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Notice: Undefined index: clase in C:\Apache24\htdocs\real\admin\reganuint.php on line 72

Fatal error: Uncaught PDOException: SQLSTATE[42000]: [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Incorrect syntax near '='. in C:\Apache24\htdocs\real\admin\reganuint.php:87 Stack trace: #0 C:\Apache24\htdocs\real\admin\reganuint.php(87): PDOStatement->execute() #1 {main} thrown in C:\Apache24\htdocs\real\admin\reganuint.php on line 87