For this SAMPLES how to complete my obligation?

For this SAMPLES how to complete my obligation?
with the temp as
(
Select "LUN" weekdays, 9-10' TIMING 'I' of the CLASS OF THE DOUBLE UNION
Select "LUN" weekdays, 9-10' TIMING, 'II' CLASS OF DOUBLE UNION
Select "LUN" weekdays, 9-10' TIMING, 'III' CLASS OF DOUBLE UNION
Select "LUN" in WEEK 10-11' SCHEDULE, 'I' of the CLASS of THE DOUBLE UNION
Select "LUN" day of the WEEK, CALENDAR 10-11', 'II' CLASS OF DOUBLE UNION
Select "Mar" day of the WEEK, 9-10' TIMING, 'I' of the CLASS of THE DOUBLE UNION
Select "Mar" in WEEK 9-10' TIMING, 'II' FROM DUAL CLASS
)
Select? (what will be the query?)

How can I get output in this way:
day of the WEEK CALENDAR CLASS
MON 9-10 I, II, III
MON 10-11 I, II
MAR 9-10 I, II

In the case of 11 g, you can use LISTAGG

with temp as
(
select 'MON' WEEKDAY,'9-10' TIMING,'I' CLASS FROM DUAL UNION
select 'MON' WEEKDAY,'9-10' TIMING,'II' CLASS FROM DUAL UNION
select 'MON' WEEKDAY,'9-10' TIMING,'III' CLASS FROM DUAL UNION
select 'MON' WEEKDAY,'10-11' TIMING,'I' CLASS FROM DUAL UNION
select 'MON' WEEKDAY,'10-11' TIMING,'II' CLASS FROM DUAL UNION
select 'TUE' WEEKDAY,'9-10' TIMING,'I' CLASS FROM DUAL UNION
select 'TUE' WEEKDAY,'9-10' TIMING,'II' CLASS FROM DUAL
)
select
WEEKDAY,
TIMING,
LISTAGG(CLASS,',') WITHIN GROUP (order by 1) as class_aggregate
from temp
GROUP by WEEKDAY,TIMING;

WEEKDAY       TIMING     CLASS_AGGREGATE
------------- ---------- --------------------
MON           9-10       I,II,III
MON           10-11      I,II
TUE           9-10       I,II

Other techniques for the different versions are also mentioned here:
http://www.Oracle-base.com/articles/Misc/StringAggregationTechniques.php#listagg

Tags: Database

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