[英]ORA-01858: a non-numeric character was found where a numeric was expected?
[英]ORA-01858: a non-numeric character was found where a numeric was expected - oracle 10g
我的问题是:对于每个会议,如果会议在2012年7月1日之前举行,则显示会议标题和“第一学期”字样,如果会议在2012年7月1日或之后举行,则显示“第二学期”字样。 对于包含“第一学期”或“第二学期”字样的专栏,请填写标题术语。 与之关联的表是
CONFID TITLE LOCATION SDATE
------ -------------------- -------------------- ---------
c00001 Hydroinformatics Singapore 15-JUN-12
c00002 Ecological_modeling Berlin 15-JUL-12
c00003 Computational_M London 25-MAY-12
c00004 Ecoinformatics Boston 22-AUG-12
c00005 Uncertainty_analysis Athens 10-OCT-12
c00006 Large_databases Toronto 13-APR-12
c00007 Systems_analysis Boston 23-MAR-12
c00008 Systems_integration Tokyo 24-FEB-12
c00009 Aquatic_biology Helsinki 12-MAY-12
c00010 Information_systems Paris 08-JAN-12
c00011 Simulation_modeling Rome 01-SEP-12
c00012 DSS Melbourne 18-DEC-12
我写的sql语句是:
select C.Title, 'First term' as "Term"
from Conference_C C
where C.ConfID in (select C.Sdate
from Conference_C C
where C.Sdate < '1-July-12')
union
select C.Title, 'Second term' as "Term"
from Conference_C C
where C.ConfID in (select C.Sdate
from Conference_C C
where C.Sdate >= '1-July-12');
我收到以下错误:
select C.Title, 'First term' as "Term" from Conference_C C where C.ConfID
*
ERROR at line 1:
ORA-01858: a non-numeric character was found where a numeric was expected
请澄清我哪里出错了,任何帮助将不胜感激。 谢谢
您正在将ConfID
(数字)与从内部查询返回的Sdate
(日期)进行比较:
where C.ConfID in (select C.Sdate
from Conference_C C
where C.Sdate < '1-July-12')
您只需要一个像这样的简单SQL:
select C.Title, 'First term' as "Term"
from Conference_C C
where C.Sdate < '1-July-12'
union
select C.Title, 'Second term' as "Term"
from Conference_C C
where C.Sdate >= '1-July-12'
还由于两个部分union
是互斥的,一个union all
可以使用(其执行更好,因为它不必消除重复)
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