I see JIRA 7.12 supports MS SQL 2016, https://confluence.atlassian.com/adminjiraserver/supported-platforms-938846830.html.
Unfortunately none of the JIRA versions support MSSQL 2017 yet. You can vote up a suggestion to have JIRA support 2017 by going here: https://jira.atlassian.com/browse/JRASERVER-66320?_ga=2.96547615.1495013249.1537799684-188448510.1531496950
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