diff --git a/readme.md b/readme.md
index 46f41fa..39cc90a 100644
--- a/readme.md
+++ b/readme.md
@@ -27,6 +27,8 @@ curl -X POST --data "name=Hi from curl!" http://<host>:<port>/entities/create
 * read all
 ```
 curl -X GET http://<host>:<port>/entities/info
+curl -X GET http://<host>:<port>/relations/info
+curl -X GET http://<host>:<port>/distances/info
 ```
 
 * read single
diff --git a/relations/.gitignore b/relations/.gitignore
index 06b458e..433022d 100644
--- a/relations/.gitignore
+++ b/relations/.gitignore
@@ -1 +1,3 @@
 cfg-sib00_rgncycle.txt
+*.o
+main
\ No newline at end of file
diff --git a/relations/main.c b/relations/main.c
index d7e30b4..133247c 100644
--- a/relations/main.c
+++ b/relations/main.c
@@ -25,24 +25,32 @@
 #define ROUTE_HELLO "/hello"
 #define ROUTE_ENTITIES "/entities"
 #define ROUTE_RELATIONS "/relations"
+#define ROUTE_DISTANCES "/distances"
 
 pthread_mutex_t mutex=PTHREAD_MUTEX_INITIALIZER;
 
 /**
  * callback functions declaration
  */
+/* callback for Test*/
 int callback_get_hello (const struct _u_request * request, struct _u_response * response, void * user_data);
 
+/* callback for Root*/
 int callback_default (const struct _u_request * request, struct _u_response * response, void * user_data);
+
 /* callback for Entities*/
 int callback_create_entity (const struct _u_request * request, struct _u_response * response, void * user_data);
 int callback_get_entities (const struct _u_request * request, struct _u_response * response, void * user_data);
 int callback_get_entity (const struct _u_request * request, struct _u_response * response, void * user_data);
 int callback_update_entity (const struct _u_request * request, struct _u_response * response, void * user_data);
 int callback_delete_entity (const struct _u_request * request, struct _u_response * response, void * user_data);
+
 /* callback for Relations*/
 int callback_get_relations (const struct _u_request * request, struct _u_response * response, void * user_data);
 
+/* callback for Distances*/
+int callback_get_distances (const struct _u_request * request, struct _u_response * response, void * user_data);
+
 /**
  * decode a u_map into a string
  */
@@ -193,6 +201,9 @@ int main(int argc, char *argv[]) {
   /* callbacks for Relations*/
   ulfius_add_endpoint_by_val(&instance, "GET", ROUTE_RELATIONS, "/info", 0, &callback_get_relations, (void *)conn);
 
+  /* callbacks for Distances*/
+  ulfius_add_endpoint_by_val(&instance, "GET", ROUTE_DISTANCES, "/info", 0, &callback_get_distances, (void *)conn);
+
   // default_endpoint declaration
   ulfius_set_default_endpoint(&instance, &callback_default, NULL);
 
@@ -279,10 +290,10 @@ int callback_get_entity (const struct _u_request * request, struct _u_response *
       conn = (PGconn *)user_data;
 
       /*define prepared statement*/
-      len=snprintf(NULL,0,"SELECT * FROM entities WHERE entity_id=%s;",value);
+      len=snprintf(NULL,0,"SELECT * FROM tbl_entities WHERE entity_id=%s;",value);
       prepStmEntities=malloc((size_t)(len+1));
       //TODO Release prepStmEntities!
-      snprintf(prepStmEntities,(size_t)(len+1),"SELECT * FROM entities WHERE entity_id=%s;",value);
+      snprintf(prepStmEntities,(size_t)(len+1),"SELECT * FROM tbl_entities WHERE entity_id=%s;",value);
       //printf("callback_get_entity() prepStmEntities: %s\n",prepStmEntities);
 
       //lock PGconn mutex
@@ -340,7 +351,7 @@ int callback_get_entity (const struct _u_request * request, struct _u_response *
       }
     }
   }else{
-    printf("callback_delete_entity() HTTP GET request error!\n");
+    printf("callback_get_entity() HTTP GET request error!\n");
     ulfius_set_string_body_response(response, 400, "This is the /entity/:id/info route: HTTP GET request error!");
   }
   /*clean up remainings*/
@@ -363,7 +374,7 @@ int callback_get_entities (const struct _u_request * request, struct _u_response
   conn = (PGconn *)user_data;
 
   /*define prepared statement*/
-  prepStmEntities = "SELECT * FROM entities;";
+  prepStmEntities = "SELECT * FROM tbl_entities;";
 
   //lock PGconn mutex
   pthread_mutex_lock(&mutex);
@@ -436,7 +447,7 @@ int callback_get_relations (const struct _u_request * request, struct _u_respons
   conn = (PGconn *)user_data;
 
   /*define prepared statement*/
-  prepStmEntities = "SELECT * FROM relations;";
+  prepStmEntities = "SELECT * FROM tbl_relations;";
 
   //lock PGconn mutex
   pthread_mutex_lock(&mutex);
@@ -486,6 +497,71 @@ int callback_get_relations (const struct _u_request * request, struct _u_respons
   return U_CALLBACK_CONTINUE;
 }
 
+/**
+ * Callback function to reply all distances
+ */
+int callback_get_distances (const struct _u_request * request, struct _u_response * response, void * user_data) {
+  /*declarations*/
+  PGconn *conn;
+  char *prepStmEntities;
+  PGresult *pqRes;
+  int nbRecords,nbFields;
+  json_t *arrayRecords, *arrayFields,  *stringField;
+
+  printf("callback_get_distances() Started...\n");
+  conn = (PGconn *)user_data;
+
+  /*define prepared statement*/
+  prepStmEntities = "SELECT * FROM tbl_distances;";
+
+  //lock PGconn mutex
+  pthread_mutex_lock(&mutex);
+
+  /*create prepared statement*/
+  pqRes = PQexecParams(conn, prepStmEntities, 0, NULL, NULL, NULL, NULL, 0);
+
+  //unlock PGconn mutex
+  pthread_mutex_unlock(&mutex);
+
+  if (PQresultStatus(pqRes) != PGRES_TUPLES_OK) {
+    printf("callback_get_distances() No data retrieved\n");
+    /*clean up result*/
+    PQclear(pqRes);
+    //TODO Why this casting?
+    (void)(request);
+    (void)(user_data);
+    ulfius_set_string_body_response(response, 500, "This is the /distances route: Dba error!");
+    printf("callback_get_distances() Done.\n");
+    return U_CALLBACK_CONTINUE;
+  }
+
+  /*evaluate result*/
+  nbRecords = PQntuples(pqRes);
+  nbFields = PQnfields(pqRes);
+  arrayRecords=json_array();
+  for(int i=0;i<nbRecords;i++){
+    arrayFields=json_array();
+    for(int j=0;j<nbFields;j++){
+      stringField = json_string(PQgetvalue(pqRes,i,j));
+      json_array_append(arrayFields, stringField);
+      json_decref(stringField);
+    }
+    json_array_append(arrayRecords, arrayFields);
+    json_decref(arrayFields);
+  }
+  /*clean up result*/
+  PQclear(pqRes);
+  /*set response body*/
+  ulfius_set_json_body_response(response, 200, arrayRecords);
+  /*clean up JSON*/
+  json_decref(arrayRecords);
+  //TODO Why this casting?
+  (void)(request);
+  (void)(user_data);
+  printf("callback_get_distances() Done.\n");
+  return U_CALLBACK_CONTINUE;
+}
+
 int query_db (const PGconn * conn, const char ** queryStr, const char ** valueStr){
   /*declarations*/
   int res;
@@ -564,7 +640,7 @@ int callback_delete_entity (const struct _u_request * request, struct _u_respons
       //printf("callback_delete_entity() key is %s, value is %s\n", keys[0], value);
 
       //TODO delete entity
-      const char * queryEntities="DELETE FROM entities WHERE entity_id=%s RETURNING *;";
+      const char * queryEntities="DELETE FROM tbl_entities WHERE entity_id=%s RETURNING *;";
       int delRes=query_db((PGconn *)user_data,&queryEntities,&value);
       if(delRes!=0){
 	//TODO Why this casting?