ORACLE N 'query condition resulted from the index-CodePudding

Environment:
ORACLE 11.2.0.4.0
. Netcore2.2 EFCORE

SQBH field type for varchar2
Create index statement

 the CREATE INDEX SQBHINDEX2021 ON TABLE (SQBH)

Efcore automatically generated SQL query with N index when failure

 SELECT * FROM TABLE "" WHERE" d ". "SQBH" IN (N '330281102001', N '330281102200')

SQL query without N index when effective

 SELECT * FROM TABLE "" WHERE" d ". "SQBH" IN (' 330281102001 ', '330281102200')

With N implicit conversion to NVARCHAR2, index failure
A manual writing SQL directly, this need not EFCORE.
Use EFCORE how to specify the SQBH field under the condition of without N
Or get indexed effective