SQL Reserved Keywords

	A	B	C
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2	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
3	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.
4	https://docs.microsoft.com/en-us/sql/relational-databases/databases/database-identifiers?view=sql-server-2017
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8	SQLite	https://www.sqlite.org/lang_keywords.html	four ways of quoting keywords in SQLite, including 'single quotes'
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