SQL函数获取字符串在列中出现的次数?

SQL function to get count of how many times string appears in column?(SQL函数获取字符串在列中出现的次数?)

问题描述

是否有用于计算字符串在另一个字符串或列中出现的次数的 MySQL 函数?基本上我想要:

Is there a function for MySQL that will count the number of times a string occurs in another string or column? Basically I want:

SELECT
    SUB_COUNT('my word', `my_column`) AS `match_count`
FROM `table`

谢谢！

我需要知道字符串在 SELECT 中的每一行的列中出现多少次.

I need to know how many times the string appears in a column for each row in a SELECT.

推荐答案

一个明显但不可扩展的方式是这样的

An obvious but unscalable way is like this

(LENGTH(`my_column`) - LENGTH(REPLACE(`my_column`, 'my word', '')))/LENGTH('my word')

您是否调查过全文搜索在 MySQL 中?

Have you investigated Full Text search in MySQL?

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