It’s very noisy and easily caught by modern Web Application Firewalls (WAFs) . Most systems today would flag this immediately as a malicious pattern.
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It’s a reliable way to find the "column count" without crashing the application immediately. The use of # at the end is a clever way to comment out the rest of the original code so it doesn't interfere with the injection.
Rating: ⭐⭐⭐☆☆ (Effective but Basic)
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