Adding to a column 10 options on PLSQL - oracle

Question

I want to add column but it should be 10 options to my database(PL/SQL).
My sql query is look like this:
ALTER TABLE mytable
ADD NEWCOL
Do you think that is it work?

Answer 1

I don't have to think, I know it won't work.
SQL> INSERT_INTO MYTABLE
2 (MYNEW_COL)
3 VALUES
4 (1,2,3,4,5,6,7,8,9,10);
INSERT_INTO MYTABLE
*
ERROR at line 1:
ORA-00900: invalid SQL statement
If you want to insert exactly those values, use a row generator:
SQL> insert into mytable (mynew_col)
2 select level from dual
3 connect by level <= 10;
10 rows created.
SQL> select * from mytable;
MYNEW_COL
----------
1
2
3
4
5
6
7
8
9
10
10 rows selected.
SQL>
Otherwise, discover other valid ways to do that, such as
SQL> insert into mytable (mynew_col)
2 select 1 from dual union all
3 select 2 from dual union all
4 select 3 from dual;
3 rows created.
or
SQL> insert all
2 into mytable (mynew_col) values (1)
3 into mytable (mynew_col) values (2)
4 into mytable (mynew_col) values (3)
5 select * from dual;
3 rows created.
SQL>
[EDIT] Ah, you turned the question upside down. If you want to add a new column and limit number of valid values, then:
SQL> alter table mytable add newcol number;
Table altered.
SQL> alter table mytable add constraint
2 ch_col check (newcol between 1 and 10);
Table altered.
Testing:
SQL> update mytable set newcol = 0;
update mytable set newcol = 0
*
ERROR at line 1:
ORA-02290: check constraint (SCOTT.CH_COL) violated
SQL> update mytable set newcol = 11;
update mytable set newcol = 11
*
ERROR at line 1:
ORA-02290: check constraint (SCOTT.CH_COL) violated
SQL> update mytable set newcol = 2;
16 rows updated.
SQL>