问题
Probably a silly mistake, but I couldn't figure this out myself. When I run this query in Oracle 11g.
If this question is answered in SO, please let me know the link.
with LAST_BUSINESS_DAY as (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')) as LAST_BD from dual),
HOLIDAYS as (select distinct rpt_day
from rpt_days rpt left join
calendars cal on rpt.calendar_id = cal.calendar_id
where rpt.type = 2
and cal.group = 4)
select case when to_char(to_date(LAST_BD, 'DD-MON-YYYY'), 'D') is null
then LAST_BD
else DECODE(to_char(to_date(LAST_BD, 'DD-MON-YYYY') , 'D')
, '6', LAST_BD
, '2', LAST_BD
, LAST_BD)
end as LAST_BD_OF_MONTH
from LAST_BUSINESS_DAY LBD
inner join HOLIDAYS H on LBD.LAST_BD = H.rpt_day
I get the result as
LAST_BD_OF_MONTH
===================
29-MAR-2013
Now, when I try to add a day to the LAST_BD date, it throws an error.
with LAST_BUSINESS_DAY as (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')) as LAST_BD from dual),
HOLIDAYS as (select distinct rpt_day
from rpt_days rpt left join
calendars cal on rpt.calendar_id = cal.calendar_id
where rpt.type = 2
and cal.group = 4)
select case when to_char(to_date(LAST_BD, 'DD-MON-YYYY'), 'D') is null
then LAST_BD
else DECODE(to_char(to_date(LAST_BD, 'DD-MON-YYYY') , 'D') -- line 35
, '6', LAST_BD - 1 -- CHANGED THIS
, '2', LAST_BD + 1 -- CHANGED THIS
, LAST_BD)
end as LAST_BD_OF_MONTH
from 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 at Line: 35 Column: 20
As I said, this might be a simple overlook from my side. I tried converting the LAST_BD to a date, but didn't work.
I tried changing the DECODE as below
case when to_char(to_date(LAST_BD, 'DD-MON-YYYY'), 'D') is null
then 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 as LAST_BD_OF_MONTH
and got this error :
ORA-00932: inconsistent datatypes: expected DATE got NUMBER
00932. 00000 - "inconsistent datatypes: expected %s got %s" *Cause:
*Action: Error at Line: 37 Column: 42
So, I changed the line 37 to this,
case when to_char(to_date(LAST_BD, 'DD-MON-YYYY'), 'D') is null
then 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 as LAST_BD_OF_MONTH
and this time its a different message.
ORA-00932: inconsistent datatypes: expected CHAR got DATE
00932. 00000 - "inconsistent datatypes: expected %s got %s" *Cause:
*Action: Error at Line: 35 Column: 20
Any help to get this corrected is greatly appreciated.
ANSWER :
with LAST_BUSINESS_DAY as (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')) as LAST_BD from dual),
HOLIDAYS as (select distinct rpt_day
from rpt_days rpt left join
calendars cal on rpt.calendar_id = cal.calendar_id
where rpt.type = 2
and cal.group = 4)
select case when to_char(to_date(LAST_BD, 'DD-MON-YYYY'), 'D') is null
then 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 as LAST_BD_OF_MONTH
from LAST_BUSINESS_DAY LBD
inner join HOLIDAYS H on LBD.LAST_BD = H.rpt_day
回答1:
So do I see it right, that you converted LAST_BDfrom VARCHAR2 to DATE (due to):
to_date(LAST_BD, 'DD-MON-YYYY')
In the second query you try to subtract 1 from this VARCHAR2:
LAST_BD - 1
This won't work. As a consequence you get the error:
ORA-00932: inconsistent datatypes: expected CHAR got NUMBER
What would probably work is, if you convert it to DATE, add 1 and convert it back to VARCHAR2
with LAST_BUSINESS_DAY as (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')) as LAST_BD from dual),
HOLIDAYS as (select distinct rpt_day
from rpt_days rpt left join
calendars cal on rpt.calendar_id = cal.calendar_id
where rpt.type = 2
and cal.group = 4)
select case when to_char(to_date(LAST_BD, 'DD-MON-YYYY'), 'D') is null
then 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 as LAST_BD_OF_MONTH
from LAST_BUSINESS_DAY LBD
inner join HOLIDAYS H on LBD.LAST_BD = H.rpt_day
Note that the conversion back to VARCHAR2 is required, because DECODE allows only values of one type.
回答2:
The issue is that DECODE expects a CHAR argument of some kind and LAST_BD + 1 and even the TO_DATE(LAST_BD... return a NUMBER and a DATE respectively.
The following SQL Fiddle demonstrate how to fix this.
http://sqlfiddle.com/#!4/8ac4a3/9
Here is the query:
with LAST_BUSINESS_DAY as (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')) as LAST_BD from dual),
HOLIDAYS as (select distinct reporting_day
from tbm_reporting_days trdy left join
tbm_calendars tcal on trdy.calendar_id = tcal.calendar_id
where trdy.type = 2
and tcal.site_id = 4)
select case when to_char(to_date(LAST_BD, 'DD-MON-YYYY'), 'D') is null
then 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), 'D')
, '2', TO_CHAR(
(TO_DATE(LAST_BD, 'DD-MON-YYYY') - 1), 'D')
, LAST_BD)
end as LAST_BD_OF_MONTH
from LAST_BUSINESS_DAY LBD
inner join HOLIDAYS H on LBD.LAST_BD = H.reporting_day
You have to convert the number or date back to a CHAR with TO_CHAR.
回答3:
It seems Oracle requires for case structures the type of all then expressions to be consistent with the type of the expression after the first then.
No type conversions are performed.
来源：https://stackoverflow.com/questions/29803977/ora-00932-inconsistent-datatypes-expected-char-got-number-while-adding-1-to-a