What does SQL stand for?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of SQL & Databases conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
SQL stands for Structured Query Language.
Originally developed at IBM by Donald D. Chamberlin and Raymond F. Boyce in the early 1970s, it was initially named SEQUEL (Structured English Query Language) designed to manipulate and retrieve data stored in IBM's original relational database management system, System R.
### Key Aspects of SQL:
- Declarative Paradigm: Unlike imperative programming languages (where you write step-by-step algorithms), SQL is declarative—you describe *what* data you want, and the database query optimizer plans *how* to execute the retrieval.
- ANSI & ISO Standards: SQL became an ANSI standard in 1986 and an ISO standard in 1987. Major relational engines (PostgreSQL, MySQL, Oracle, SQL Server) adhere to core SQL standards while offering dialect-specific extensions.
- Core Language Subsets:
- DDL (Data Definition Language):
CREATE,ALTER,DROP,TRUNCATE - DML (Data Manipulation Language):
SELECT,INSERT,UPDATE,DELETE - DCL (Data Control Language):
GRANT,REVOKE - TCL (Transaction Control Language):
COMMIT,ROLLBACK,SAVEPOINT
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.