How to filter a database query?

I should do a filter on a query using two fields.
One is a text field (“testofrm”), the other is a select that passes a numeric value (“odcfrm”). If I use both of them (the value from select and then I write a text), it works.
But I would like it to pass the value “all” by default so that I can search a text without using menu or search only through the drop-down menu

231027×147 10.9 KB

24769×249 28.8 KB