ORA-00932：不一致的数据类型：预期CHAR在为日期添加1时获得NUMBER
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可能是一个愚蠢的错误，但我自己无法弄清楚这一点。当我在Oracle 11g中运行此查询时。
如果在SO中回答了这个问题，请告诉我链接。
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
我得到了结果
LAST_BD_OF_MONTH
===================
29-MAR-2013
现在，当我尝试在LAST_BD日期添加一天时，它会抛出一个错误。
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
错误信息
ORA-00932：不一致的数据类型：预期CHAR得到NUMBER 00932. 00000 - “不一致的数据类型：预期％s得到％s”*原因： *动作：行错误：35列：20
正如我所说，这可能是我身边的一个简单的忽视。我尝试将LAST_BD转换为date，但没有奏效。
我尝试更改DECODE如下
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
并得到此错误：
ORA-00932：不一致的数据类型：预期DATE得到NUMBER 00932. 00000 - “不一致的数据类型：预期％s得到％s”*原因： *动作：行错误：37列：42
所以，我把line 37改成了这个，
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
而这次是一个不同的信息。
ORA-00932：不一致的数据类型：预期CHAR得到DATE 00932. 00000 - “不一致的数据类型：预期％s得到％s”*原因： *动作：行错误：35列：20
非常感谢任何帮助以纠正这一点。
答案：
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
所以我认为是正确的，你将LAST_BDfrom VARCHAR2转换为DATE（由于）：
to_date(LAST_BD, 'DD-MON-YYYY')
在第二个查询中，您尝试从此1中减去VARCHAR2：
LAST_BD - 1
这不行。结果你得到错误：
ORA-00932: inconsistent datatypes: expected CHAR got NUMBER
可能有用的是，如果你将它转换为DATE，添加1并将其转换回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
请注意，需要转换回VARCHAR2，因为DECODE只允许一种类型的值。
问题是DECODE期望某种CHAR参数和LAST_BD + 1甚至TO_DATE(LAST_BD...分别返回NUMBER和DATE。
以下SQL小提琴演示如何解决此问题。
http://sqlfiddle.com/#!4/8ac4a3/9
这是查询：
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
您必须使用TO_CHAR将数字或日期转换回CHAR。
似乎Oracle要求case结构所有then表达式的类型与第一个表达式之后的表达式类型一致。 不执行任何类型转换。
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