Query containment

  • What are the types of query?

    A few of the more popular queries include:

    Single-Table Select query.Multiple-Table Select query.Range query.Complex query.Totals query.Action query.Parameter query.Crosstab query..

  • What does it mean to query data?

    Database Query Definition
    In everyday language, a query is simply a request for information.
    Similarly, the meaning of a query in database management is a request for data..

  • What is a query in SQL?

    What Does Query Mean? A query is a request for data or information from a database table or combination of tables.
    This data may be generated as results returned by Structured Query Language (SQL) or as pictorials, graphs or complex results, e.g., trend analyses from data-mining tools..

  • What is query containment?

    Definition.
    One query is contained in another if, independent of the values of the “stored data” (that is, database), the set of answers to the first query on the database is a subset of the set of answers to the second query on the same database..

  • What is the purpose of a query?

    A query can give you an answer to a simple question, perform calculations, combine data from different tables, add, change, or delete data from a database..

  • A query in a database is a request for information from a database management system (DBMS), which is the software program that maintains data.
    Users can make a query to retrieve data or change information in a database, such as adding or removing data.
  • A query is a mechanism to extract new information from given information stored in some form.
    The extracted information is called the answer to the query.
    In the most general sense, a query is an arbitrary (computable) function, from some input to some output.
  • What is a query? A query is a question or a request for information expressed in a formal manner.
    In computer science, a query is essentially the same thing, the only difference is the answer or retrieved information comes from a database.
Definition. One query is contained in another if, independent of the values of the “stored data” (that is, database), the set of answers to the first query on the database is a subset of the set of answers to the second query on the same database.
In this lecture we will study when we can say that two conjunctive queries that are syntactically different express the same query, or when the output of 

Are query containment and equivalence NP-complete?

Zachary Ives, in Principles of Data Integration, 2012 Query containment has been an active area of research for many years, beginning with Chandra and Merlin [114 ], who proved that query containment and equivalence are NP-complete for conjunctive queries.
Sagiv and Yannakakis first considered queries with unions and negation [ 502 ].

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How do I use container queries?

To use container queries, you need to declare a containment context on an element so that the browser knows you might want to query the dimensions of this container later.
To do this, use the container-type property with a value of size, inline-size, or normal .
The query will be based on the inline and block dimensions of the container.

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What is constructive query containment?

Constructive query containment is aimed at building a counter- example that shows that containment does not hold for the given pair of queries.
That is, the containment test of Q1 in Q2—denoted Q1 N2 Q—will fail, if there is a consistent instance in which the answer to Q1 has a tuple that is not in the answer to Q2.

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What is database containment?

Instance level logins, linked servers, SQL Agent jobs, SSIS packages, Tempdb collation, and even other databases often need to be manually copied and synchronized between instances when a database is being log shipped, mirrored, or part of an Availability Group.
The Database containment feature puts all of these items within the database itself.


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