テクノロジ系 (Technology)

Glossary

Glossary
テクノロジ系 (Technology)Tested 3×

結合

けつごう · Join

Also known as: テーブル結合

A relational algebra operation that combines two or more tables horizontally using a common attribute (key) to produce a single result set. By joining tables linked through foreign keys, information stored across multiple tables can be retrieved in a single query. It is implemented as the JOIN clause in SQL SELECT statements and is commonly used alongside projection (column selection) and selection (row filtering).

Past questions testing this term · 3 questions

  • 2023r05 #100関係データベースにおける結合操作はどれか。
  • 2016h28h #95表1と表2に,ある操作を行って表3が得られた。行った操作だけを全て挙げたものはどれか。 表1 | 品名コード | 品名 | 価格 | メーカ | | --- |…
  • 2010h22a #87“部署”表,“都道府県”表及び“社員”表を結合して,A 表を作成した。結合した“社員”表はどれか。ここで,下線は主キーを示し,破線は外部キーを示す。 部署 |…
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