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Re:Announcing SQL Server on Linux by sixdimensional on Monday March 07, 2016 @04:22PM (#11241798)
Linked servers in Postgres can be implemented using foreign data wrappers (part of the SQL/MED implementation in Postgres - MED = management of external data which is actually in the SQL spec): https://wiki.postgresql.org/wiki/Foreign_data_wrappers
Re:Announcing SQL Server on Linux by dsp1234 on Monday March 07, 2016 @05:00PM (#11242087)
Which are super awesome!

but stuff like "Does not compile with PostgreSQL >= 9.2!", "A patched, but completely untested version", and "The current version does not yet support WHERE clause push-down, column push-down, JOIN push-down, or write operations."[0] are riskier (and a harder sell to management) than having the functionality backed in the core engine and admin interfaces.

[0] - https://github.com/GeoffMontee/tds_fdw