Google has quietly removed one of the older search operators, the + search operator. Now if you try adding a + sign in your query, Google will ignore it. Why did Google remove the old search operator?

Google published an Advanced SEO Help page about using Google search operators to debug a website. Google search operator search results are not tied to Google’s regular ranking algorithm and the ...

Query optimization lies at the heart of modern database management systems, striving to identify the most efficient access and execution plan for a given declarative query. Traditional optimisers ...