How to get the number of rows of the selected result from sqlite3?

Question

I want to get the number of selected rows as well as the selected data. At the present I have to use two sql statements:

one is

select * from XXX w         


        

Answer 1

For those who are still looking for another method, the more elegant one I found to get the total of row was to use a CTE. this ensure that the count is only calculated once :

WITH cnt(total) as (SELECT COUNT(*) from xxx) select * from xxx,cnt

the only drawback is if a WHERE clause is needed, it should be applied in both main query and CTE query.

In the first comment, Alttag said that there is no issue to run 2 queries. I don't agree with that unless both are part of a unique transaction. If not, the source table can be altered between the 2 queries by any INSERT or DELETE from another thread/process. In such case, the count value might be wrong.