query optimizer
1Query optimizer — The query optimizer is the component of a database management system that attempts to determine the most efficient way to execute a query. The optimizer considers the possible query plans for a given input query, and attempts to determine which… …
2Query optimization — is a function of many relational database management systems in which multiple query plans for satisfying a query are examined and a good query plan is identified. This may or not be the absolute best strategy because there are many ways of doing …
3Query language — Query languages are computer languages used to make queries into databases and information systems. Broadly, query languages can be classified according to whether they are database query languages or information retrieval query languages. The… …
4Query plan — A query plan (or query execution plan) is a set of steps used to access or modify information in a SQL relational database management system. This is a specific case of the relational model concept of access plans.Since SQL is declarative, there… …
5Structured Query Language — SQL Apparu en 1974 Auteur Donald D. Chamberlin et Raymond F. Boyce Développeur IBM Dernière version stabl …
6Structured Query Language — Содержание 1 История 1.1 Вопросы совместимости 2 Преимущества и недостатки …
7Database — A database is an organized collection of data for one or more purposes, usually in digital form. The data are typically organized to model relevant aspects of reality (for example, the availability of rooms in hotels), in a way that supports… …
8Microsoft SQL Server — Developer(s) Microsoft Stable release SQL Server 2008 R2 (10.50.2500.0 Service Pack 1) / July 11, 2011; 4 months ago …
9Oracle Database — Developer(s) Oracle Corporation Development status Active Written in …
10Join (SQL) — An SQL join clause combines records from two or more tables in a database.[1] It creates a set that can be saved as a table or used as is. A JOIN is a means for combining fields from two tables by using values common to each. ANSI standard SQL… …
