diff --git a/Dao/MyBatis/Maps/CM.xml b/Dao/MyBatis/Maps/CM.xml
index ab81501..8d8d397 100644
--- a/Dao/MyBatis/Maps/CM.xml
+++ b/Dao/MyBatis/Maps/CM.xml
@@ -261,7 +261,7 @@
           ,typeedu              =#typeedu#
           ,typegrade            =#typegrade#
           ,typejob              =#typejob#
-          ,iscertificate        =case when #iscertificate# is not null then #iscertificate# else iscertificate end
+          ,iscertificate        =#iscertificate#
           where cmno=#cmno#
         </update>
         <update id="cm.data.delete" parameterClass="hashtable">