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business-service/src/main/resources/mapper/TerminalHeartbeatLogMapper.xml

@@ -3,12 +3,15 @@
 <mapper namespace="com.ozs.mapper.TerminalHeartbeatLogMapper">
 
     <select id="terminalHeartbeatLogList" resultType="com.ozs.entity.TerminalHeartbeatLog">
-        SELECT camera_code,channel
+      SELECT camera_code, channel
 FROM (
-    SELECT DISTINCT camera_code,channel
-    FROM terminal_heartbeat_log
-    LIMIT 4
-) AS subquery
-ORDER BY camera_code DESC;
+    SELECT DISTINCT camera_code, channel
+    FROM (
+        SELECT camera_code, channel, CREATE_TIME
+        FROM terminal_heartbeat_log
+        ORDER BY CREATE_TIME DESC
+    ) AS sorted_data
+) AS distinct_data
+LIMIT 4;
     </select>
 </mapper>