选择查询以删除Mysql中的这些字符

Question

SELECT * FROM mytablename WHERE sku = 'AZ-EFCQ-5' LIMIT 0 , 30

In MySQL table (description field) there are some weird characters in the database.There are almost 400+ records with all these characters out of 200,000 records it seems.

Example: The database record for one of the field shows the following when I run the query

Select * from mytablename where sku='az123'

Replacement for TOY TRAIN 746 N&W J   Replacement Light Bulb

But when I run the same query in PHP and print it, it shows

Replacement For TOY TRAIN 746 N&W JÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  Replacement Light Bulb

I tried using the following solution at

How can I find non-ASCII characters in MySQL?

This doesn't work, doesn't show any weird characters in Mysql, check the MySQL screenshot below

Answer 1

As further analysis in the chat has shown that there really is something broken concerning charset handling between the MySQL DB connection and the PHP process running, we came up with the following "solution":

SELECT replace(description, char(160), ' ') as description 
FROM dumpdata WHERE AZ_Code = 'AZ-EFK9-6' 

The hidden chars are in fact   s which somehow got introduced by an import process. As they do not carry any information, but are only disturbing, it was ok to just remove them by replacing them when reading the column (see SQL statement above). This isn't really the proper solution for the root cause - it feels more like a workaround. However, for the given purpose, it was considered to be sufficient.

NB for other readers who might have a similar issue: The DB connection is being driven by mysqli in object-oriented style. We tried to

$conn->set_charset('utf8')

and confirmed via conn->get_charset() that this also was successful. However, the problem with the wired chars still appeared. Moreover, we also tried an explicitly cast with

SELECT cast(description as char character set utf8) 
FROM dumpdata WHERE `AZ_Code` = 'AZ-EFK9-6'

but also this did not trigger a proper charset conversion.