: This is a comment operator that tells the database to ignore the rest of the code in that line.
This phrase appears to be a , specifically a technique used to test for vulnerabilities in a database. {KEYWORD}' ORDER BY 1364-- ygyW
: 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. : This is a comment operator that tells