Selection is a fundamental operation in relational algebra used in relational databases to extract only the rows (records) from a table that satisfy a specified condition. Unlike projection, which filters columns, selection filters rows. In SQL, it corresponds to filtering records using the WHERE clause. It is also referred to as filtering.

Past questions testing this term · 1 questions

• 2013h25h #67関係データベースの“商品”表から価格が100円以上の商品の行（レコード）だけを全て抽出する操作を何というか。 商品 | 商品番号 | 商品名 | 価格（円） |…