Question

我有一个问题，我无法用MySQL的SQL查询解决。

第一张表＆＃34;内容＆＃34;

ID / Title / Author / Curated / Created

下一张表＆＃34;白名单＆＃34;

身份证/作者/体重

我想要SQL做的是选择所有内容WHERE content.created >= UNIX_TIMESTAMP(DATE_SUB(now(), INTERVAL 14 day))另外我还要为作者随机选择权重，这样高权重的作者会显示出更低的权重。至于现在我正在使用这个函数ORDER BY -LOG(RAND(1337)) / whitelist.weight ASC。最后，我希望每一行都被策划，而下一行则不是。

所以结果会是这样的。

ID  Title       Author      Curated     Created
3   My Home1    Krister     1           2015-01-20
13  My Home14   Krister     0           2015-01-20
33  My Home8    Eva         1           2015-01-15
34  My Home11   Krister     0           2015-01-01
43  My Home18   Eva         1           2015-01-01

我尝试过的......

SELECT *
FROM (
    SELECT `content`.*, IF(`content`.`curated`=0, @mr:=@mr+1, @fr:=@fr+1) AS cur
    FROM `content` INNER JOIN `whitelist` ON `content`.`author` = `whitelist`.`author` , (SELECT @mr:=0, @fr:=0) initvars
    WHERE
        content.is_deleted = 0 
        AND content.created >= UNIX_TIMESTAMP(DATE_SUB(now(), INTERVAL 14 day))
    ) tmp
INNER JOIN whitelist ON tmp.author = whitelist.author
ORDER BY cur ASC LIMIT 5 OFFSET 0;

Answer 1

试试这个：

SELECT * FROM content
JOIN whitelist ON content.Author = whitelist.Author
WHERE content.created >= UNIX_TIMESTAMP(DATE_SUB(now(), INTERVAL 14 day))
ORDER BY (RAND() * (SELECT MAX(Weight) FROM whitelist)) + Weight DESC

现在有策划：

SET @pos1=0;
SET @pos2=0;

SELECT * FROM 
(
    SELECT *, @pos1 := @pos1 + 1 pos FROM
    (
        SELECT Content.* FROM content
        JOIN whitelist ON content.Author = whitelist.Author
        WHERE curated = 0
        AND content.created >= UNIX_TIMESTAMP(DATE_SUB(now(), INTERVAL 14 day))
        ORDER BY (RAND() * (SELECT MAX(Weight) FROM whitelist)) + Weight 
    ) s1
    UNION
    SELECT *, @pos2 := @pos2 + 1 pos FROM
    (
        SELECT Content.* FROM content
        JOIN whitelist ON content.Author = whitelist.Author
        WHERE curated = 1
        AND content.created >= UNIX_TIMESTAMP(DATE_SUB(now(), INTERVAL 14 day))
        ORDER BY (RAND() * (SELECT MAX(Weight) FROM whitelist)) + Weight 
    ) s2
) t1
ORDER BY pos DESC, Curated

MySQL每隔一行就有重量

1 个答案: