MySQL表左连接不匹配（MySQL，Python）

Question

SOLVED see comments and solution

I have 2 scrapers which store there scraped data in 2 SQL tables: cpu and cpubench .

cpu contains : name, price, id(this is not constant across scrapers), mark

cpubench contains : name, mark, cpurank

Here is a snippet from these tables:

cpu

name price id mark AMD Ryzen 5 2600 $259.00 jLF48d 0 Intel Core i7-8700K $573.74 sxDzK8 0 AMD Ryzen 7 2700X $449.69 bddxFT 0 Intel Core i5-8600K $396.39 Mr2rxr 0 AMD Ryzen 3 2200G $145.00 RkJtt6 0 Intel Core i9-9900K $829.61 jHZFf7 0 AMD Ryzen 5 2600X $300.00 6mm323 0 Intel Core i5-9600K $419.00 28qhP6 0 Intel Core i7-9700K $659.00 WtyV3C 0 AMD Ryzen 5 1600 $232.61 mV98TW 0

cpubench

name mark cpurank AMD Ryzen 5 2600 13527 160 Intel Core i7-8700K 15962 98 AMD Ryzen 7 2700X 16971 75 Intel Core i5-8600K 12786 175 AMD Ryzen 3 2200G 7325 503 Intel Core i9-9900K 20150 37 AMD Ryzen 5 2600X 14342 135 Intel Core i5-9600K 13498 162 Intel Core i7-9700K 17379 69 AMD Ryzen 5 1600 12264 187

Note:

All columns in both tables are VARCHAR(255) .

Tables are not in this exact order with names lining up perfectly.

I am using the following python code:

mycursor = mydb.cursor()

sql = ("SELECT cpu.id, cpu.name, cpu.price, cpubench.mark FROM cpu LEFT JOIN 
cpubench ON cpu.name = cpubench.name")

mycursor.execute(sql)

Which runs without error.

However all the mark values in cpu are null.

How can i troubleshoot/solve this problem?

Any help would be greatly appreciated.

Update

I have created a working SQL fiddle: https://www.db-fiddle.com/f/sngju1uUBNMF56eVVTYu6H/3

I have tried the code from the fiddle in python with it running but all cpu.mark values being null.

Thanks

Answer 1

AS per comments, am binding the final solution here:

update cpu 
join cpubench on UPPER(TRIM(cpu.`"name"`)) = UPPER(TRIM(cpubench.`"name"`)) 
set cpu.`"mark"` = cpubench.`"mark"`;

SELECT * FROM cpu;