ANSI-92 SQL: Why the Lag Behind ANSI-89?
Overview:
While ANSI-92 SQL offers significant improvements, many organizations persist in using the older ANSI-89 standard. This article investigates the reasons for this continued reliance on outdated syntax and assesses whether ANSI-92 provides tangible performance gains.
Benefits of ANSI-92:
-
Enhanced Readability: The introduction of the
JOIN
keyword in ANSI-92, coupled with table aliases, dramatically improves the clarity and understandability of SQL queries. -
Simplified Outer Joins: ANSI-92's approach to outer joins is far more intuitive than the Oracle
( )
syntax.
Performance Impact:
Based on the findings in Gulutzan and Pelzer's "SQL Performance Tuning," there's generally no performance difference between ANSI-89 and ANSI-92 join syntax. Database systems typically translate both into an internal format before processing, making the surface-level syntax insignificant for optimization.
Obstacles to Wider Adoption:
- Reliance on Legacy Code: Many developers continue to use ANSI-89 due to readily available code examples and snippets from older projects.
- Habitual Coding Practices: Memorized coding patterns, rather than a deep understanding of SQL principles, can hinder the transition to the newer standard.
- Resistance to Change: Organizations may be reluctant to adopt new standards due to potential disruptions to existing workflows and established practices.
Promoting ANSI-92 Adoption:
Despite these obstacles, promoting ANSI-92 is vital. Its superior readability and consistency lead to higher code quality and improved collaboration among developers. By highlighting these advantages, we can foster a more efficient and standardized SQL development environment.
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