Cannot drop tablespace

Question

I cannot drop the tablespace create earlier today by me. The tablespace have 2 files and they are empty. Here is the case.
Thansk a lot,mj
SQL> select tablespace_name from dba_tablespaces;
TABLESPACE_NAME
SYSTEM
UNDOTBS1
SYSAUX
TEMP
ADDR_IX2
CFG_DATA
CFG_IX
TS_ATTR_IX
TS_Nums_DT
TS_NAME_DT
TS_INSERT_ONLY_DT
11 rows selected.
Elapsed: 00:00:00.01
SQL> drop tablespace TS_Nums_DT INCLUDING CONTENTS and datafiles;
drop tablespace TS_Nums_DT INCLUDING CONTENTS and datafiles
ERROR at line 1:
ORA-00959: tablespace 'TS_NUMS_DT' does not exist

Answer 1

As Aron says, there may be other, non-printing, characters in the name. You can check this by running:
SELECT DUMP(tablespace_name)
FROM dba_tablespaces
WHERE tablespace_name like 'TS\_N%' ESCAPE '\'Which will give you the ascii values of the characters in the tablespace name like this:
SQL> SELECT DUMP(tablespace_name)
  2  FROM dba_tablespaces
  3  WHERE tablespace_name = 'ONECALL';
DUMP(TABLESPACE_NAME)
Typ=1 Len=7: 79,78,69,67,65,76,76
              O  N  E  C  A  L  LHTH
John