In the database system, which one of the following relational operations can extract entire rows from the relation table?
ASELECT正確答案
BEXTRACT
CPROJECT
DJOIN
答案與詳解
為什麼答案是 A
SELECT（選擇，Selection）運算在關聯代數中用於篩選出符合特定條件的完整橫列（tuples/rows），屬於水平方向的萃取，完全符合題意。
載入中…
