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Excel函数应用基础篇|文本函数(一)截取家族MID(B)+LEFT(B)+RIGHT(B)+LEN(B)

  • 2026-04-06 00:18:36
Excel函数应用基础篇|文本函数(一)截取家族MID(B)+LEFT(B)+RIGHT(B)+LEN(B)

Excel函数应用基础篇|文本函数(一)截取家族MID(B)+LEFT(B)+RIGHT(B)+LEN(B)

小伙们大家好,今天我们开始学习Excel中非常重要的文本函数系列。文本函数主要是处理数据中的文本,主要包括长度、截取、查找、替换、美容、英文大小写转换、文本字符和数字代码的转换等等一系列非常重要、使用频率非常高的函数,今天我们主要来学习如何处理文本的截取和获得文本的长度。

一.MID(B)函数

1.MID

MID 返回文本字符串中从指定位置开始的特定数目的字符,该数目由用户指定。
MID(text,start_num,num_chars)
MID(截取谁,从第几位开始,截取要保留的长度)
Text   是包含要提取字符的文本字符串。
Start_num   是文本中要提取的第一个字符的位置。文本中第一个字符的 start_num 为 1,以此类推。
Num_chars   指定希望 MID 从文本中返回字符的个数。
注意:
如果 start_num 大于文本长度,则 MID 返回空文本 ("")。
如果 start_num 小于文本长度,但 start_num 加上 num_chars 超过了文本的长度,则 MID 只返回至多直到文本末尾的字符。
如果 start_num 小于 1,则 MID 返回错误值#VALUE!。
如果 num_chars 是负数,则 MID 返回错误值#VALUE!。
看说明是不是有点懵,咱来点实例就明白了,这个函数其实也很简单。

实例1.

单元格A2有数据"EXCEL学着玩"(下同),我们要获得前5个文本的内容:
=MID(A2,1,5)
MID的第1个参数就是告诉要截取谁,第2个参数是从第几位开始,第三个参数就是要保留几位。

实例2.

如果第2个参数从第几位开始,大于要截取的文本,则返回空白。
=MID(B2,10,5)

实例3.

如果要保留的位数,是一个非常的的数字,譬如要保留99位,远远超过指定文本的长度,则 MID 只返回至多直到文本末尾的字符。
=MID(A2,6,99)

实例4.

如果第2个参数从第几位开始,小于1,则返回错误值。
=MID(A2,0.8,5)

实例5.

如果第3个参数是负数,则 MID 返回错误值。
=MID(A2,1,-5)

实例6.

如果第3个参数是小数,则取整。

2.MIDB

MIDB函数返回文本字符串中从指定位置开始的特定数目的字符,该数目由用户指定.此函数用于双字节字符,包括LEFTB,RIGHTB,FINDB,SEARCHB等函数,这一类后面带“B”的函数,按字节来处理数据。

实例7.

=MIDB(A2,6,2)
因为一个文字等于两个字节,一个英文字母或数字是一个字节,MIDB(A2,6,2)的意义是从第6个字节开始提取,共提取2个字节,因此提取的是“学”1个字。

二、LEFT(B)函数

1.LEFT

LEFT 基于所指定的字符数返回文本字符串中的第一个或前几个字符。
LEFT(text,num_chars)
LEFT(从左边截取谁,截取后保留几位)
Text   是包含要提取字符的文本字符串。
Num_chars   指定要由 LEFT 所提取的字符数。
Num_chars 必须大于或等于 0。
如果 num_chars 大于文本长度,则 LEFT 返回所有文本。
如果省略 num_chars,则假定其为 1。

实例8.

单元格A2有数据"EXCEL学着玩"(下同),我们要获得前5个文本的内容:
=LEFT(A2,5)

实例9.

如果省略第2个参数,则保留1位。
=LEFT(B2)
其他的需要注意的事项和MID函数一样,不再举例,大家可以多练习。

2.LEFTB

实例10.

=LEFTB(A2,6)
我们从第1位开始,左取6位,因为英文字母是1个字节,汉字是2个字节,所以返回前5位。

三、RIGHT(B)函数

RIGHT函数根据所指定的字符数返回文本字符串中最后一个或多个字符,只不过是从指定的文本右边开始截取,用法和LEFT(B)函数一样,这里就不再举例,大家多练习,会很快的掌握。

四、LEN(B)函数

这两个函数很简单,就一个参数,返回指定文本字符串中的字符数或长度。LENB返回指定文本字符串中的字符的字节数或长度。

实例11.

=LEN(A2)
返回8,因为LEN是以字符数查长度。

实例12.

=LENB(A2)
返回11,因为LENB是以字节数返回长度。
好了,今天就聊到这,这几个函数也很简单,很容易掌握,平时我们在工作中也经常用到,小伙伴们要多加练习,熟练掌握他们的用法和需要注意的事项。有什么不懂的地方,或在工作中遇到的实际问题,打到评论区,让我们一起搞懂他!

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  1. CONNECT:[ UseTime:0.001293s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001611s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000783s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000726s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001341s ]
  6. SELECT * FROM `set` [ RunTime:0.000659s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001462s ]
  8. SELECT * FROM `article` WHERE `id` = 481580 LIMIT 1 [ RunTime:0.001045s ]
  9. UPDATE `article` SET `lasttime` = 1775946673 WHERE `id` = 481580 [ RunTime:0.006251s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000727s ]
  11. SELECT * FROM `article` WHERE `id` < 481580 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001000s ]
  12. SELECT * FROM `article` WHERE `id` > 481580 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000918s ]
  13. SELECT * FROM `article` WHERE `id` < 481580 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001931s ]
  14. SELECT * FROM `article` WHERE `id` < 481580 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002950s ]
  15. SELECT * FROM `article` WHERE `id` < 481580 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002087s ]
0.200731s