Left outer join MYSQL returning duplicate rows - mysql

Question

I have this MYSQL Query:
select
sc.supplier,
sq.query_value,
sc.cnv_name as name,
sc.cnv_id,
sq.query_type_id,
qt.query_type_desc,
date_format(sq.query_date, '%d/%m/%Y') as query_date,
qs.query_status,
sq.sla_count,
sq.sla_state,
sq.assigned_to,
IfNull(teams.team_count, 0) team_count,
if(
sq.sla_state is null
OR sq.sla_state = '',
'',
if(
sq.sla_state = 0,
'Query Handler',
if(
sq.sla_state = 1,
'Team Leader',
if(
sq.sla_state = 2,
'Manager',
if(
sq.sla_state = 3,
'Senior Manager',
'Senior Manager (GSCOP BREACH)'
)
)
)
)
) as sla_state_desc,
if(
team_count <= 0
OR team_count is null,
'',
if(team_count > 1, '(multiple)', pt.team_desc)
) as team
from
supconversation sc
left outer join supconvers_querydtls sq on sq.cnv_id = sc.cnv_id
left outer join querytype qt on qt.query_type_id = sq.query_type_id
left outer join querystatus qs on qs.query_status_id = sq.query_status_id
left outer join (
select
count(*) team_count,
tu.user_id
from
teamusers tu,
supconvers_querydtls sq2
where
tu.user_id = sq2.assigned_to
) teams on (teams.user_id = sq.assigned_to)
left outer join teamusers tu on tu.user_id = sq.assigned_to
left outer join portalteam pt on pt.team_id = tu.team_id
where
sc.supplier = 'SUPTEST1'
and sc.cnv_type = 'Q'
order by
query_date desc
What I am trying to do is check if a user has a record in teamusers. The user can be a part of more than 1 team. This is stored in the teamusers table with the columns team_id, user_id. If a user has more than 1 record in teamusers then return team value as (multiple). Otherwise, return the team_desc found in the portalteam table. The portalteam table consists of the columns team_id,team_desc.
This query seems to work but it's returning duplicate rows. I imagine this is because there are multiple records for some users in teamusers. How would I go about fixing this issue?

Answer 1

If you really get duplicated rows then you could try using a select DISTINCT
select distinct
sc.supplier,
sq.query_value,
sc.cnv_name as name,
sc.cnv_id,
sq.query_type_id,
qt.query_type_desc,
date_format(sq.query_date, '%d/%m/%Y') as query_date,
qs.query_status,
sq.sla_count,
sq.sla_state,
sq.assigned_to,
IfNull(teams.team_count, 0) team_count,
if(
sq.sla_state is null
OR sq.sla_state = '',
'',
if(
sq.sla_state = 0,
'Query Handler',
if(
sq.sla_state = 1,
'Team Leader',
if(
sq.sla_state = 2,
'Manager',
if(
sq.sla_state = 3,
'Senior Manager',
'Senior Manager (GSCOP BREACH)'
)
)
)
)
) as sla_state_desc,
if(
team_count <= 0
OR team_count is null,
'',
if(team_count > 1, '(multiple)', pt.team_desc)
) as team
from
supconversation sc
.....
.....