数据库表

About

Thing
在关系数据库,数据库表,又称表格,是一系列二维数组的集合,用来代表和储存数据对象之间的关系。表是构成表空间的基本结构,由区间构成。它由纵向的列和横向的行组成,例如一个有关作者信息的名为authors的表格中,每个列包含的是所有作者的某个特定类型的信息,比如“姓氏”,而每行则包含了某个特定作者的所有信息:姓、名、住址等等。 对于特定的数据库表,列的数目一般事先固定,各列之间可以由列名来识别。而行的数目可以随时、动态变化,每行通常都可以根据某个列中的数据来识别,称为候选键。
数据库表
Definition
在关系数据库,数据库表,又称表格,是一系列二维数组的集合,用来代表和储存数据对象之间的关系。表是构成表空间的基本结构,由区间构成。它由纵向的列和横向的行组成,例如一个有关作者信息的名为authors的表格中,每个列包含的是所有作者的某个特定类型的信息,比如“姓氏”,而每行则包含了某个特定作者的所有信息:姓、名、住址等等。 对于特定的数据库表,列的数目一般事先固定,各列之间可以由列名来识别。而行的数目可以随时、动态变化,每行通常都可以根据某个列中的数据来识别,称为候选键。
数据库表
数据库表
在关系数据库,数据库表,又称表格,是一系列二维数组的集合,用来代表和储存数据对象之间的关系。表是构成表空间的基本结构,由区间构成。它由纵向的列和横向的行组成,例如一个有关作者信息的名为authors的表格中,每个列包含的是所有作者的某个特定类型的信息,比如“姓氏”,而每行则包含了某个特定作者的所有信息:姓、名、住址等等。 对于特定的数据库表,列的数目一般事先固定,各列之间可以由列名来识别。而行的数目可以随时、动态变化,每行通常都可以根据某个列中的数据来识别,称为候选键。

See also

Eckher Dictionary is a modern pronunciation dictionary of the English language. Every pronunciation in Eckher Dictionary is written in IPA (International Phonetic Alphabet). Example English pronunciations: "Ursula von der Leyen".

Eckher's FHIR Viewer is an online tool for browsing FHIR stores. A FHIR store is a service that exposes a FHIR API and provides access to FHIR resources such as Patients, Observations, and more. Find out more about Eckher FHIR Viewer here.

Learn what every day of the week is called in Maori. For example, Monday is called Rāhina, Tuesday is Rātū, and so on.

Browse the full list of AWS services, products, tools, and resources.

Compose speech audio from IPA phonetic transcriptions using Eckher IPA to Speech.

How to embed YouTube into Markdown?

Send test emails with Eckher SMTP Testing Tool.

Eckher's Periodic Table of the Elements is the modern and accessible version of the periodic table that allows you to easily navigate all 118 elements and view detailed information about each element. It supports both the 18 column (IUPAC) and 32 column (long form) versions of the periodic table and provides the mobile- and touch-friendly interface for viewing the table.

Create sequence logos for protein and DNA/RNA alignments using Eckher Sequence Logo Maker.

Browse place name pronunciation on Eckher IPA Map.

Enter IPA characters using Eckher IPA Keyboard.

Navigate the Semantic Web and retrieve the structured data about entities published on the web using Eckher Semantic Web Browser.

Turn your phone into a compass using Eckher Compass.

Author, enrich, and query structured data using Eckher Database for RDF.

Create TeX-style mathematical formulas online with Eckher Math Editor.

Create knowledge graphs using Eckher RDF Graph Editor.

Send messages and make P2P calls using Eckher Messenger.

Build event-sourced systems using Eckher Database for Event Sourcing.

View PDB files online using Eckher Mol Viewer.

Listen to your text using Eckher Text to Speech.

View FASTA sequence alignments online with Eckher Sequence Alignment Viewer.

Convert Punycode-encoded internationalized domain names (IDNs) to Unicode and back with Eckher Punycode Converter.

Explore the human genome online with Eckher Genome Browser.

Edit text files online with Eckher Simple Text Editor.

В морфемном словаре русского языка МОРФЕМА.РУС приведен разбор слов по составу (морфемный разбор, морфемный анализ). Даный словарь поможет в проведении морфемного анализа не только начальных (словарных) форм слов, но и всех их словоформ (всех грамматических форм слов русского языка). В основу морфемного словаря "Морфема" положена наиболее полная лексика русского языка.

Разбор слов по составу (морфемный анализ) с выделением корня, суффикса, основы и окончания: "снова", "помощник", "вдали", "преспокойно", "упорно", "досыта", "беспредельный", "тотчас", "радость", "скоро".

Ударения в словах: "начав", "начавший", "начавшись", "приняв", "кормящий", "отдав", "отжим", "развитой", "закупорка", "кухонный", "севиче".

Синонимы к словам: "тактильность", "создать", "товарищ".

Антонимы к словам: "ликвидация", "дружить", "эмпатия", "шум", "пацифист", "глубокий", "доминант", "избыток", "любить".