Best way to search for a value in the table
Hello worldNeed help to decide which application should be used in the following scenario.
Table temp_a
( col_1 varchar2(20),
status_flag varchar2(10)
);
col_1 is the primary keyI want to know if a given value is present in "col_1" of the table "temp_a.
So what query wud be faster:
1.
select count (*)
from temp_a
where col_1 = v_col_1 -- using variable to check for value
and status_flag ='active' ;
2.
select count (*)
from temp_a
where col_1 = v_col_1 -- using variable to check for value
and status_flag ='active'
and rownum =1 ;
Here, I am not concerned about the number (*), I just need to check if the v_col_1 is present or not.1. then please let me know, if both are one and the same. or one of them is faster over another.
2. also, is there a better way to check?
Thank you
Abhishek
The two approaches are the same, because col_1 is a primary key.
I think that there is a query then faster:
select count (*)
from temp_a
where col_1 = v_col_1
;
Max
[My Italian blog Oracle | http://oracleitalia.wordpress.com/2010/02/07/aggiornare-una-tabella-con-listruzione-merge/]
Tags: Database
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