声明变量mysql

rt4zxlrg  于 2021-06-18  发布在  Mysql
关注(0)|答案(1)|浏览(438)

我试图声明变量并按如下方式运行查询:

$sql = "SELECT @dateconsult := (YEARWEEK('2018-10-01',3)),
               @countunits  := ( SELECT COUNT(s.id_production)
                                 FROM sw_sowing
                                 WHERE status != 0
                                 AND YEARWEEK(date,3) <= @dateconsult
                                 GROUP BY id_production_unit_detail
                               ),
               @quadrants   := ( SELECT DISTINCT value
                                 FROM cf_config
                                 WHERE parameter = 'PLANTHEALTH'
                               );

       SELECT FORMAT(((count_quadrant * 100)/(total_units * Cuadrantes)),3) AS incidence
       FROM (
             SELECT @countunits AS total_units, @quadrants AS Cuadrantes,
             FROM ph_planthealth
             INNER JOIN ph_planthealth_detail ON ph_planthealth_detail.id_p = ph_planthealth.id
             WHERE YEARWEEK(ph_planthealth.date,3) = @dateconsult
             AND ph_planthealth.status = 200
             AND ph_planthealth.id_tenant = 1
             AND ph_planthealth_detail.id_plague != 0
             GROUP BY ph_planthealth_detail.id_plague
      ) AS s
      ORDER BY incidence DESC; ";

    $plague = $this->db->fetchAll($sql, Phalcon\Db::FETCH_ASSOC, $options) ";

问题是它显示了第一个select的结果,这是我声明的变量,而不是第二个select的结果,后者是主查询。
这是我第一次声明变量,我不知道我是否做得对。
我感谢你对这个主题的评论和帮助。

disho6za

disho6za1#

不需要在单独的环境中进行变量赋值 SELECT . 您可以通过加入主查询来完成这些操作。

SELECT FORMAT(((count_quadrant * 100)/(total_units * Cuadrantes)),3) AS incidence
FROM (
     SELECT @countunits AS total_units, @quadrants AS Cuadrantes,
     FROM ph_planthealth
     INNER JOIN ph_planthealth_detail ON ph_planthealth_detail.id_p = ph_planthealth.id
     WHERE YEARWEEK(ph_planthealth.date,3) = @dateconsult
     AND ph_planthealth.status = 200
     AND ph_planthealth.id_tenant = 1
     AND ph_planthealth_detail.id_plague != 0
     GROUP BY ph_planthealth_detail.id_plague
) AS s
CROSS JOIN (
    SELECT @dateconsult := (YEARWEEK('2018-10-01',3)),
           @countunits  := ( SELECT COUNT(s.id_production)
                             FROM sw_sowing
                             WHERE status != 0
                             AND YEARWEEK(date,3) <= @dateconsult
                             GROUP BY id_production_unit_detail
                           ),
           @quadrants   := ( SELECT DISTINCT value
                             FROM cf_config
                             WHERE parameter = 'PLANTHEALTH'
                           )
) AS vars
ORDER BY incidence DESC

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