sql - single-row subquery returns more than one row in Redshift when I try to use CASE in UPDATE -


i trying use case statement sub query in update statement facing issue

single-row sub query returns more than

please find query tried 

update r_gl.ac set meeting_cost = case currency_code when 'ind'                    amount                    else round(tgt.amount) r_gl.ac tgt  join (     select distinct         a.frm_cur,         a.to_cur,         a.exch_rate     b_gl.currncy_conv_dim       join r_gl.ac b         on (a.frm_cur = 123 , a.to_cur = b.cur_cd  , f_rate = 'abc')      join b_gl.int_fg         on b.in_s=c.in_s , a.cal_sk = trunc(c.intact_dt_key,-2) ) src     on tgt.cur_cd=src.to_cur ) end

please me solve issue

your current case expression missing end. aside, see bigger problems update statement. redshift based on old version of postgres, , hence expect adhere same syntax postgres use update join:

update table1 t1 set some_column = t2.some_other_column table2 t2 t1.id = t2.id

applying syntax current query along fix case expression leaves following:

update r_gl.ac tgt set meeting_cost = case when currency_code = 'ind'                    tgt.amount                    else round(tgt.amount) end (     select distinct         a.frm_cur,         a.to_cur,         a.exch_rate     b_gl.currncy_conv_dim       inner join r_gl.ac b         on (a.frm_cur = 123 , a.to_cur = b.cur_cd  , f_rate = 'abc')      inner join b_gl.int_fg         on b.in_s=c.in_s , a.cal_sk = trunc(c.intact_dt_key,-2) ) src tgt.cur_cd = src.to_cur

the table joining r_gl.ac has no effect on data being used update, rather affect update targeting rows. if not intended logic, might have rethink entire query.


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