ABCDEFGHIJKLMNOPQRSTUVWXYZ
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Postgres
allows reserved keywords as "AS" column names - meaning that you can use them in syntactically unambiguous contexts:
SELECT x.CHECK FROM (SELECT 1 AS CHECK)x -- is fine, but:
SELECT CHECK FROM (SELECT 1 AS CHECK)x -- is an error, as well as:
SELECT x.CHECK FROM (SELECT 1 CHECK)x
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MSSQL
you can [use SQL Server reserved keywords as identifiers and object names in Transact-SQL scripts] only by using delimited identifiers.
Using reserved keywords as the names of variables and stored procedure parameters is not restricted.
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https://docs.microsoft.com/en-us/sql/relational-databases/databases/database-identifiers?view=sql-server-2017
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SQLite
https://www.sqlite.org/lang_keywords.html
four ways of quoting keywords in SQLite, including 'single quotes'
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