SQL字符串替换通配符

Question

I have a table X with column Y, that contains text like this:

Click <a href=""http://www.stackoverflow.com"">here</a> to redeem

I need it turned into:

Click <a href="http://www.stackoverflow.com">here</a> to redeem

ie. remove the extra pair of quotes

The text outside of the ""url"" may be anything.

Is it something like this?

Update X SET Y = REPLACE(Y, '""%""', '"%"' );

Answer 1

REPLACE用第3个参数替换第2个参数的所有出现：

update X set Y = replace(Y, '""', '"')

Answer 2

select replace('Click <a href=""http://www.stackoverflow.com"">here</a> to redeem','""','"')  

在实际进行更新之前，我使用select来检查更新的内容。

Answer 3

你需要用“”代替“，所以这样做：

Update X SET Y = REPLACE(Y, '""', '"')

Answer 4

You need to replace "" by ", so do it like this:

Update X SET Y = REPLACE(Y, '""', '"') WHERE y LIKE '""%""';

Use with a dose of caution, because it will also replace text like:

Click <a href="http://www.stackoverflow.com">""here""</a> to redeem

into

Click <a href="http://www.stackoverflow.com">"here"</a> to redeem