Question

I have a SqlServer SELECT

DECLARE @offset INT;
DECLARE @limit INT;

WITH cte
     AS (SELECT t.*,
                Row_number() OVER (ORDER BY Id) AS RowNum
         FROM   (SELECT *
                 FROM   Table1
                 UNION
                 SELECT *
                 FROM   Table2) t)
SELECT *
FROM   cte
WHERE  RowNum BETWEEN @offset AND @offset + @limit

How can I know the total of rows limited without the WHERE condition RowNum BETWEEN @offset AND @offset + @limit

Answer 1

You might add count(*) over() to cte:

WITH cte
     AS (SELECT t.*,
                Row_number() OVER (ORDER BY Id) AS RowNum,
                count(*) over() as Cnt
         FROM   (SELECT *
                 FROM   Table1
                 UNION
                 SELECT *
                 FROM   Table2) t)
SELECT *
FROM   cte
WHERE  RowNum BETWEEN @offset AND @offset + @limit