在SQL查询中返回@@ rowcount结果

Question

I wanted to raiserror if exists and then print the number of rows that are matching .But this doesnt work . Please help .

if exists (select * from [rto] a
     inner join rt b
     on a.NUM=b.TABLE_NAME
     where a.START_YEAR between b.YEAR_START and b.YEAR_STOP)
     Raiserror ('Matched recs found',16,1)
     print 'There are' +  cast(@@rowcount as varchar(20)) + 'matched rows'

Answer 1

You missed BEGIN and END :

if exists (select * from [rto] a
    inner join rt b
    on a.NUM=b.TABLE_NAME
    where a.START_YEAR between b.YEAR_START and b.YEAR_STOP)
BEGIN
    Raiserror ('Matched recs found',16,1)
    print 'There are ' +  cast(@@rowcount as varchar(20)) + ' matched rows'
END

Answer 2

This is an alternative to your original post...not sure if you have specific requirements, but this should get you the error output that you desire:

DECLARE @rowcount INT
SET @rowcount = (select COUNT(*) from [rto] a
    inner join rt b
    on a.NUM=b.TABLE_NAME
    where a.START_YEAR between b.YEAR_START and b.YEAR_STOP)
IF @rowcount > 0
BEGIN
    Raiserror ('Matched recs found',16,1)
    print 'There are ' +  cast(@rowcount as varchar(20)) + ' matched rows'
END