如何在codeigniter活動記錄中編寫sql子查詢？

Question

這是在選擇子查詢和連接子查詢。查詢如下。

SELECT t1.BranchId,t1.BranchName,FORMAT(TotalRevenue/total_trans,2) AS Average,t1.ReadingDate 
    from (SELECT br.BranchName, 
    count(nooftrans)as total_trans,zf.BranchId,ReadingDate,zf.zread_id 
    FROM `ospos_zreads_pdf` zf , ospos_branches br,ospos_zreads_pdf_activity_status zpf 
    WHERE br.BranchId = zf.BranchId and zf.zread_id=zpf.zread_id and ReadingDate >= DATE_SUB(CURDATE(), INTERVAL 1 MONTH) and zpf.zreadactivity='Sales Transaction' 
    group by zf.BranchId)t1 
    join (SELECT br.BranchName,sum(TotalRevenue)as TotalRevenue,zf.BranchId,zread_id,ReadingDate 
    FROM `ospos_zreads_pdf` zf , ospos_branches br 
    WHERE br.BranchId = zf.BranchId and ReadingDate >= DATE_SUB(CURDATE(), INTERVAL 1 MONTH) 
    group by zf.BranchId)t2 on t1.zread_id=t2.zread_id 

Answer 1

您可以禁用與第二參數的一些分貝方法保護：

$this->db->select('id, title, (SELECT COUNT(*) FROM other) as count', FALSE) 

文檔中更多： http://www.codeigniter.com/user_guide/database/query_builder.html