php - 查找并替换数据库中的重复字符串

Question

我的表格的某行中有问题数据，例如以下字符串

[data attr1='2300.48' attr1='1' attr1='1116.95' attr1='60.75' attr1='9.22' attr1='' attr1='0' attr1='3593.39' attr1='119.05' attr1='25.96' attr1='27.98' attr1='36.32']

[data attr1='2300.48' attr1='1' attr1='1116.95' attr1='60.75' attr1='9.22' attr1='' attr1='0' attr1='3593.39' attr1='119.05' attr1='25.96' attr1='27.98' attr1='36.32']

[data attr1='2300.48' attr1='1' attr1='1116.95' attr1='60.75' attr1='9.22' attr1='' attr1='0' attr1='3593.39' attr1='119.05' attr1='25.96' attr1='27.98' attr1='36.32']

[data attr1='2300.48' attr1='1' attr1='1116.95' attr1='60.75' attr1='9.22' attr1='' attr1='0' attr1='3593.39' attr1='119.05' attr1='25.96' attr1='27.98' attr1='36.32'] 

现在我只想用一个相同的字符串替换它们，例如:

[data attr1='2300.48' attr1='1' attr1='1116.95' attr1='60.75' attr1='9.22' attr1='' attr1='0' attr1='3593.39' attr1='119.05' attr1='25.96' attr1='27.98' attr1='36.32']

请记住，attr 的值是变化的。

-- 更新--

它是如何存储在数据库中的 列名称称为 content，此列中的值为

the text of the article
 [data.... ]
 [data.... ]
 [data.... ]

content 的数据类型是longtext

抱歉，我无法创建正确的 sql 表结构。

预先感谢您的帮助。

Answer 1

您可以使用 DISTINCT 或 GROUP BY 来删除重复值，具体取决于其他需要。例如:

select distinct mycolumn from mytable;

或者:

select mycolumn from mytable group by mycolumn;