Question

    SELECT   dates,
             SUM(Total_Likes) AS Total_likes,
             SUM(Real_Like) AS Real_Like,
             SUM(Secret_like) AS Secret_like
    FROM
    (
     SELECT  CAST(added_datetime AS DATE) AS dates,
          SUM(IF(like_flag=1,1,-1)) AS Total_Likes,

         ( 
             SELECT SUM(IF(like_flag=1,1,-1)) 
             FROM like_message_audit_log la
             WHERE  user_profile_type=1 AND CAST(added_datetime AS DATE)= '2017-07-21'
             AND    like_mode IN(1,2) 
             GROUP BY user_profile_id_fk
              ) AS Real_Like,
          (

           SELECT SUM(IF(like_flag=1,1,-1)) 
           FROM like_message_audit_log la
           WHERE  user_profile_type=2 AND CAST(added_datetime AS DATE)= '2017-07-21'
           AND    like_mode IN(1,2) 
           GROUP BY user_profile_id_fk
           )AS Secret_like

       FROM like_message_audit_log la
       WHERE  CAST(added_datetime AS DATE)= '2017-07-21'
       AND    like_mode IN(1,2) 
    )AS t
     GROUP BY dates;

以上查询只运行一个日期但我想在两个日期之间的日期范围运行它如何编写该查询请建议

以上查询的输出如下：日期Total_likes Real_Like Secret_like 2017-07-21 16 15 1

我重写上面的查询，如：

      SELECT  dates,
   SUM(Total_Likes) AS Total_likes,
    SUM(real_likes_count) AS Real_Like,
    SUM(secret_likes_count) AS Secret_like
    FROM
    (
  SELECT 
        CAST(added_datetime AS DATE) AS Dates,
        like_mode AS modes,
        COUNT(CASE WHEN like_flag=1 THEN 1 END) AS Total_Likes,
        COUNT(CASE WHEN like_flag=1 AND user_profile_type=1 THEN 1 END) AS real_likes_count,
        COUNT(CASE WHEN like_flag=1 AND user_profile_type=2 THEN 1 END) AS secret_likes_count
    FROM like_message_audit_log la
    WHERE added_datetime IN 
            (   SELECT MAX(lb.added_datetime) AS added_datetime
                FROM like_message_audit_log lb
                WHERE la.user_profile_id_fk=la.user_profile_id_fk AND lb.message_unique_id_fk=la.message_unique_id_fk
                GROUP BY user_profile_id_fk, message_unique_id_fk
            )
    GROUP BY CAST(added_datetime AS DATE) 


    )AS t

    WHERE dates BETWEEN '2017-07-21' AND '2017-08-04'
      AND    modes IN(1,2) 
   GROUP BY  Dates
   ORDER BY  Dates DESC;

此查询有效，但需要花费太多时间我可以优化以上查询

Answer 1

https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#operator_between

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
elementFormDefault="qualified" 
targetNamespace="urn:company.Namespace" >
    <xs:element name="company">
        <xs:complexType>
            <xs:sequence>
                <xs:element type="xs:string" name="companyname"/>
                <xs:element type="xs:string" name="address"/>

                <xs:element name="department">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element type="xs:string" name="dname"/>
                            <xs:element type="xs:short" name="deptphoneno"/>
                            <xs:element type="xs:short" name="deptfaxno"/>
                            <xs:element type="xs:string" name="deptemail"/>

                            <xs:element name="employee">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element type="xs:short" name="empid"/>
                                        <xs:element type="xs:string" name="ename"/>
                                        <xs:element type="xs:string" name="emailid"/>
                                        <xs:element type="xs:short" name="phoneno"/>
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>

                            <xs:element name="contractemployee">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element type="xs:string" name="name"/>
                                        <xs:element type="xs:short" name="phoneno"/>
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>

                        </xs:sequence>
                    </xs:complexType>
                </xs:element>    
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

Answer 2

SELECT added_datetime,user_profile_id_fk,
SUM(CASE WHEN user_profile_type=1 THEN 1 ELSE 0 END) AS Real_Like,
SUM(CASE WHEN user_profile_type=2 THEN 1 ELSE 0 END) AS Secret_like,
SUM(1) AS Total_likes
FROM like_message_audit_log la
WHERE  CAST(added_datetime AS DATE) BETWEEN '2016-07-21' AND '2018-07-21'
AND    like_mode IN(1,2) 
GROUP BY user_profile_id_fk,added_datetime

您可以查看Fiddle Demo

您可以尝试以上查询。我认为这是优化方式。

如何在查询中使用join来从多个子查询中获取数据

2 个答案: