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      1. 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?)

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                • 本文介绍了SQL函数获取字符串在列中出现的次数?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  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?

                  这篇关于SQL函数获取字符串在列中出现的次数?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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