Transitive closure,an important operation for queries involving self-referencing relationships,is supported by most SQL implementations.

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Transitive closure is not directly supported by most SQL implementations as standard SQL lacks built-in functionality for recursive queries needed for computing transitive closure. However, some SQL extensions, like Common Table Expressions (CTEs) in SQL:1999, allow for recursion that can be used to implement transitive closure.

Transitive Closure,an Important Operation for Queries Involving Self-Referencing Relationships,is Supported