Question

我有以下查询，它提取没有重复的随机行。

我的问题是，当我想为后续页面加载更多时，我该如何避免重复？

SELECT TOP ($limit) Min(c.id)           AS id, 
                    s.id                AS skid, 
                    s.name, 
                    Min(b.sector)       AS sector, 
                    Min(s.currency)     AS currency, 
                    Min(s.url)          AS url, 
                    Min(sd.description) AS description 
FROM   coupons AS c 
       INNER JOIN users AS s 
               ON c.USER = s.id 
       INNER JOIN business AS b 
               ON s.id = b.USER 
       LEFT JOIN groups AS g 
              ON g.couponid = c.id 
WHERE  ( c.[public] = 'True' ) 
       AND ( c.valid = 'True' ) 
       AND ( s.currency = '$curr' ) 
GROUP  BY s.id, 
          s.name 
ORDER  BY Newid()

非常感谢

Answer 1

您必须将返回的记录ID保存在数组中，并在加载新数据时将其作为参数发送。

如果只想用sql解决它，可以创建一个临时表来保存返回的记录ID。当您加载更多数据时，只需添加：

"SELECT TOP ($limit) Min(c.id)           AS id, 
                s.id                AS skid, 
                s.name, 
                Min(b.sector)       AS sector, 
                Min(s.currency)     AS currency, 
                Min(s.url)          AS url, 
                Min(sd.description) AS description 
FROM   coupons AS c 
   INNER JOIN users AS s 
           ON c.USER = s.id 
   INNER JOIN business AS b 
           ON s.id = b.USER 
   LEFT JOIN groups AS g 
          ON g.couponid = c.id 
WHERE  ( c.[public] = 'True' ) 
   AND ( c.valid = 'True' ) 
   AND ( s.currency = '$curr' ) 
   AND ( s.id NOT IN (SELECT id FROM temporary_table))
GROUP  BY s.id, 
      s.name 
ORDER  BY Newid()";

如果你被允许使用php而不是更容易。只需使用数组变量并在连接到加载页面时发布它。

"SELECT TOP ($limit) Min(c.id)           AS id, 
                s.id                AS skid, 
                s.name, 
                Min(b.sector)       AS sector, 
                Min(s.currency)     AS currency, 
                Min(s.url)          AS url, 
                Min(sd.description) AS description 
FROM   coupons AS c 
   INNER JOIN users AS s 
           ON c.USER = s.id 
   INNER JOIN business AS b 
           ON s.id = b.USER 
   LEFT JOIN groups AS g 
          ON g.couponid = c.id 
WHERE  ( c.[public] = 'True' ) 
   AND ( c.valid = 'True' ) 
   AND ( s.currency = '$curr' ) 
   AND ( s.id NOT IN (" . implode(',', $used_Ids) ."))
GROUP  BY s.id, 
      s.name 
ORDER  BY Newid()";

SQL Server - 批量选择随机行以进行页码编号，无需重复

1 个答案: