[Bailews]

For example : hProperty[ houses ][ hID] = cache_get_field_content_int(i, "id");

It select only field from mysql but you can't chose from which table? What if I got two `id` in different tables which one will be selected then? Thank for explaining.

[Stinged]

cache_* (except cache_delete and cache_set_active) can only be used when there is an active cache available.
And cache can only be available when a query runs successfully, so you select which table you want in that query.