Fix MSSQL tests

[Tigrov]

Related PR yiisoft/db#886

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.18%. Comparing base (3dde794) to head (17e140c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #389   +/-   ##
=========================================
  Coverage     85.18%   85.18%           
  Complexity      583      583           
=========================================
  Files            17       17           
  Lines          1404     1404           
=========================================
  Hits           1196     1196           
  Misses          208      208           

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