diff --git a/src/main/resources/mapper/course/CourseDao.xml b/src/main/resources/mapper/course/CourseDao.xml
index bad4349b..7bd42214 100644
--- a/src/main/resources/mapper/course/CourseDao.xml
+++ b/src/main/resources/mapper/course/CourseDao.xml
@@ -7,111 +7,6 @@
         where course_id = #{id}
     </update>
     <select id="selectCourse" resultType="Map">
-        SELECT
-        c.classify_id AS classifyId,
-        c.course_id AS courseId,
-        c.course_label AS courseLabel,
-        c.create_time AS createTime,
-        c.details,
-        c.img,
-        c.banner_img AS bannerImg,
-        c.status,
-        c.is_delete AS isDelete,
-        c.msg_type AS msgType,
-        c.msg_url AS msgUrl,
-        c.pay_num AS payNum,
-        c.price,
-        c.wholesale_price AS wholesalePrice,
-        c.is_over AS isOver,
-        c.title,
-        c.is_price AS isPrice,
-        c.title_img AS titleImg,
-        c.update_time AS updateTime,
-        cc.classification_name AS classificationName,
-        c.course_type AS courseType,
-        c.banner_id AS bannerId,
-        b.name AS bannerName,
-        0 AS viewCounts,
-        c.dy_img_id AS dyImgId,
-        c.dy_course_id AS dyCourseId,
-        c.wx_course_id AS wxCourseId,
-        c.wx_show AS wxShow,
-        c.dy_show AS dyShow,
-        c.sort,
-        ROUND(10000 * RAND(), 0) AS goodNum,
-        d.courseDetailsCount,
-        NULL AS courseDetailsName,
-        NULL AS courseDetailsId,
-        ROUND(10000 * RAND(), 0) AS weekGoodNum,
-        0 AS isRecommend
-        FROM
-        course AS c
-        LEFT JOIN
-        course_classification AS cc ON c.classify_id = cc.classification_id
-        LEFT JOIN
-        banner AS b ON b.id = c.banner_id
-        LEFT JOIN
-        (SELECT course_id, COUNT(*) AS courseDetailsCount
-        FROM course_details
-        GROUP BY course_id) AS d ON c.course_id = d.course_id
-        LEFT JOIN
-        (SELECT course_id FROM course_details WHERE good = 1) AS gd ON c.course_id = gd.course_id
-        WHERE
-        c.is_delete = 0
-        <if test='null != wxShow and wxShow == 1'>
-            AND c.wx_show = #{wxShow}
-        </if>
-        <if test='null != wxShow and wxShow == 2'>
-            AND (c.wx_show = #{wxShow} OR c.wx_show IS NULL)
-        </if>
-        <if test='null != dyShow and dyShow == 1'>
-            AND c.dy_show = #{dyShow}
-        </if>
-        <if test='null != dyShow and dyShow == 2'>
-            AND (c.dy_show = #{dyShow} OR c.dy_show IS NULL)
-        </if>
-        <if test='null != title'>
-            AND c.title LIKE CONCAT('%', #{title}, '%')
-        </if>
-        <if test='null != classifyId and classifyId != 0'>
-            AND c.classify_id = #{classifyId}
-        </if>
-        <if test='null != bannerId and bannerId != 0'>
-            AND c.banner_id = #{bannerId}
-        </if>
-        <if test="classifyId == 0">
-            AND c.is_recommend = 1
-        </if>
-        <if test="over != null">
-            AND c.is_over = #{over}
-        </if>
-        <if test="isRecommend != null and isRecommend != -1">
-            AND gd.course_id IS NOT NULL
-        </if>
-        <if test="status != null and status != 0">
-            AND c.status = #{status}
-        </if>
-        <if test="isPrice != null">
-            AND c.is_price = #{isPrice}
-        </if>
-        <if test="wxCourse != null">
-            AND c.wx_course_id IS NOT NULL
-        </if>
-        <if test="dyCourse != null">
-            AND c.dy_status = 4
-        </if>
-        <if test="sort == null">
-            ORDER BY c.sort ASC, c.create_time DESC
-        </if>
-        <if test="sort != null and sort == 1">
-            ORDER BY goodNum DESC
-        </if>
-        <if test="sort != null and sort == 2">
-            ORDER BY weekGoodNum DESC
-        </if>;
-
-
-<!--
         SELECT
         c.classify_id as classifyId,
         c.course_id as courseId,
@@ -144,7 +39,7 @@
         c.dy_show as dyShow,
         c.sort,
         round(10000*rand(),0) as goodNum,
-        (select count(*) from course_details d where d.course_id=c.course_id ) as courseDetailsCount,
+        cd.course_details_count as courseDetailsCount,  -- Replaced subquery with left join count
         null AS courseDetailsName,
         null AS courseDetailsId,
         round(10000*rand(),0) as weekGoodNum,
@@ -152,62 +47,170 @@
         FROM
         course AS c
         LEFT JOIN course_classification AS cc ON c.classify_id = cc.classification_id
-        left join banner as b on b.id=c.banner_id
+        LEFT JOIN banner AS b ON b.id = c.banner_id
+        LEFT JOIN (
+        SELECT
+        course_id,
+        COUNT(*) as course_details_count
+        FROM
+        course_details
+        GROUP BY
+        course_id
+        ) AS cd ON c.course_id = cd.course_id
         WHERE
         1 = 1
         AND c.is_delete = 0
         <if test='null != wxShow and wxShow==1'>
-            and c.wx_show = #{wxShow}
+            AND c.wx_show = #{wxShow}
         </if>
         <if test='null != wxShow and wxShow==2'>
-            and (c.wx_show = #{wxShow} or c.wx_show is null)
+            AND (c.wx_show = #{wxShow} OR c.wx_show IS NULL)
         </if>
         <if test='null != dyShow and dyShow==1'>
-            and c.dy_show = #{dyShow}
+            AND c.dy_show = #{dyShow}
         </if>
         <if test='null != dyShow and dyShow==2'>
-            and (c.dy_show = #{dyShow} or c.dy_show is null)
+            AND (c.dy_show = #{dyShow} OR c.dy_show IS NULL)
         </if>
         <if test='null != title'>
-            and c.title LIKE CONCAT('%', #{title}, '%')
+            AND c.title LIKE CONCAT('%', #{title}, '%')
         </if>
-        <if test='null!= classifyId and classifyId!=0'>
-            and c.classify_id = #{classifyId}
+        <if test='null != classifyId and classifyId != 0'>
+            AND c.classify_id = #{classifyId}
         </if>
-        <if test='null!= bannerId and bannerId!=0'>
-            and c.banner_id = #{bannerId}
+        <if test='null != bannerId and bannerId != 0'>
+            AND c.banner_id = #{bannerId}
         </if>
-        <if test="classifyId==0">
-            and c.is_recommend=1
+        <if test="classifyId == 0">
+            AND c.is_recommend = 1
         </if>
-        <if test="over!=null">
-            and c.is_over=#{over}
+        <if test="over != null">
+            AND c.is_over = #{over}
         </if>
-        <if test="isRecommend!=null and isRecommend!=-1">
-            and c.course_id in (select course_id from course_details where good=1)
+        <if test="isRecommend != null and isRecommend != -1">
+            AND c.course_id IN (SELECT course_id FROM course_details WHERE good = 1)
         </if>
-        <if test="status!=null and status!=0">
-            and c.status=#{status}
+        <if test="status != null and status != 0">
+            AND c.status = #{status}
         </if>
-        <if test="isPrice!=null">
-            and c.is_price=#{isPrice}
+        <if test="isPrice != null">
+            AND c.is_price = #{isPrice}
         </if>
-        <if test="wxCourse!=null">
-            and c.wx_course_id is not null
+        <if test="wxCourse != null">
+            AND c.wx_course_id IS NOT NULL
         </if>
-        <if test="dyCourse!=null">
-            and c.dy_status=4
+        <if test="dyCourse != null">
+            AND c.dy_status = 4
         </if>
-        <if test="sort==null">
-            order by c.sort asc,c.create_time desc
+        <if test="sort == null">
+            ORDER BY c.sort ASC, c.create_time DESC
         </if>
-        <if test="sort!=null and sort==1">
-            order by goodNum desc
+        <if test="sort != null and sort == 1">
+            ORDER BY goodNum DESC
         </if>
-        <if test="sort!=null and sort==2">
-            order by weekGoodNum desc
+        <if test="sort != null and sort == 2">
+            ORDER BY weekGoodNum DESC
         </if>
-        -->
+
+
+
+        <!--
+                SELECT
+                c.classify_id as classifyId,
+                c.course_id as courseId,
+                c.course_label as courseLabel,
+                c.create_time createTime,
+                c.details,
+                c.img,
+                c.banner_img as bannerImg,
+                c.status,
+                c.is_delete as isDelete,
+                c.msg_type msgType,
+                c.msg_url as msgUrl,
+                c.pay_num as payNum,
+                c.price,
+                c.wholesale_price as wholesalePrice,
+                c.is_over as isOver,
+                c.title,
+                c.is_price as isPrice,
+                c.title_img as titleImg,
+                c.update_time as updateTime,
+                cc.classification_name as classificationName,
+                c.course_type as courseType,
+                c.banner_id as bannerId,
+                b.name as bannerName,
+                0 as viewCounts,
+                c.dy_img_id as dyImgId,
+                c.dy_course_id as dyCourseId,
+                c.wx_course_id as wxCourseId,
+                c.wx_show as wxShow,
+                c.dy_show as dyShow,
+                c.sort,
+                round(10000*rand(),0) as goodNum,
+                (select count(*) from course_details d where d.course_id=c.course_id ) as courseDetailsCount,
+                null AS courseDetailsName,
+                null AS courseDetailsId,
+                round(10000*rand(),0) as weekGoodNum,
+                0 as isRecommend
+                FROM
+                course AS c
+                LEFT JOIN course_classification AS cc ON c.classify_id = cc.classification_id
+                left join banner as b on b.id=c.banner_id
+                WHERE
+                1 = 1
+                AND c.is_delete = 0
+                <if test='null != wxShow and wxShow==1'>
+                    and c.wx_show = #{wxShow}
+                </if>
+                <if test='null != wxShow and wxShow==2'>
+                    and (c.wx_show = #{wxShow} or c.wx_show is null)
+                </if>
+                <if test='null != dyShow and dyShow==1'>
+                    and c.dy_show = #{dyShow}
+                </if>
+                <if test='null != dyShow and dyShow==2'>
+                    and (c.dy_show = #{dyShow} or c.dy_show is null)
+                </if>
+                <if test='null != title'>
+                    and c.title LIKE CONCAT('%', #{title}, '%')
+                </if>
+                <if test='null!= classifyId and classifyId!=0'>
+                    and c.classify_id = #{classifyId}
+                </if>
+                <if test='null!= bannerId and bannerId!=0'>
+                    and c.banner_id = #{bannerId}
+                </if>
+                <if test="classifyId==0">
+                    and c.is_recommend=1
+                </if>
+                <if test="over!=null">
+                    and c.is_over=#{over}
+                </if>
+                <if test="isRecommend!=null and isRecommend!=-1">
+                    and c.course_id in (select course_id from course_details where good=1)
+                </if>
+                <if test="status!=null and status!=0">
+                    and c.status=#{status}
+                </if>
+                <if test="isPrice!=null">
+                    and c.is_price=#{isPrice}
+                </if>
+                <if test="wxCourse!=null">
+                    and c.wx_course_id is not null
+                </if>
+                <if test="dyCourse!=null">
+                    and c.dy_status=4
+                </if>
+                <if test="sort==null">
+                    order by c.sort asc,c.create_time desc
+                </if>
+                <if test="sort!=null and sort==1">
+                    order by goodNum desc
+                </if>
+                <if test="sort!=null and sort==2">
+                    order by weekGoodNum desc
+                </if>
+                -->
     </select>
 
     <select id="selectCourseAdmin" resultType="Map">