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Is there an official SQL standard? I.e. I want to understand what type of expression is supported by SQL language and how this expression evaluated by server? What documents are using for implementation SQL based databases?
There is an official SQL standard from the ISO/ANSI committee.
Some information can be found here: http://en.wikipedia.org/wiki/Sql
However the specification itself is not freely available. You might find some drafts of older specs in the internet if you search for it.
A nice explanation of the (yet a bit old) ANSI 99 standard is here: https://mariadb.com/kb/en/sql-99-complete-really/
Here is a compilation of at least the BNF syntax for various versions of the standard
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I just started using Amazon Athena and I can make simple SELECT statements, but it's clearly not T-SQL. What database is Athena based on, at least for the SQL query portion?
Athena supports ANSI SQL, as does almost every other SQL database.
T-SQL is Microsoft’s extension to ANSI SQL that provides some programming capabilities - similar to PL/SQL in Oracle.
As T-SQL is proprietary to MS, it’s not surprising that an AWS product doesn’t support it.
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Inspired by how much of an improvement the MDC Javascript/DOM docs are over W3Schools, I was looking for a similar wiki comparable to the W3Schools SQL documentation today. I haven't had much luck.
Is there a wiki documenting all the SQL commands with common-use examples, caveats, and vendor-dependent implementations?
The best documentation usually comes from the source itself. Which documentation you want depends on your RDBMS:
MS SQL Server Transact-SQL Reference or Index
PostgreSQL SQL Syntax
SQLite SQL Syntax with pretty railroad diagrams
MySQL SQL Syntax
Oracle SQL Reference
Edit: Based on your updated question, the answer is "What you want does not exist."
Based on your SQL Server tag, you might want to check out MSDN. Vendors usually maintain decent doc themselves (see MySQL and Oracle 10g)
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Does anyone know of a newer standard for software interface specifications than IEEE J-STD 16 1995? I have been searching the web and the IEEE site and have not found anything, but may not be using the right combination of words in my searches.
I believe the standard that replaced J-STD-016-1995 was IEEE 12207.
The standards that defined the Software Life Cycle Process evolved in the following order:
MIL-STD-2167 (1988) & MIL-STD-7935A (1988)
MIL-STD-498 (1994)
J-STD-016-1995 (1995)
IEEE/EIA 12207 (1998)
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From all of the information that I have been able to gather, this is the best standard. There are others out there or I could create my own format, but this one seems to be the most accepted....for anyone who wishes to know an answer to this question.
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Details on the packages/types is in the Scala API documentation on scala-lang.org. But that's organised by class and I (as a Scala neophyte) find it difficult to locate the exact data type I need and work out what operation are supported on what (especially in the huge and powerful scala.collections.* tree).
Is there an online or dead-tree resource that either presents this reference information more usably, or guides the reader through the library?
Alternatively, maybe I just need to be informed how to use the existing Scala API doc website more effectively.
Any advice on effective use of the standard Scala library gratefully received!
For the collections in particular, there's a very good overview available here: http://www.scala-lang.org/docu/files/collections-api/collections.html
Written by Martin Odersky himself :)
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Does anybody know about good SQL parser with sources, written in Delphi? I need in parsing SQL commands (with all new features of Firebird 2.5) into object structure.
Read this article for Delphi SQL Parser, it uses IB as database but should not be very different between it and FB.
And there's an open source project called SQL Parser for Delphi but hasn't updated since 2005, but it may give you start up point.
2 other native Delphi SQL parsers:
Zeoslib seems to have an sql parser to parse Interbase, MySQL, Oracle, Postgres, SqLite and Sybase.
General SQL Parser (commercial)