question random update

source/xzs/src/main/resources/mapper/QuestionMapper.xml

@@ -234,38 +234,34 @@
   <select id="selectQuestionsByQuestionsNumber"
           resultMap="BaseResultMap">
     <foreach collection="eachList" item="each" separator="union">
-      (SELECT
+      (
-        q.skill_id,
-        q.industry_id,
-        i. NAME AS industry_name,
-        s. NAME AS skill_name,
-        t.content,
-        q.difficult,
-        q.question_type
-      FROM
-        t_question q
-      JOIN (
         SELECT
-          r1.id
+            q.skill_id,
+            q.industry_id,
+            i. NAME AS industry_name,
+            s. NAME AS skill_name,
+            t.content,
+            q.difficult,
+            q.question_type
         FROM
-          t_question AS r1
+          t_question AS q
         JOIN (
         SELECT
           (
             RAND() * (
             SELECT
-              MAX(id)-#{each.eachNumber}
+              MAX(id)
             FROM
               t_question
             )
           ) AS row_id
         ) AS r2
-        JOIN t_industry i ON i.id = r1.industry_id
+        JOIN t_industry i ON i.id = q.industry_id
-        JOIN t_skill s ON s.id = r1.skill_id
+        JOIN t_skill s ON s.id = q.skill_id
-        JOIN t_text_content t ON t.id = r1.info_text_content_id
+        JOIN t_text_content t ON t.id = q.info_text_content_id
         <where>
-          r1.deleted=0 AND
+          q.deleted=0 AND
-          r1.id >= r2.row_id
+          q.id >= r2.row_id
           <if test="each.difficult != null">
             and q.difficult = #{each.difficult}
           </if>
@@ -277,12 +273,9 @@
           </if>
         </where>
         ORDER BY
-        r1.id ASC
+        q.id ASC
         LIMIT #{each.eachNumber}
-      ) AS rows ON (rows.id = q.id)
+      )
-      JOIN t_industry i ON i.id = q.industry_id
-      JOIN t_skill s ON s.id = q.skill_id
-      JOIN t_text_content t ON t.id = q.info_text_content_id)
     </foreach>
 
   </select>