How many columns can be used in the SELECT Statment

Question

Hi all,
How many columns can be used in the SELECT statement?
Ex: SELECT x1,x2,....xn FROM <table_name>;
Thanks,
GowriShankar.N

Answer 1

Let me join ;-)
SQL> select * from v$version;
BANNER
Oracle9i Enterprise Edition Release 9.2.0.6.0 - Production
PL/SQL Release 9.2.0.6.0 - Production
CORE    9.2.0.6.0       Production
TNS for Linux: Version 9.2.0.6.0 - Production
NLSRTL Version 9.2.0.6.0 - Production
SQL> DECLARE
  2  l_sql varchar2(32000);
  3  begin
  4  l_sql := 'CREATE TABLE T(';
  5  for i in 1..999 loop
  6  l_sql := l_sql ||'C'||i||' NUMBER,
  7  ';
  8  end loop;
  9  l_sql := l_sql||'C1000 NUMBER)';
10  EXECUTE IMMEDIATE l_sql;
11  end;
12  /
PL/SQL procedure successfully completed.
SQL> select count(*) from cols where table_name = 'T';
  COUNT(*)
      1000
SQL> insert into t(c1) values(1);
1 row created.
SQL> select *
  2  from t t1,t t2;
        C1         C2         C3         C4         C5         C6         C7         C8         C9       
...   snipped
C991        C992       C993       C994       C995       C996       C997       C998       C999         C1         C2         C3       C4         C5         C6         C7         C8         C9        C10       
...   snipped
C990       C991       C992       C993    C994        C995       C996       C997       C998       C999
---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------          1
                                                                                                                                    1
SQL>
SQL> select count(*) from (
  2  select * from t t1,t t2)
  3  ;
select * from t t1,t t2)
ERROR at line 2:
ORA-01792: maximum number of columns in a table or view is 1000Obviously, inline view is obliged the same restrictions as a view, but select list is not constrained.
Best regards
Maxim