At best we

Hello gurus,

I saw a lot of tables with column with the data type as char (1) / varchar2 (1) and I saw many procedures where a few local variables declared with char (1) / varchar2 (1) . And my question is which is the best char (1) or varchar2 (1) , kindly guide me.


Kind regards
Friend

I agree, that Oracle will treat empty string as a NULL value, but they are not the same.

NULL is unknown, while the empty string is not unknown.

For columns that contain NULL values, Oracle does not store NULL, but maybe an internal representation, designating the column contains an unknown value.

See this:

select dump(1), dump(null)
  from dual;

DUMP(1)            DUMP(NULL)
------------------ ----------
Typ=2 Len=2: 193,2 NULL 

Therefore, I agree that the NULL and empty strings are treated as NULL, but we shouldn't infer that they are the same.

Tags: Database

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