what does count(1) do?

[RaviRajhulk]

If there is a code like
SELECT count(1) from TABLE Where condition1=cond ition2;
Is count(1) same as count(*)?
Does count(1) counts the first column of the table?

[amitpatel66]

COUNT(1) improves the query performance compared to COUNT(*). So in case if you have any primary key column then using that for the COUNT will improve the performance.