Language classification — evaluate the statement. "SQL is a data sublanguage."
-
AValid (SQL is widely described as a data sublanguage)
-
BInvalid (SQL is purely a general-purpose language)
-
CValid only in NoSQL systems
-
DValid only when embedded in C
-
EDepends on whether transactions are used
Answer
Correct Answer: Valid (SQL is widely described as a data sublanguage)
Explanation
Introduction / Context: SQL (Structured Query Language) is often characterized as a data sublanguage because it focuses on declaring data structures and performing data manipulation within a database rather than providing full general-purpose programming constructs like arbitrary looping and comprehensive I/O facilities. This question verifies that understanding.
Given Data / Assumptions:
- SQL defines data (DDL), manipulates data (DML), controls access (DCL), and manages transactions (TCL).
- SQL is designed to be used alone or embedded within host languages or tools.
- “Sublanguage” reflects scope limited to data concerns.
Concept / Approach: Unlike general-purpose languages (for example, Java, Python, C#), SQL is declarative for data access and definition. While some procedural extensions exist (PL/SQL, T-SQL), the core language is specialized for relational data tasks. Hence, describing SQL as a data sublanguage is accurate and common in academic and industry texts.
Step-by-Step Solution:
Identify SQL’s domain: defining and manipulating relational data.Recognize the lack of full general-purpose constructs in standard SQL.Acknowledge procedural extensions are outside the core.Conclude the statement is valid.Verification / Alternative check: Consult database textbooks and vendor documentation that routinely refer to SQL as a data sublanguage, often embedded or invoked via APIs/ODBC/JDBC.
Why Other Options Are Wrong:
- Claiming SQL is purely general-purpose ignores its domain specialization.
- Limiting to NoSQL, embedded cases, or transactions confuses usage patterns with classification.
Common Pitfalls: Equating T-SQL/PL-SQL procedural features with the SQL standard; believing that because SQL can express logic in queries it becomes a full GP language.
Final Answer: Valid (SQL is widely described as a data sublanguage)