当前位置:首页>Excel>LET 不只是简化公式,它正在重构 Excel 的“计算架构” | 普通公式管理结果,LET 管理计算过程——让你的 公式像程序一样可维护

LET 不只是简化公式,它正在重构 Excel 的“计算架构” | 普通公式管理结果,LET 管理计算过程——让你的 公式像程序一样可维护

  • 2026-06-16 01:02:59
LET 不只是简化公式,它正在重构 Excel 的“计算架构” | 普通公式管理结果,LET 管理计算过程——让你的 公式像程序一样可维护
本文字数:1411,阅读时长约5分钟

内容摘要:

Excel 公式越来越长、难维护?多层 LET 嵌套可以缓存中间结果、组织复杂逻辑、提高公式性能,让计算结构清晰可调试。结合 FILTER、SORT,你不仅能快速筛选高毛利产品,还能生成可复用的结构化结果。掌握 LET,你的 Excel 不再只是“公式工具”,而是小型计算系统,实现“能用、好用、可维护、可复用”。

01|痛点:公式越来越像“意大利面”

很多人学 Excel 到后期会发现:公式越来越长,越来越乱。

“能跑,但看不懂,不敢改,越来越卡!”

例如:

=SUMIFS(...XLOOKUP(FILTER(IF(...))))

公式越长越复杂,尤其是涉及多层计算和条件筛选时。

“公式能跑不等于可维护,高手设计的是计算结构。”


02|LET 的核心价值:缓存 + 架构

  • LET 不是简单“给变量命名”,而是 缓存计算结果、组织流程、提高性能
  • 避免重复扫描和重复计算
  • 让公式从“一次性表达”升级成“小型计算系统”

03|性能灾难案例:重复扫描

传统公式:

=SORT(UNIQUE(FILTER(A2:A50000,A2:A50000<>"")))
  • Excel 内部计算流程:
A2:A50000 → FILTER → UNIQUE → SORT
  • 再次引用 FILTER 会 重复扫描,性能低下

优化写法:

=LET(    data, A2:A50000,    clean, FILTER(data, data<>""),    SORT(UNIQUE(clean)))
  • 分步说明:
    • data:存储原始数据
    • clean:存储过滤后的结果
    • 最终计算:排序 + 唯一值

“Excel 不再反复扫描同一份数据”


04|高阶实战示例:多层 LET 嵌套

假设你有销售额和成本数据,想找出毛利率超过平均水平 1.2 倍的“高价值产品”,并按毛利率降序排列:

=LET(

    _原始数据, '1. 原始数据'!$A$2:$G$3001,

    _商品序列, INDEX(_原始数据,,4),

    _销售额序列, INDEX(_原始数据,,5),

    _成本序列, INDEX(_原始数据,,6),

_核心逻辑层, LET(

        _毛利率, IFERROR((_销售额序列 - _成本序列) / _销售额序列, 0),

        _平均值, AVERAGE(_毛利率),

        _判定阈值, _平均值 * 1.2,

        _筛选结果, FILTER(

            HSTACK(_商品序列, _毛利率, IF(_毛利率 > _判定阈值, "高价值产品", "普通产品")),

            _毛利率 > _判定阈值

        ),

        SORT(_筛选结果, 2, -1)

    ),

    _核心逻辑层

)

分析

  1. 第一层 LET
    :定义销售额、成本 → 计算毛利、毛利率、平均毛利率
  2. 第二层 LET
    :筛选高毛利产品 → 排序
  3. 最终输出
    :返回优秀产品列表

“LET + LET 嵌套 = 多层逻辑缓存 + 结构化计算”


05|可维护性提升

传统公式

=IF(SUMIFS(...FILTER(...))>0,...)

LET 写法

  • 每个逻辑块命名
  • 中间结果可调试
  • 公式逻辑像小型程序

“不会 LET,你写公式;会 LET,你设计系统。”


06|高手思维 vs 普通人

普通人
高手
写出结果
设计计算结构
单次表达
多步缓存、模块化
公式越长越乱
公式逻辑清晰、可维护

07|拆模块思维:函数分工 + LET 管理流程

函数分工

  • FILTER
     → 取数据
  • UNIQUE
     → 生成维度
  • SORT
     → 输出顺序
  • LET
     → 组织计算流程

流程图示意

“LET 不是功能函数,而是架构函数。”


08|边界思考:什么时候放弃 LET

原则总结

“LET 擅长行内/区域内快速逻辑,Power Query 才是重型数据工厂。”


09|总结:Excel 从“计算器”到“轻量编程环境”

  • LET 带来的改变:
    • 变量
    • 作用域
    • 计算复用
    • 结构化表达

“普通公式管理结果,LET 管理计算过程。”

为了便于大家直观感受LET应用场景,私信回复LET获取Excel示例文件一探究竟。


END

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从公式搬运工到数据架构师:FILTER + SORT + UNIQUE + XLOOKUP,让 Excel 变成系统

一张图看懂现金流量表:为什么利润会“骗你”

预算执行分析怎么做?|为什么90%的分析,管理层根本不看

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  1. CONNECT:[ UseTime:0.000436s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000534s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000270s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000539s ]
  8. SELECT * FROM `article` WHERE `id` = 514270 LIMIT 1 [ RunTime:0.017997s ]
  9. UPDATE `article` SET `lasttime` = 1781572411 WHERE `id` = 514270 [ RunTime:0.025054s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.008262s ]
  11. SELECT * FROM `article` WHERE `id` < 514270 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.013140s ]
  12. SELECT * FROM `article` WHERE `id` > 514270 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006570s ]
  13. SELECT * FROM `article` WHERE `id` < 514270 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.026158s ]
  14. SELECT * FROM `article` WHERE `id` < 514270 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006925s ]
  15. SELECT * FROM `article` WHERE `id` < 514270 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009541s ]
0.191007s