: This is likely a random string used as a unique "fingerprint" to identify if the injection was successful in a scan report.
: This tells a database to sort results by the 1,364th column. Since most tables don't have that many columns, an error message often reveals information about the database structure.
If you found this in a web log or a security report, it indicates that an automated scanner or a user was testing a website for security flaws.
This phrase appears to be a , specifically a technique used to test for vulnerabilities in a database.
: This is a comment operator that tells the database to ignore the rest of the code in that line.