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Re:The Rule of Silence (2006) by mr_overalls on Tuesday December 13, 2016 @11:15AM (#13167872)
Oracle, for one, has had it for a long time.

"Use the COMMENT statement to add a comment about a table, view, materialized view, or column into the data dictionary."

https://docs.oracle.com/cd/B19306_01/server.102/b14200/state...

Re:The Rule of Silence (2006) by teddyh on Tuesday December 13, 2016 @02:46PM (#13170191)
Also PostgreSQL (since 7.0, released in 2000):

https://www.postgresql.org/docs/current/static/sql-comment.h...

Re:The Rule of Silence (2006) by Pxtl on Wednesday December 14, 2016 @07:31AM (#13175480)
Also mssql, the extended property ms_description can be applied to objects and columns and appears in SSMS as comments.