(mssql_n): SELECT top 1 name FROM mdl_config WHERE name = 'unicodedb'
mssql_n internal transformation:
SELECT top 1 name FROM mdl_config WHERE name = 'unicodedb'
to
SELECT top 1 name FROM mdl_config WHERE name = N'unicodedb'
(mssql_n): SELECT * FROM mdl_config WHERE id = '-1'
4004: Unicode data in a Unicode-only collation or ntext data cannot be sent to clients using DB-Library (such as ISQL) or ODBC version 3.7 or earlier.