Invalid Number Error in Merge Statement

Question

Hi all.
I got an invalid number error in the following merge statement, but I don't know why. Maybe you can give me a hint.
MERGE INTO wam_table
USING (SELECT * FROM wam_table) b
ON (b.username = 'user'
AND b.mod = 'module'
AND b.trimester = '1')
WHEN MATCHED THEN
UPDATE SET as = '1', ad = '1', co = '1', pr = '1', date = localtimestamp, lus = 'username'
WHEN NOT MATCHED THEN
INSERT VALUES ('user','module','1','1','1','1','1', localtimestamp, 'username');
The invalid number error appears in the first line, but I don't know why?
Stephan

Answer 1

UPDATE SET as = '1', ad = '1', co = '1', pr = '1', date = localtimestamp, lus = 'username'SELECT * FROM sys.v_$reserved_words;
SQL> create table test1(as varchar2(10));
create table test1(as varchar2(10))
ERROR at line 1:
ORA-00904: : invalid identifier
SQL> create table test1(sno number, date date);
create table test1(sno number, date date)
ERROR at line 1:
ORA-00904: : invalid identifier
SQL> create table test1("as" varchar2(10));
Table created.
SQL>
SQL> create table test2(sno number, "date" date);
Table created.
SQL> desc test1
Name                                      Null?    Type
as                                                 VARCHAR2(10)
SQL> desc test2
Name                                      Null?    Type
SNO                                                NUMBER
date                                               DATE
SQL>