Question

我有一张类似的桌子

<div class="home-media-content col-sm-3 px-1 pb-2">
    <div class="embed-responsive embed-responsive-16by9">

        <?php

        $my_query = new WP_Query(
            array(
                'post_status' => 'publish',
                'post_type'   => 'page',
            )
        );


        if ( $my_query->have_posts() ) {
            while ( $my_query->have_posts() ) {
                $my_query->the_post();

                  the_title(); // Posting just for the test

                if ( get_page_template() === 'media-template.php' ) { // This needs to be the file slug rather than template name
                      do_something();
                } else {
                        do_something_else();
                }
            }
        }

            wp_reset_postdata(); // Reset postdata back to normal

        ?>


    </div>
</div>

我需要一种SQL方式来在类型1的行之间选择类型2的行，并传递一行ID

示例：

ID | Type
---------
1  | 1
2  | 2
3  | 2
4  | 2
5  | 1
6  | 2
7  | 2

预先感谢您的帮助

Answer 1

这是一种方法：

select t.*
from t
where t.id > 5 and
      t.type = 2 and
      t.id < coalesce( (select min(t2.id)
                        from t t2
                        where t2.id > 5 and
                              t2.type = 1
                       ), 999999999
                     );

或更优雅：

select t.*
from t
where t.id > 5 and
      t.type = 2 and
      t.id < all (select t2.id
                  from t t2
                  where t2.id > 5 and
                        t2.type = 1
                 );

Answer 2

这是一个可能的选择。

CREATE TABLE SampleData(
    ID int, 
    Type int);
INSERT INTO SampleData
VALUES
(1, 1),
(2, 2),
(3, 2),
(4, 2),
(5, 1),
(6, 2),
(7, 2);
DECLARE @ID int =1;--Parameter

DECLARE @NextID int = (SELECT TOP 1 ID 
                       FROM SampleData 
                       WHERE ID > @ID 
                       AND Type = 1 
                       ORDER BY ID);

SELECT *
FROM SampleData
WHERE Type = 2
AND ID > @ID
AND (ID < @NextID OR @NextID IS NULL);

这将是有关如何创建内联表值函数的示例。

CREATE FUNCTION GetSubset(
    @ID int 
)
RETURNS TABLE
AS
RETURN 
    SELECT *
    FROM SampleData sd
    WHERE sd.Type = 2
    AND sd.ID > @ID
    AND sd.ID <= ISNULL((SELECT TOP 1 i.ID 
                       FROM SampleData i
                       WHERE i.ID > @ID 
                       AND i.Type = 1 
                       ORDER BY i.ID), sd.ID);

选择行顺序

2 个答案: