Without a version of Jira, the answer is maybe. For anything below JIRA 7.1, no MS SQL 2014 is not supported. For JIRA 7.1, yes MS SQL 2014 is supported.
For older version of Jira:
https://confluence.atlassian.com/jira/supported-platforms-207488170.html
Newer versions of Jira:
https://confluence.atlassian.com/adminjiraserver070/supported-platforms-749382629.html
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