Get the record count

Question

The Query below is part of a huge query. The snipet is just the part that I need to make a change.
For the query below, how can I get the recordcount in the select inside the case statement? I want to only output the r_text when the record count of the select is zero (0) else make the output to r_text null
select
distinct a.style_id, b.sty, b.season, a.cust, a.ad_d, b.code,
(case when b.code = 'MAKE' then
(select min(t.value) from sn.age r, sn.text t
where r.t_id = '18' and r.name = 'MTGNSL'
     and r.t_id = t.t_id
     and r.name = t.name and r.text_id = t.text_id
     and r.id_1 = a.id
) end) r_text,
(case when b.code is null then 'Blank Code'
when b.code = 'MAKE' then 'MAKE' end) err
     

Answer 1

If you are not using a scrollable result set then the following is the best way to do it.
there are several key words in SQL that can be used, the one you are interested in is count();
so if your query at the moment is
"select col1, col2, col3 from my_table where col2=? and col3=?"you can work out how many rows will be returned by executing this command first
"select count(col1) from my_table where col2=? and col3=?"this will return a result set with one row and one column, you can get the row count as follows:
ResultSet rs = ps.executeQuery();
int rowCount = rs.getInt(1);I hope this helps :)