About OCA question

Question

Hi guys,
i'm going to make the OCA exam next month.
If a question like this appear, what would be the correct answer ?
Question: A table name can never be composed starting with number. Is it correct ?
what would be the correct answer, if we can have a table name with number, since this name is enclosed in double quotation marks ( " " ) ?
thanks

Answer 1

Hi,
For the exam, remember of the rules for nomination of tables and columns:
(1) Must be initiated by a letter
(2) Must have of 1 up to 30 characters
(3) Must only contains A..Z, a..z, 0..9, and special characters like _, $, # only
(4) Should not to be a private word of the Oracle
Take a look on these examples below:
SQL> create table order (cod number);
create table order (cod number)
ERROR at line 1:
ORA-00903: invalid table name
SQL> create table example (
  2  id# number primary key,
  3  order$ number not null,
  4  date_1 date default sysdate,
  5  column2 varchar2(5),
  6  "cust_id" number);
Table created.
SQL> desc example
Name                                      Null?    Type
ID#                                       NOT NULL NUMBER
ORDER$                                    NOT NULL NUMBER
DATE_1                                             DATE
COLUMN2                                            VARCHAR2(5)
cust_id                                            NUMBER
SQL> create table "hi! are you ok?" (cod number, "12345" number);
Table created.
SQL> desc "hi! are you ok?"
Name                                      Null?    Type
COD                                                NUMBER
12345                                              NUMBERNow, about "double quotes", I think that OCA exam just want to test whether you know about the rules for nomination of tables and columns.
Good Luck!
Cheers