fix 我的题库

zhongzheng-system/src/main/resources/mapper/modules/user/UserExamRecordMapper.xml

@@ -163,7 +163,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 
     <select id="selectDoNum" parameterType="com.zhongzheng.modules.user.bo.UserExamRecordQueryBo" resultType="Long">
         SELECT
-            IFNULL( COUNT(*), 0 ) num
+            COUNT(1) num
         FROM
             (
                 SELECT