sql - Joining tables with different number of rows without duplicates -

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i have complicated sql statement creates table of users have rights connect, appuser, or both:

(select  b.grantee "username", a.granted_role "connect", b.granted_role "appuser"      (select grantee, granted_role dba_role_privs granted_role = 'connect')       right outer join      (select grantee, granted_role dba_role_privs granted_role = 'appuser') b      on a.grantee=b.grantee)  union  (select  a.grantee, a.granted_role, b.granted_role      (select grantee, granted_role dba_role_privs granted_role = 'connect')       left outer join      (select grantee, granted_role dba_role_privs granted_role = 'appuser') b      on a.grantee=b.grantee)

this produces like:

username        connect        appuser ---------      ---------      --------- sue             connect        appuser bob             (null)         appuser joe             connect        (null)

i wish use all_users table, show users have neither rights. all_users table shows every user in database.

i have tried adding several types of joins end of sql statement achieve this. closest got adding:

union (select username, null, null all_users)

this produce list each user shown twice, shows users without either right: 

username        connect        appuser ---------      ---------      --------- amy             (null)         (null) sue             connect        appuser sue             (null)         (null) bob             (null)         appuser bob             (null)         (null) joe             connect        (null) joe             (null)         (null)

i tried adding where username = a.grantee, won't work unions. if try replacing union joins, adding:

full outer join select username, null, null all_users  on username = a.grantee;

i error:

"sql command not ended"

your query seems way more complicated necessary. here 1 approach:

select grantee,        max(case when granted_role = 'connect' granted_role end) "connect",        max(case when granted_role = 'appuser' granted_role end) "appuser" dba_role_privs group grantee;

if there users have no roles @ all, need all_users table.

edit:

just use left join:

select au.username,        max(case when granted_role = 'connect' granted_role end) "connect",        max(case when granted_role = 'appuser' granted_role end) "appuser" all_users au join      dba_role_privs rp      on au.username = rp.grantee group au.username;

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