All Oracle Error Codes
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Frequent Oracle Errors

TNS:could not resolve the connect identifier specified
Backtrace message unwound by exceptions
invalid identifier
PL/SQL compilation error
internal error
missing expression
table or view does not exist
end-of-file on communication channel
TNS:listener unknown in connect descriptor
insufficient privileges
PL/SQL: numeric or value error string
TNS:protocol adapter error
ORACLE not available
target host or object does not exist
invalid number
unable to allocate string bytes of shared memory
resource busy and acquire with NOWAIT specified
error occurred at recursive SQL level string
ORACLE initialization or shutdown in progress
archiver error. Connect internal only, until freed
snapshot too old
unable to extend temp segment by string in tablespace
Credential retrieval failed
missing or invalid option
invalid username/password; logon denied
unable to create INITIAL extent for segment
out of process memory when trying to allocate string bytes
shared memory realm does not exist
cannot insert NULL
TNS:unable to connect to destination
remote database not found ora-02019
exception encountered: core dump
inconsistent datatypes
no data found
TNS:operation timed out
PL/SQL: could not find program
existing state of packages has been discarded
maximum number of processes exceeded
error signaled in parallel query server
ORACLE instance terminated. Disconnection forced
TNS:packet writer failure
see ORA-12699
missing right parenthesis
name is already used by an existing object
cannot identify/lock data file
invalid file operation
quoted string not properly terminated

to_number question

Stephen Lee



OK folks. I've slammed this around every which way I can think of.

Two columns of a table are char(18) and contain 13, 15, or 16 numeric
digits. The digits are KNOWN to be strictly numeric (except for the padding
out to 18 characters).
I can select:
 to_number(COLUMN) OK
 to_number(trim(COLUMN) OK
 to_number(COLUMN A) - to_number(COLUMN B) OK
 to_number(COLUMN A) - 12345 OK

But if I try something like
select yadayada from table where 123 < {any of the above number conversions)

I get ORA-01722: invalid number
with the * under the number conversion in the where clause.

Generally, if I try ANY kind of comparison or arithmetic operation in the
WHERE clause, I get the error.
While I can: select to_number(COLUMN A) - to_number(COLUMN B) OK
I cannot do: WHERE to_number(COLUMN A) - to_number(COLUMN B) > 0;

I've tried fiddling with format specifiers in the TO_NUMBER function. The
TO_NUMBER section of the O'Reilly PL/SQL Programming sheds no light on the
problem. Might there be someone amongst the learned out there who can?
(The version is

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