update

mec-biz/src/main/resources/config/mybatis/PracticeGroupMapper.xml

@@ -415,7 +415,10 @@
     </resultMap>
     <select id="queryStudentBuys" resultMap="queryStudentBuysMap">
         SELECT o.`name_` organ_name_,a.student_id_,u.`username_` student_name_,u.phone_,
-        b.lastClassDate last_class_date_,c.firstBuyTime first_buy_time_ FROM
+        b.lastClassDate last_class_date_,c.firstBuyTime first_buy_time_,
+        CASE WHEN DATEDIFF(c.firstBuyTime,b.lastClassDate) &lt; 0 THEN 0 ELSE DATEDIFF(c.firstBuyTime,b.lastClassDate) END interval_day_,
+        CASE WHEN c.firstBuyTime IS NULL THEN 0 ELSE 1 END buy_practice_
+        FROM
         (SELECT DISTINCT(pg.`student_id_`),pg.`organ_id_`   FROM `practice_group` pg WHERE pg.`group_status_` in ('NORMAL','FINISH')) a
         LEFT JOIN (SELECT pg.`student_id_`  ,max(concat(cs.`class_date_`,' ',cs.`end_class_time_` )) lastClassDate   FROM `practice_group` pg
         LEFT JOIN `course_schedule` cs on cs.`music_group_id_` = pg.`id_` and cs.`group_type_` = 'PRACTICE'