如何使用 TOP 检索查询的总行数

Question

我有一个 SQL Server 2008 查询

SELECT TOP 10 *
FROM T
WHERE ...
ORDER BY ...

我还想获得总行数。obious 方法是进行第二次查询

SELECT COUNT(*)
FROM T
WHERE ...
ORDER BY ...

有没有有效的方法？

谢谢

Answer 1

您想要第二次查询吗？

SELECT TOP 10
    *, foo.bar
FROM
    T
    CROSS JOIN
    (SELECT COUNT(*) AS bar FROM T WHERE ...) foo
WHERE
    ...
ORDER BY
    ...

或者

DECLARE @bar int
SELECT @bar = COUNT(*) AS bar FROM T WHERE ...
SELECT TOP 10
    *, @bar
FROM
    T
    CROSS JOIN
    (SELECT COUNT(*) AS bar FROM T WHERE ...) foo
WHERE
    ...
ORDER BY
    ...

或者（编辑：使用WITH）

WITH cTotal AS
(
    SELECT COUNT(*) AS bar FROM T WHERE ...)
)
SELECT TOP 10
    *, cTotal .bar
FROM
    T
WHERE
    ...
ORDER BY
    ...