FS-3527 this fixes part of the problem with MSSQL

src/switch_core_sqldb.c

@@ -2114,6 +2114,14 @@ SWITCH_DECLARE(void) switch_cache_db_status(switch_stream_handle_t *stream)
 	switch_mutex_unlock(sql_manager.dbh_mutex);
 }
 
+SWITCH_DECLARE(char*)switch_sql_concat()
+{
+	if(runtime.odbc_dbtype == DBTYPE_MSSQL)
+		return "+";
+
+	return "||";
+}
+
 /* For Emacs:
  * Local Variables:
  * mode:c