SQL查询以删除以特定文本开头和结尾的单元格中的文本

Question

I need to delete data from a column that begins and ends with specific text.

I have 800 records, the data between the text I want to remove is different in all the 800 records.

For example:
This house is big /br/br link img src house.png /br

I want to delete everything between the /br/br and the /br.

How would I write this query?

Answer 1

Try something like this:

update t
set s = concat (
        substr(s, 1, locate('/br/br', s) + 5),
        substr(s, length(s) - locate('rb/', reverse(s)) - 1)
        )
where s like '%/br/br%br%';

Used locate to find the index of the point to find substrings and then use concat to join the desired parts together.

It deletes everything between first /br/br and last /br