sql - What to modify in my query to fix literal format string error? -


literal not match format string 

select to_date(to_char(a.date,'dd/mm/yyyy') || to_char(a.time),'dd/mm/yyyy hh24:mi:ss')  dual , tab

how modify query not produce above error ?

a.time type varchar2(20) , a.date date

i have condition 

select to_date(to_char(a.date,'dd/mm/yyyy') || to_char(a.time),'dd/mm/yyyy hh24:mi:ss')  < to_date('20/04/2015','dd/mm/yyyy') +1 dual , tab

its producing error how modify it

try this

select to_date(to_char(a.date,'dd/mm/yyyy') || ' ' || a.time,'dd/mm/yyyy hh24:mi:ss')  dual , tab

this work if data in a.time column in format hh24:mi:ss. should use case-when deal boolean expressions in select list.

     select      case when to_date(to_char(a.date,'dd/mm/yyyy') ||          a.time,'dd/mm/yyyy hh24:mi:ss')               < (to_date('20/04/2015','dd/mm/yyyy') +1)      'y' else 'n' end    dual , tab

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