sql - ORA-01427: single-row subquery returns more than one row- multiple values needed -

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i have following sql query on oracle 

select    case     when (select distinct(trim(z.m_base_acct))       acc_mapping_rep z       z.m_dyn_acct=b.m_en_credit       , z.m_ref_data  =b.m_ref_data) in 'samanos'     '7200000888001x'    end m_en_crdr   acc_journal_rep b , b.m_ref_data       = 41091 , b.m_en_date        = '21-sep-15' , b.m_entity         = 'ln' , b.m_nb_trn         = 0

i having oracle error ora-01427. due line have case when condition knowing did put in operator instead of equal. please advise. need have multiple values in case condition.

if you've shown have 1 value compare, 'samanos', can swap terms:

select    case     when 'samanos' in (select distinct(trim(z.m_base_acct))       acc_mapping_rep z       z.m_dyn_acct=b.m_en_credit       , z.m_ref_data  =b.m_ref_data)     '7200000888001x'   end m_en_crdr ...

you left-join acc_mapping_rep table, distinct , trim worrying - if needed becomes little more complicated , you'd need left-join inline view of table.

the b.m_en_date = '21-sep-15' worrying; if m_en_date date column you're relying on implicit conversions , session nls settings. better use to_date(), or fixed value date literal: b.m_en_date = date '2015-09-21'.

your original longer code benefit using ansi joins instead of old oracle-specific (+) outer join operator.


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