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• ## ORA-01722 Invalid Number

千次阅读 2010-05-31 23:45:00
What causes this error? This problem occurs when an attempt is made to convert a character string into a number, and ... Valid numbers contain the digits '0' thru '9', with possibly one decim
What causes this error?This problem occurs when an attempt is made to convert a character string into a number, and the string cannot be
converted into a valid number. Valid numbers contain the digits '0' thru '9', with possibly one decimal point, a
sign (+ or -) at the beginning or end of the string, or an 'E' or 'e' (if it is a floating point number in
scientific notation). All other characters are forbidden.
There are numerous situations where this conversion may occur. A numeric column may be the object of an INSERT or an
UPDATE statement. Or, a numeric column may appear as part of a WHERE clause. It is even possible for this error to
appear when there are no numeric columns appearing explicitly in the statement! Here are some examples:
SQL> select to_number('3434,3333.000') from dual;ERROR:ORA-01722: invalid numberno rows selected
The above statement throws the error message, because it has found a character, in this case, a comma and the
default format for TO_NUMBER does not contain a comma.
The same error can occur when you use arithmetic functions on strings.
SQL> select 'abc' - 124 from dual;ERROR:ORA-01722: invalid numberno rows selected
The error can occur when you add dates with string values.
SQL> select '01-JUN-01' - 'abc' from dual;ERROR:ORA-01722: invalid numberno rows selected
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--------------------------------------------------------------------------------
How to fix itThe fix depends upon the exact expression which caused the problem. The following guide lists the possible SQL
expressions which can give this error, with their most likely cause. When addressing this error, keep in mind that
it can indicate a simple keystroke problem with the query, or a deeper problem with the query logic, or even the
presence of bad data in the database itself.
You are doing an INSERT INTO ... VALUES (...)  One of the data items you are trying to insert is an invalid number. Locate and correct it.
If all of the numbers appear to be valid, then you probably have your columns out of order, and an item in the
VALUES clause is being inserted into a NUMBER column instead of the expected VARCHAR2 column. This can happen when a
table has columns added or removed.
You are doing an INSERT or UPDATE, with a sub query supplying the values. Obviously, the preceding considerations apply here as well. What makes this more complicated is that the offending
character string is hidden as a row in a table. The fix is to identify the row (or rows) which has the non-numeric
string, and either change the data (if it is in error) or add something to the sub query to avoid selecting it. The
problem is in identifying the exact row.
Assuming that the errant datum is an alphabetic character, one can use the following query:
SELECT ...  WHERE UPPER(col) != LOWER(col)
where col is the column with the bad data.
You are doing a SELECT, rather than an INSERT or UPDATE. In this case, there is probably an implicit conversion happening between some predicate in the WHERE clause. Check
for a numeric column being compared to a character column.
If you are using the to_number function, make sure the format mask fits all possible character strings in the table.
If you know that a column contains both valid numbers and character strings, make sure that all rows which do not
contain valid numbers are being excluded in the WHERE clause.
Other Rare Situations To expand on the previous comment, if you have a column in a table which contains both valid numbers and character
strings, it is just barely possible to get an ORA-01722 even if no character strings are being returned by your
query. Example: two tables must be joined. In table A, the column is VARCHAR2, and in table B it is NUMBER. Table A
also has non-numeric data in that column in some rows, and has a type column to make it obvious which rows are
which. It is possible for the optimizer to choose an access plan in which the join is attempted before the
filtering, which will cause the ORA-01772. The fix is to add a hint which changes the plan enough to bypass the rows
causing the error.
Doing an explicit conversion can sometimes make things worse. For example, '+17', '-17', & ' 17' all convert
successfully implicitly. The last one will raise the error if the 'S99' mask is used in the to_number function.
A field containing only spaces will raise this error. One fix is to replace the spaces with nulls or zeroes.
If you are querying a view rather than a table, any of the above could apply, and be hidden from sight. The fix is
to add a predicate to the WHERE clause which excludes the troublesome rows. 
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