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[]) are T-SQL specific, however,#is a very different story, as only--and/*...*/are the ANSI methods for comments.@is also the common theme for variables. The majority of this is not T-SQL specific. The misinterpretation of#as a comment is especially detrimental in my opinion.@. For example T-SQL (SQL Server), MySQL use@, where asPL\SQL (Oracle) and pgSQL (PostGreSQL) do not. SQLite doesn't actually support Variables at all; by the looks of it. I do admit that all the RDBMS using (vastly) varying implementations of SQL does pose many problem from the perspective of a generic "SQL" language implementation.