5.Having several instances of the same data is called data _______.
A: repetition
B: duplication
C: doubling
D: redundancy
A: repetition
B: duplication
C: doubling
D: redundancy
举一反三
- Which of the following is not the feature of a database. A: Data sharing B: Data integrity C: Data redundancy D: Data independence
- Suppose I have a data set called DATA and want to extract rows 1 to 10 and columns 5 to 7. What would be the relevant R command? A: DATA[1:10,5:7] B: DATA[5:7,1:10] C: DATA[10:1,7:5] D: DATA[7:5,10:1]
- Which of the following is NOT an advantage of using DBMS A: Data Integrity B: Data Security C: Evaluating a program D: Controlling Redundancy
- Detecting and correcting data in a database or file that are incorrect, incomplete, improperly formatted, or redundant is called: A: defragmentation. B: data scrubbing. C: data auditing. D: data optimization.
- Arrays are data structures consisting of related data items of the same __________.