Doubt in view

i have table transaction with column transaction_time.
i want to create view for split the transaction_time column into 24 columns.i tried like this
create or replace view calender_view as select
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 1 and 2)one,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 2 and 3)two,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 3 and 4)three,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 4 and 5)four,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 5 and 6)five,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 6 and 7)six,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 7 and 8)seven,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 8 and 9)eight,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 9 and 10)nine,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 10 and 11)ten,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 11 and 12)eleven,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 12 and 13)twelve,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 13 and 14)thirteen,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 14 and 15)fourteen,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 15 and 16)fifteen,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 16 and 17)sixteen,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 17 and 18)seventeen,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 18 and 19)eighteen,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 19 and 20)ninteen,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 201 and 21)twenty,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 21 and 22)twentyone,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 22 and 23)twentytwo,
(select et_start_time from event_transaction where substr(et_start_time,1,2) between 23 and 24)twentythree
from event_transaction
View created.
SQL> select * from calender_view;
select * from calender_view
ERROR at line 1:
ORA-01427: single-row subquery returns more than one row
How to solve this problem.

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