failed to create table in taosdemo

src/kit/taosdemo/taosdemo.c

@@ -499,7 +499,7 @@ int main(int argc, char *argv[]) {
     /* Create all the tables; */
     printf("Creating %d table(s)......\n", ntables);
     for (int i = 0; i < ntables; i++) {
-      snprintf(command, BUFFER_SIZE, "create table %s.%s%d (ts timestamp%s;", db_name, tb_prefix, i, cols);
+      snprintf(command, BUFFER_SIZE, "create table if not exists %s.%s%d (ts timestamp%s;", db_name, tb_prefix, i, cols);
       queryDB(taos, command);
     }
 
@@ -509,7 +509,7 @@ int main(int argc, char *argv[]) {
   } else {
     /* Create metric table */
     printf("Creating meters super table...\n");
-    snprintf(command, BUFFER_SIZE, "create table %s.meters (ts timestamp%s tags (areaid int, loc binary(10))", db_name, cols);
+    snprintf(command, BUFFER_SIZE, "create table if not exists %s.meters (ts timestamp%s tags (areaid int, loc binary(10))", db_name, cols);
     queryDB(taos, command);
     printf("meters created!\n");
 
@@ -523,9 +523,9 @@ int main(int argc, char *argv[]) {
         j = i % 10;
       }
     if (j % 2 == 0) {
-      snprintf(command, BUFFER_SIZE, "create table %s.%s%d using %s.meters tags (%d,\"%s\");", db_name, tb_prefix, i, db_name, j, "shanghai");
+      snprintf(command, BUFFER_SIZE, "create table if not exists %s.%s%d using %s.meters tags (%d,\"%s\");", db_name, tb_prefix, i, db_name, j, "shanghai");
     } else {
-      snprintf(command, BUFFER_SIZE, "create table %s.%s%d using %s.meters tags (%d,\"%s\");", db_name, tb_prefix, i, db_name, j, "beijing");
+      snprintf(command, BUFFER_SIZE, "create table if not exists %s.%s%d using %s.meters tags (%d,\"%s\");", db_name, tb_prefix, i, db_name, j, "beijing");
     }
       queryDB(taos, command);
     }