Hi Alex,   Try escaping the single quotes in your WHERE clause by putting backslashes before them, like this: WHERE col1 IN (\'argument1\',\'argument2\',\'argument3\',\'argument4\',\'argument5\') This is necessary, because if you don't use the escape characters, then the first single quote mark inside the SELECT statement will be interpreted as the end of the quoted SELECT statement.    For more details, see our Coursera courses. In particular: this video covers this specific topic.   Ian ... View more