Is there any difference between "!=" and "<>" in Oracle Sql?
Indeed, both != and <> are interchangeable and represent "not equal to" in Oracle SQL. There's absolutely no functional difference, the choice boils down to your syntax preference. Globally, <> has wider recognition since it aligns with the ANSI SQL standard. Both can be used in queries as:
Both operators yield the identical result. So, your choice depends on readability or your team's or project's coding standards.
Complete set of inequality operators in Oracle
In fact, Oracle SQL provides four operators for not equal to: <>, !=, ^=, and ¬=, ranging from most to least commonly used.
| Operator | Alternative Name |
|---|---|
<> | Standard Notation |
!= | Common Alternative |
^= | Uncommon Version |
¬= | Obscure Variant |
All of them result in identical outcomes in comparisons.
Historical backdrop and coding standards
The usage of != and <> has historical context. < and > are from the inception of computer character sets. Being visually complementary, <> became a natural symbol for not equals.
Concerning style and standards, using <> can aid with code portability across differing SQL databases that strictly comply with the ANSI SQL standards. However, coders coming from programming backgrounds where != is ubiquitous might favor it for consistency.
Debunking performance myths and considerations for DB optimization
When discussing performance between != and <>, it's crucial to dispel the myths as there's no empirical evidence to suggest a difference. Any claims about != being more efficient are invalid and should not influence your choice.
One important caveat for those who are optimizing at the level of stored outlines or cached queries. Being functionally identical doesn't mean you can interchange the operators without consequences. Even a slight variation can cause Oracle to generate a new execution plan, adding unnecessary overhead.
A dive into interoperability and best practices
For those dabbling in a multi-database environment or foreseeing a code migration, considering interoperability is wise. <> holds merits here, being an ANSI SQL standard element can make your journey smoother.
As for best practices, Oracle SQL doesn't advocate a specific operator. The focus lies more on team norms, personal preference, and the consistency of operator usage throughout your codebase.
The role of choice in code clarity
Sometimes, the choice between != and <> is governed by design and readability factors. User-defined functions, triggers, or complex SQL queries may favor one operator over another based on visual cues provided by the operators.
In context of code reviews and team collaborations, the operator chosen could impact semantic clarity, depending on the familiarity of your team with SQL dialects.
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