oracle - ORA-00932: inconsistent datatypes: expected CHAR got NUMBER while adding 1 to a date -

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probably silly mistake, couldn't figure out myself. when run query in oracle 11g.

if question answered in so, please let me know link.

with last_business_day (select decode(to_char(last_day(to_date('29-mar-2013')), 'd'),                                    , '7', to_char((last_day('29-mar-2013') - 1), 'dd-mon-yyyy')                                   , '1', to_char((last_day('29-mar-2013') - 2), 'dd-mon-yyyy')                                   , to_char(last_day('29-apr-2013'), 'dd-mon-yyyy')) last_bd dual),       holidays (select distinct rpt_day                      rpt_days rpt left join                           calendars cal on rpt.calendar_id = cal.calendar_id                     rpt.type = 2                        , cal.group = 4)   select case when to_char(to_date(last_bd, 'dd-mon-yyyy'), 'd') null               last_bd               else decode(to_char(to_date(last_bd, 'dd-mon-yyyy') , 'd')                           , '6', last_bd                           , '2', last_bd                           , last_bd)          end last_bd_of_month     last_business_day lbd           inner join holidays h on lbd.last_bd = h.rpt_day

i result 

last_bd_of_month =================== 29-mar-2013

now, when try add day last_bd date, throws error.

with last_business_day (select decode(to_char(last_day(to_date('29-mar-2013')), 'd'),                                    , '7', to_char((last_day('29-mar-2013') - 1), 'dd-mon-yyyy')                                   , '1', to_char((last_day('29-mar-2013') - 2), 'dd-mon-yyyy')                                   , to_char(last_day('29-apr-2013'), 'dd-mon-yyyy')) last_bd dual),       holidays (select distinct rpt_day                      rpt_days rpt left join                           calendars cal on rpt.calendar_id = cal.calendar_id                     rpt.type = 2                        , cal.group = 4)   select case when to_char(to_date(last_bd, 'dd-mon-yyyy'), 'd') null               last_bd               else decode(to_char(to_date(last_bd, 'dd-mon-yyyy') , 'd') -- line 35                           , '6', last_bd - 1 -- changed                           , '2', last_bd + 1 -- changed                           , last_bd)          end last_bd_of_month     last_business_day lbd           inner join holidays h on lbd.last_bd = h.rpt_day

error message

ora-00932: inconsistent datatypes: expected char got number
00932. 00000 - "inconsistent datatypes: expected %s got %s" *cause:
*action: error @ line: 35 column: 20

as said, might simple overlook side. tried converting last_bd date, didn't work.

i tried changing decode below

case when to_char(to_date(last_bd, 'dd-mon-yyyy'), 'd') null      last_bd      else decode(to_char(to_date(last_bd, 'dd-mon-yyyy') , 'd')                  , '6', to_date(last_bd, 'dd-mon-yyyy') - 1                  , '2', last_bd + 1 -- line 37                  , last_bd) end last_bd_of_month

and got error :

ora-00932: inconsistent datatypes: expected date got number
00932. 00000 - "inconsistent datatypes: expected %s got %s" *cause:
*action: error @ line: 37 column: 42

so, changed line 37 this, 

case when to_char(to_date(last_bd, 'dd-mon-yyyy'), 'd') null      last_bd      else decode(to_char(to_date(last_bd, 'dd-mon-yyyy') , 'd')                 , '6', to_date(last_bd, 'dd-mon-yyyy') - 1                 , '2', to_date(last_bd, 'dd-mon-yyyy') + 1                 , last_bd) end last_bd_of_month

and time different message.

ora-00932: inconsistent datatypes: expected char got date
00932. 00000 - "inconsistent datatypes: expected %s got %s" *cause:
*action: error @ line: 35 column: 20

any corrected appreciated.

answer : 

with last_business_day (select decode(to_char(last_day(to_date('29-mar-2013')), 'd'),                                    , '7', to_char((last_day('29-mar-2013') - 1), 'dd-mon-yyyy')                                   , '1', to_char((last_day('29-mar-2013') - 2), 'dd-mon-yyyy')                                   , to_char(last_day('29-apr-2013'), 'dd-mon-yyyy')) last_bd dual),       holidays (select distinct rpt_day                      rpt_days rpt left join                           calendars cal on rpt.calendar_id = cal.calendar_id                     rpt.type = 2                        , cal.group = 4)   select case when to_char(to_date(last_bd, 'dd-mon-yyyy'), 'd') null               last_bd               else decode(to_char(to_date(last_bd, 'dd-mon-yyyy') , 'd')                           , '6', to_char (to_date(last_bd, 'dd-mon-yyyy') - 1, 'dd-mon-yyyy')                           , '2', to_char (to_date(last_bd, 'dd-mon-yyyy') + 1, 'dd-mon-yyyy')                           , last_bd)          end last_bd_of_month     last_business_day lbd           inner join holidays h on lbd.last_bd = h.rpt_day

so see right, converted last_bdfrom varchar2 date (due to):

to_date(last_bd, 'dd-mon-yyyy')

in second query try subtract 1 varchar2:

last_bd - 1

this won't work. consequence error:

ora-00932: inconsistent datatypes: expected char got number

what work is, if convert date, add 1 , convert varchar2

with last_business_day (select decode(to_char(last_day(to_date('29-mar-2013')), 'd'),                                    , '7', to_char((last_day('29-mar-2013') - 1), 'dd-mon-yyyy')                                   , '1', to_char((last_day('29-mar-2013') - 2), 'dd-mon-yyyy')                                   , to_char(last_day('29-apr-2013'), 'dd-mon-yyyy')) last_bd dual),       holidays (select distinct rpt_day                      rpt_days rpt left join                           calendars cal on rpt.calendar_id = cal.calendar_id                     rpt.type = 2                        , cal.group = 4)   select case when to_char(to_date(last_bd, 'dd-mon-yyyy'), 'd') null               last_bd               else decode(to_char(to_date(last_bd, 'dd-mon-yyyy') , 'd') -- line 35                      , '6', to_char (to_date(last_bd, 'dd-mon-yyyy') - 1, 'dd-mon-yyyy')                       , '2', to_char (to_date(last_bd, 'dd-mon-yyyy') + 1, 'dd-mon-yyyy')                            , last_bd)          end last_bd_of_month     last_business_day lbd           inner join holidays h on lbd.last_bd = h.rpt_day

note conversion varchar2 required, because decode allows values of 1 type.


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