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Excel公式与函数的理解

Excel公式与函数的理解
我们经常在一些学习资料中看到【Excel公式与函数】这样的表述。那么这两个术语【公式】【函数】到底有什么关系和区别?为什么总是把“公式”和“函数”放在一起说?它们到底是不是一回事?
很多初学者容易将这两个概念混为一谈,但在Excel的底层逻辑里,两者是“整体”与“零件”的关系。搞清楚这点,你写公式时会通透很多。

1. 一句话分清“公式”与“函数”

  • 公式(Formula):必须以等号 = 开头。=等号及其后面的所有内容形成完整计算表达式。这样一个整体。称之为公式。

    举例1:=单元格引用及运算符+加号

    举例2:=函数(参数)

    举例3:=函数(参数)、运算符及数值

  • 函数(Function):是Excel内置好的、具备特定功能的“预制零件”。它包含在公式中才能正常执行。

    举例:SUM()求和函数

    SUM是求和函数名。

    (B2:D2)是函数的参数。其中的B2:D2是单元格区域引用

    如果删除公式中的=等号,只保留函数(参数)。则不能获得运算结果。

所以,函数是包含在公式中的特定功能部件。

由于多数情况下,一个公式由=等号和一个函数组成。这时大家就认为这是函数。而忽略了=的作用。如果公式中去除=。那么函数是无法单独运行的。

2. 拆解一个完整的“公式与函数”

举例:判断学生三科的平均分是否及格

公式:=IF(SUM(B2:D2)/3>=60, "及格", "不及格")

公式拆解:

        1)必须的公式运算符=

        2)分支判断函数IF(参数1,参数2,参数3)

            参数1:SUM(B2:D2)/3>=60

            参数2:"及格"

            参数3:"不及格"

        3)求和函数SUM(参数)

        4)B2:D2 单元格区域引用

        5)/ 除法运算符

        6)3 这是数字(代表3个课程科目)

        7)>=比较运算符。比较3科平均分与及格分60

        8)"及格"  "不及格" 这是字符串,必须用""包裹

函数:这个公式中使用了两个函数 IF函数、SUM函数
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  1. CONNECT:[ UseTime:0.001194s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001612s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000752s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000670s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001375s ]
  6. SELECT * FROM `set` [ RunTime:0.000602s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001493s ]
  8. SELECT * FROM `article` WHERE `id` = 808368 LIMIT 1 [ RunTime:0.002668s ]
  9. UPDATE `article` SET `lasttime` = 1782636028 WHERE `id` = 808368 [ RunTime:0.021150s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000719s ]
  11. SELECT * FROM `article` WHERE `id` < 808368 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001205s ]
  12. SELECT * FROM `article` WHERE `id` > 808368 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001257s ]
  13. SELECT * FROM `article` WHERE `id` < 808368 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002320s ]
  14. SELECT * FROM `article` WHERE `id` < 808368 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007525s ]
  15. SELECT * FROM `article` WHERE `id` < 808368 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006657s ]
0.230080s