In what condition must be used CHARTOROWID

Hi all
I don't understand why we need to function CHARTOROWID.

When I do this:
SQL> select rowid, chartorowid(rowid) test from employees where employee_id=100;


ROWID                         TEST
------------------                 ------------------
AAADYiAABAAAKb6AAA AAADYiAABAAAKb6AAA

SQL> select first_name from employees where rowid='AAADYiAABAAAKb6AAA';

FIRST_NAME
--------------------
Steven

SQL> select first_name from employees where rowid=chartorowid('AAADYiAABAAAKb6AAA');

FIRST_NAME
--------------------
Steven
I can still query the line without the function... then what is the function for?

Best regards
Valerie

You can use the data type implicit conversion - let the figure of SQL engine which must be converted and how (formatted for use).

Or you can use type conversion of explicit data - where your code provides for the conversion to be carried out and understand the rules and the formatting for this conversion. It is usually the safest and most reliable option.

Thus, when you perform the following steps:
Select first_name from employees where rowid = "AAADYiAABAAAKb6AAA";

Oracle must implicitly convert this string you provided to a rowid data type.

When you follow these steps:
Select first_name from employees where rowid = CharToRowId ('AAADYiAABAAAKb6AAA');

You are teaching to the Oracle to explicitly convert this string to a rowid data type.

Always consider as a rule of thumb, using explicit conversions - as implicit conversions may depend on internal settings (session) and can convert differently from what you assume.

Tags: Database

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