss_time,11,10)) = t4.create_time
where t4.device_no is not null
) as a3
group by a3.device_no, a3.source_device_type, a3.sn, a3.model, a3.miss_time, a3.day
;
2.9 数据补全以及数据修复记录表
2.9.1 建表语句
create table if not exists hurys_db.dwd_data_correction_record(
data_type int comment '数据类型 1:转向比,2:统计,3:评价,4:区域,6:静态排队,7:动态排队',
device_no string comment '设备编号',
id string comment '唯一ID',
create_time timestamp comment '创建时间',
record_type int comment '记录类型 0:补全,1:修复'
)
comment '数据补全以及数据修复记录表'
partitioned by (day string)
stored as orc
;
2.9.2 SQL语句
2.9.2.1 转向比数据修复记录
insert into table hurys_db.dwd_data_correction_record partition(day)
select
'1' data_type,
t1.device_no,
t1.id,
t1.create_time,
'1' record_type,
t1.day
from hurys_db.dwd_turnratio_error as t1
right join hurys_db.dwd_turnratio as t2
on t1.id=t2.id and t1.device_no=t2.device_no
where t1.id is not null and t1.day='2024-09-04'
;
2.9.2.2 转向比补全记录
insert into table hurys_db.dwd_data_correction_record partition(day)
select
'1' data_type,
t2.device_no,
t2.id,
t2.create_time,
'0' record_type,
t2.day
from hurys_db.dwd_turnratio as t2
left join (
select
device_no, create_time, day
from hurys_db.ods_turnratio
where day='2024-09-04'
) as t3
on t3.device_no=t2.device_no and t3.create_time=t2.create_time
where t3.device_no is null and t3.create_time is null and t2.day='2024-09-04'
;
搞定！目前数据清洗这一层就这么多，后面继续完善！
本文转载自: https://blog.csdn.net/tiantang2renjian/article/details/142358838
版权归原作者 天地风雷水火山泽 所有， 如有侵权，请联系我们删除。
版权归原作者 天地风雷水火山泽 所有， 如有侵权，请联系我们删除。