框架式SQL查询的最大计数

Question

I have the query below that is selected data in a 'framed' manner. There is a lot of data and I only want to get one 'page' at a time.

SELECT
    entryDateTime,
    value
FROM
(
    SELECT
        ROW_NUMBER() OVER(ORDER BY entryDateTime DESC) AS rowNum,
        entryDateTime,
        value
    FROM
        table
    WHERE
        entryDateTime BETWEEN @start AND @end
) AS TempTbl
WHERE
    rowNum BETWEEN @startRow AND @endRow;

I want to know if it's possible to get the maximum rowNum value from this. Basically, I am looking to get a count of all possible rows so I know how many pages of data exist for the given time span (I expect the maximum rowNum to be bigger than @endRow ). Does anyone know how to do this?

Answer 1

通常，您将执行2个独立的查询，一个仅执行COUNT（*），然后执行一个独立的查询，以获取当前数据页。