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Excel数据清洗的7个绝招,看完工作效率提升10倍

Excel数据清洗的7个绝招,看完工作效率提升10倍

数据清洗为什么重要

都说数据分析是"七分清洗,三分分析"。数据脏乱差,分析结果就不靠谱。原始数据到手,第一件事就是把它洗干净。

今天分享7个数据清洗的常用方法,都是实打实能用的。

第一招:去除空格

数据里经常有多余的空格,有的是开头有,有的是结尾有,有的是中间多了个空格。肉眼不一定看得出来,但会导致匹配失败。

清理方法

=TRIM(A1)  // 去除所有多余空格,只保留单词间单个空格

清理整列

在B列输入公式,拖动填充,然后复制B列,选择性粘贴为值到A列。

第二招:统一文本格式

有时候"北京"和"beijing"混在一起,或者大小写不统一,匹配的时候就会出问题。

统一为小写

=LOWER(A1)

统一为大写

=UPPER(A1)

首字母大写

=PROPER(A1)  // "beijing" 变成 "Beijing"

第三招:去除重复项

重复数据会导致统计结果虚高,必须清理掉。

方法1:删除重复项

数据 → 删除重复项 → 选择要检查的列 → 确定

方法2:标记重复项

=IF(COUNTIF($A$1:$A1, A1)>1, "重复", "")  // 第一个出现的标记为空,重复的标记"重复"

方法3:提取唯一值

如果有Excel 365,用UNIQUE函数:

=UNIQUE(A:A)  // 直接提取A列的唯一值

第四招:拆分单元格

一列里塞了多个信息,必须拆开。比如"姓名-部门"这种格式。

方法1:分列

数据 → 分列 → 分隔符号(选"-")→ 完成

方法2:公式拆分

=LEFT(A1, FIND("-", A1)-1)  // 取"-"前面的内容=RIGHT(A1, LEN(A1)-FIND("-", A1))  // 取"-"后面的内容

更智能的拆分

如果"-"的位置不固定:

=TRIM(LEFT(SUBSTITUTE(A1, "-", REPT(" ", 100)), 100))  // 第一个"-"前的部分

第五招:合并单元格

有拆就有合。有时候需要把多列信息合并成一列。

方法1:用&连接

=A1 & "-" & B1  // 中间加连接符=A1 & B1  // 直接拼接

方法2:用CONCATENATE(老方法)

=CONCATENATE(A1, "-", B1)

方法3:用TEXTJOIN(推荐)

=TEXTJOIN("-", TRUE, A1, B1, C1)  // 用"-"连接,可以合并多列,空值自动忽略

方法4:快速填充

先在第一行手动输入合并结果,然后按Ctrl+E智能填充。

第六招:处理日期

日期数据是最让人头疼的,格式乱七八糟:有的是"2024-01-01",有的是"2024/1/1",有的是"2024年1月1日",有的是文本"一月一日"。

统一为标准日期格式

=DATEVALUE(A1)  // 把文本日期转成日期序列值=TEXT(A1, "yyyy-mm-dd")  // 任意格式转标准格式

提取年月日

=YEAR(A1)  // 提取年份=MONTH(A1)  // 提取月份=DAY(A1)  // 提取日期

计算日期差

=DATEDIF(A1, B1, "d")  // 两日期相差多少天=DATEDIF(A1, TODAY(), "d")  // 距今天数

第七招:处理缺失值

数据里经常有空白单元格,有的是没采集到,有的是填了但故意留空。

识别缺失值

=IF(A1="", "缺失", A1)  // 标记为空白的单元格=COUNTBLANK(A:A)  // 统计空白单元格数量

批量填充缺失值

  1. 1. 按Ctrl+G → 定位条件 → 空值
  2. 2. 输入填充值
  3. 3. 按Ctrl+Enter

用公式填充

=IF(A1="", "未知", A1)  // 空白填充为"未知"=IF(A1="", B1, A1)  // 空白填充为B列对应的值(向前填充)=IF(A1="", A2, A1)  // 空白填充为A2的值(向后填充)

数据清洗流程建议

正确的清洗顺序:

  1. 1. 备份原始数据(先复制一份)
  2. 2. 去除空格(TRIM)
  3. 3. 统一格式(大小写、日期格式)
  4. 4. 处理缺失值(填充或标记)
  5. 5. 去除重复项(DELETE或标记)
  6. 6. 拆分/合并列(根据需要)
  7. 7. 最终检查(抽查确认)

常用清洗函数速查表

目的
函数
例子
去空格
TRIM
=TRIM(A1)
转小写
LOWER
=LOWER(A1)
转大写
UPPER
=UPPER(A1)
首大写
PROPER
=PROPER(A1)
去重复
UNIQUE
=UNIQUE(A:A)
合并
TEXTJOIN
=TEXTJOIN("-",TRUE,A1:C1)
拆分左
LEFT+FIND
=LEFT(A1,FIND("-",A1)-1)
拆分右
RIGHT+LEN
=RIGHT(A1,LEN(A1)-FIND("-",A1))
日期转值
DATEVALUE
=DATEVALUE(A1)
提取年
YEAR
=YEAR(A1)

总结

数据清洗是脏活累活,但做好了能让后面的分析事半功倍。记住这7招:

  1. 1. 去除空格
  2. 2. 统一格式
  3. 3. 去除重复
  4. 4. 拆分单元格
  5. 5. 合并单元格
  6. 6. 处理日期
  7. 7. 处理缺失值

用熟了你会发现,数据清洗其实也就那么回事。


标签:Excel技巧 | 数据清洗 | 数据处理 | 办公技巧

数据清洗才是Excel最被低估的功能!5招搞定90%的脏数据

Excel脏数据清洗的10个常用方法,看完秒变整理高手

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  1. CONNECT:[ UseTime:0.000508s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000872s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000293s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000299s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000682s ]
  6. SELECT * FROM `set` [ RunTime:0.000210s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000694s ]
  8. SELECT * FROM `article` WHERE `id` = 719012 LIMIT 1 [ RunTime:0.001075s ]
  9. UPDATE `article` SET `lasttime` = 1780714777 WHERE `id` = 719012 [ RunTime:0.006206s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000308s ]
  11. SELECT * FROM `article` WHERE `id` < 719012 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000637s ]
  12. SELECT * FROM `article` WHERE `id` > 719012 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000495s ]
  13. SELECT * FROM `article` WHERE `id` < 719012 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001010s ]
  14. SELECT * FROM `article` WHERE `id` < 719012 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001751s ]
  15. SELECT * FROM `article` WHERE `id` < 719012 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004192s ]
0.105497s