基礎ict-u05-d02
A primary key uniquely:
A. Identifies each record in the table✓ 答案
B. Duplicates every row in the table
C. Stores only image files
D. Sorts the records automatically by date
解說
A primary key gives each record a unique identifier with no repeats and no blanks, which is what allows a record to be located and related to others safely.