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我使用 codeigniter 2.1，我收到关于 SQL 版本的错误我真的需要执行这个代码..但是如何做到这一点

显示的错误：

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT rt.srt_id, rt.pub_id, d.sd_date, CASE WHEN d.sd_doc != '' THEN d' at line 2

SET @i = 0.0; SELECT rt.srt_id, rt.pub_id, d.sd_date, CASE WHEN d.sd_doc != '' THEN d.sd_doc END sd_doc, rt.total_sales, @i + rt.total_sales AS Cumulative_Total, @i:= CASE WHEN d.sd_doc = '' THEN @i + rt.total_sales ELSE 0 END AS Increment FROM d_statistics_report_temp rt INNER JOIN d_statistics_docs d ON rt.pub_id = d.sd_pub AND rt.sal_must_pay_date = d.sd_date ORDER BY rt.pub_id, d.sd_date;

Filename: C:\xampp\htdocs\ebook\system\database\DB_driver.php

Line Number: 330

SQL查询是：

 $result = $this->db->query(
            "SET @i = 0.0;
           SELECT   rt.srt_id,
                           rt.pub_id,
                           d.sd_date,
                           CASE WHEN d.sd_doc != '' THEN d.sd_doc END sd_doc,
                           rt.total_sales,
                           @i + rt.total_sales AS Cumulative_Total,
                           @i:= CASE WHEN d.sd_doc = '' THEN @i + rt.total_sales ELSE 0 END AS Increment
           FROM d_statistics_report_temp rt
                           INNER JOIN d_statistics_docs d
                                   ON rt.pub_id = d.sd_pub
                                   AND rt.sal_must_pay_date = d.sd_date
           ORDER BY rt.pub_id, d.sd_date; "
        );
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