What are query languages?

Some articles on query languages, language, query:

Microsoft Analysis Services - Query Languages - Data Manipulation Language (DML)
... querying OLAP cubes from.NET using ADO.NET Entity Framework and Language INtegrated Query (SSAS Entity Framework Provider is required) SQL - small subset of SQL for querying OLAP cubes and ...
Examples - Expressive Power in Database Theory
... Consequently, a literature sprang up in which many query languages and language constructs were compared on expressive power and efficiency, e.g ... Similar considerations apply for query languages on other types of data, e.g ... XML query languages such as XQuery ...
Codd's Theorem
... algebra and the domain-independent relational calculus queries, two well-known foundational query languages for the relational model, are precisely equivalent in expressive power ... That is, a database query can be formulated in one language if and only if it can be expressed in the other ... An example of such a forbidden query is the query "select all tuples other than those occurring in relation R", where R is a relation in the database ...

Famous quotes containing the words languages and/or query:

    No doubt, to a man of sense, travel offers advantages. As many languages as he has, as many friends, as many arts and trades, so many times is he a man. A foreign country is a point of comparison, wherefrom to judge his own.
    Ralph Waldo Emerson (1803–1882)

    Such condition of suspended judgment indeed, in its more genial development and under felicitous culture, is but the expectation, the receptivity, of the faithful scholar, determined not to foreclose what is still a question—the “philosophic temper,” in short, for which a survival of query will be still the salt of truth, even in the most absolutely ascertained knowledge.
    Walter Pater (1839–1894)