Question

我正在尝试将唯一的术语计为总计数。

这是原始查询，工作正常

->select('DISTINCT search_tags.term AS t_name, nbr', FALSE)        
    ->from('search_tags LEFT JOIN (SELECT term AS tk, COUNT(search_tags.term) AS nbr FROM search_tags GROUP BY search_tags.term) AS TR ON search_tags.term = TR.tk ')
    ->where('search_tags.dt_added >=', '2011-08-01 09:48:54') 
    ->where('search_tags.dt_added <=', '2011-09-02 09:48:54');

// returns: [twitter,12],[facebook,6].....

问题是此代码运行数据表（datatable.net），因此数据表删除了选择行并将其更改为：

SELECT COUNT(*) AS numrows
FROM (search_tags LEFT JOIN (SELECT term AS tk, COUNT(search_tags.term) AS nbr FROM search_tags     GROUP BY search_tags.term) AS TR ON search_tags.term = TR.tk)
WHERE `search_tags`.`dt_added` >= '2011-08-01 09:48:54'
AND `search_tags`.`dt_added` <= '2011-09-02 09:48:54'

// returns the same  [twitter,12],[facebook,6]..... BUT the pagination is broken.

因此数据表可以对行进行计数并将其用作分页参数。

但是当它删除了select时，它会得到所有的行，因为DISTINCT不再存在了。

我被剥夺了睡眠，所以我总是坚持尝试和错误永远。请帮助lol：P

Answer 1

排序

->select('DISTINCT st5.term AS t_name, n_ocurrences', FALSE)        
    ->from("search_tags AS st4 
    RIGHT OUTER JOIN (SELECT DISTINCT st.term, n_ocurrences  
    FROM search_tags AS st 
    JOIN 
    (SELECT term AS n_term, COUNT(term) AS n_ocurrences 
    FROM search_tags AS st2 
    GROUP BY st2.term)
    AS st3 ON st3.n_term = st.term  
    WHERE st.dt_added >= '$min' 
    AND st.dt_added <= '$max')  AS st5 ON st5.term = 1");

必须添加一些启动选择以检索正确的数量。现在我需要在$ min，$ max下计算UNIQUE n_ocurrences，因为n_ocurrences只返回整体计数。

仅计算基于内部SELECT JOIN的唯一术语

1 个答案: