diff --git a/ccic-exam/src/main/resources/mappers/ExamStatisticsMapper.xml b/ccic-exam/src/main/resources/mappers/ExamStatisticsMapper.xml
index 0feef75..2e4e585 100644
--- a/ccic-exam/src/main/resources/mappers/ExamStatisticsMapper.xml
+++ b/ccic-exam/src/main/resources/mappers/ExamStatisticsMapper.xml
@@ -241,10 +241,10 @@
         WHERE
         scores.is_deleted = 0
         <if test="examName != null and examName != ''">
-            AND info.exam_name LIKE '%' + #{examName} + '%'
+            AND info.exam_name LIKE '%' || #{examName} || '%'
         </if>
         <if test="paperName != null and paperName != ''">
-            AND paper.paper_name LIKE '%' + #{paperName} + '%'
+            AND paper.paper_name LIKE '%' || #{paperName} || '%'
         </if>
         <if test="industry != null and industry != ''">
             AND ind.industry_id = #{industry}
@@ -369,7 +369,7 @@
         WHERE
             paper.is_deleted = 0
         <if test="paperName != null and paperName != ''">
-            AND paper.paper_name LIKE '%' + #{paperName} + '%'
+            AND paper.paper_name LIKE '%' || #{paperName} || '%'
         </if>
         <if test="industry != null and industry != ''">
             AND ind.industry_id = #{industry}