diff --git a/src/main/java/com/example/caseData/dao/CaseClinicalArticleDao.java b/src/main/java/com/example/caseData/dao/CaseClinicalArticleDao.java
index c4b8787..a3bf51c 100644
--- a/src/main/java/com/example/caseData/dao/CaseClinicalArticleDao.java
+++ b/src/main/java/com/example/caseData/dao/CaseClinicalArticleDao.java
@@ -45,6 +45,8 @@ public interface CaseClinicalArticleDao extends BaseMapper<CaseClinicalArticleMo
      * @param numeral   减少的数值
      * @return 更新的行数
      */
-    @Update("UPDATE case_clinical_article SET ${field} = ${field} - #{numeral} WHERE article_id = #{articleId}")
+    @Update("UPDATE case_clinical_article " +
+            "SET ${field} = CASE WHEN ${field} >= #{numeral} THEN ${field} - #{numeral} ELSE 0 END " +
+            "WHERE article_id = #{articleId}")
     int dec(@Param("articleId") Long articleId, @Param("field") String field, @Param("numeral") int numeral);
 } 
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diff --git a/src/main/java/com/example/caseData/dao/StatsCaseClinicalDao.java b/src/main/java/com/example/caseData/dao/StatsCaseClinicalDao.java
index c3d18df..2a63f5e 100644
--- a/src/main/java/com/example/caseData/dao/StatsCaseClinicalDao.java
+++ b/src/main/java/com/example/caseData/dao/StatsCaseClinicalDao.java
@@ -24,6 +24,8 @@ public interface StatsCaseClinicalDao extends BaseMapper<StatsCaseClinicalModel>
      * @param numeral   减少的数值
      * @return 更新的行数
      */
-    @Update("UPDATE stats_case_clinical SET ${field} = ${field} - #{numeral} WHERE stats_id = #{statsId}")
+    @Update("UPDATE stats_case_clinical " +
+            "SET ${field} = CASE WHEN ${field} >= #{numeral} THEN ${field} - #{numeral} ELSE 0 END " +
+            "WHERE stats_id = #{statsId}")
     int dec(@Param("statsId") Long articleId, @Param("field") String field, @Param("numeral") int numeral);
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/caseData/dao/StatsCaseClinicalDoctorDao.java b/src/main/java/com/example/caseData/dao/StatsCaseClinicalDoctorDao.java
index 6e82dec..80a34c9 100644
--- a/src/main/java/com/example/caseData/dao/StatsCaseClinicalDoctorDao.java
+++ b/src/main/java/com/example/caseData/dao/StatsCaseClinicalDoctorDao.java
@@ -42,6 +42,8 @@ public interface StatsCaseClinicalDoctorDao extends BaseMapper<StatsCaseClinical
      * @param numeral   减少的数值
      * @return 更新的行数
      */
-    @Update("UPDATE stats_case_clinical_doctor SET ${field} = ${field} - #{numeral} WHERE doctor_id = #{doctorId}")
+    @Update("UPDATE stats_case_clinical_doctor " +
+            "SET ${field} = CASE WHEN ${field} >= #{numeral} THEN ${field} - #{numeral} ELSE 0 END " +
+            "WHERE doctor_id = #{doctorId}")
     int dec(@Param("doctorId") Long articleId, @Param("field") String field, @Param("numeral") int numeral);
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/caseData/dao/StatsCaseClinicalHospitalDao.java b/src/main/java/com/example/caseData/dao/StatsCaseClinicalHospitalDao.java
index a8b95bb..ccfa94a 100644
--- a/src/main/java/com/example/caseData/dao/StatsCaseClinicalHospitalDao.java
+++ b/src/main/java/com/example/caseData/dao/StatsCaseClinicalHospitalDao.java
@@ -42,6 +42,8 @@ public interface StatsCaseClinicalHospitalDao extends BaseMapper<StatsCaseClinic
      * @param numeral   减少的数值
      * @return 更新的行数
      */
-    @Update("UPDATE stats_case_clinical_hospital SET ${field} = ${field} - #{numeral} WHERE hospital_id = #{hospitalId}")
+    @Update("UPDATE stats_case_clinical_hospital " +
+            "SET ${field} = CASE WHEN ${field} >= #{numeral} THEN ${field} - #{numeral} ELSE 0 END " +
+            "WHERE hospital_id = #{hospitalId}")
     int dec(@Param("hospitalId") Long articleId, @Param("field") String field, @Param("numeral") int numeral);
 }
\ No newline at end of file