docs(mssql): clarify in comments and docs supports MS SQL versions (#…

…13989)

docs/manual/other-topics/dialect-specific-things.md

@@ -113,7 +113,11 @@ const sequelize = new Sequelize('database', 'username', 'password', {
 
 ### MSSQL
 
-The underlying connector library used by Sequelize for MSSQL is the [tedious](https://www.npmjs.com/package/tedious) npm package (version 6.0.0 or above).
+The supported versions of MS SQL are from MS SQL 2017 (version 14) up to the most recent version.
+
+#### Tedious
+
+The default underlying connector library used by Sequelize for MSSQL is the [tedious](https://www.npmjs.com/package/tedious) npm package.
 
 You can provide custom options to it using `dialectOptions.options` in the Sequelize constructor:
 

docs/manual/other-topics/upgrade-to-v7.md

@@ -30,3 +30,9 @@ sequelize.connectionManager.getConnection({ type: 'SELECT' });
 // Do this:
 sequelize.connectionManager.getConnection({ type: 'read' });
 ```
+
+### Microsoft SQL Server Support
+
+Sequelize v7 fully supports MS SQL Server 2017 (version 14) onwards, up from 2012 (version 13) in
+Sequelize v6, as this matches Microsoft's own [mainstream support](
+https://docs.microsoft.com/en-us/sql/sql-server/end-of-support/sql-server-end-of-life-overview?view=sql-server-ver15#lifecycle-dates).

lib/dialects/mssql/index.js

@@ -51,7 +51,13 @@ class MssqlDialect extends AbstractDialect {
   }
 }
 
-MssqlDialect.prototype.defaultVersion = '12.0.2000'; // SQL Server 2014 Express, minimum supported version
+// SQL Server 2017 Express (version 14), minimum supported version, all the way
+// up to the most recent version. When increasing this version, remember to
+// update also the minimum version in the documentation at
+//   docs/manual/other-topics/dialect-specific-things.md
+// and set the relevant years for the mssql Docker images in the ci.yml file at
+//   .github/workflows/ci.yml
+MssqlDialect.prototype.defaultVersion = '14.0.1000';
 MssqlDialect.prototype.Query = Query;
 MssqlDialect.prototype.name = 'mssql';
 MssqlDialect.prototype.TICK_CHAR = '"';