A developer stores dates of birth in a text column as “12/03/1995”. Why is a DATE column better?
Un développeur stocke les dates de naissance dans une colonne texte sous la forme « 12/03/1995 ». Pourquoi une colonne DATE est-elle préférable ?
Answers
ADates are validated and sort and compare correctly as datesLes dates sont validées, et se trient et se comparent correctement en tant que dates
BText columns cannot hold any numbers at all, including the digits of a dateLes colonnes texte ne peuvent contenir aucun chiffre, pas même ceux d'une date
CDATE columns are always encryptedLes colonnes DATE sont toujours chiffrées
DIt makes the table smaller than one byteElle rend la table plus petite qu'un octet
The answer and explanation are in the full bank.
This question is one of 2,831 in the paid banks. Each comes with the correct answer and the reasoning behind it, not just a mark.
Unlock for 5,000 RWFMIFOTRA exam practicealigned to Practice set: Database Management·2 marks·Medium
More Database questions
- What is the main role of a database management system (DBMS) such as PostgreSQL, MySQL or SQL Server?
- In a relational table called Applicants, what does a single row represent?
- Which two properties must every primary key value have?
- The Employees table has a DistrictID column that must always refer to an existing row in the Districts table. What enforces this rule?
- An ExamResults table records one score per candidate per paper. Neither CandidateID nor PaperID is unique on its own. What is a suitable primary key?
- A designer gives each applicant an auto-generated ApplicantID as the primary key, and stores the national ID number as a separate unique column. Why use this surrogate key?
- One district has many sectors, and each sector belongs to exactly one district. What type of relationship is this?
- Each trainee can attend many courses, and each course has many trainees. How is this relationship stored in a relational database?