Error parsing column

Error parsing column 35 (DELETIONSTATECODE=2017-10-27 03:27:40 - DateTime) 在 Dapper.SqlMapper.ThrowDataException(Exception ex, Int32 index, IDataReader reader, Object value)
在 Deserializeaa7492ef-563f-4451-8cd2-a5d5f61a9f48(IDataReader )
在 Dapper.SqlMapper.d__1251.MoveNext() 在 System.Collections.Generic.List1..ctor(IEnumerable1 collection) 在 System.Linq.Enumerable.ToList[TSource](IEnumerable1 source)
在 Dapper.SqlMapper.Query[T](IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable1 commandTimeout, Nullable1 commandType)

in my Database table :

"DELETIONSTATECODE" => " NUMBER(1) " not " DateTime "

my code:
var conn= new System.Data.OracleClient.OracleConnection(connString);
conn.Open();
var result = conn.Query<T>(sql, param)

Why does this happen? There are often similar cases。Expected reply！thankyou very much!

Start with the reported Dapper.SqlMapper.ThrowDataException stack trace and inspect column 35, DELETIONSTATECODE, alongside the mapped type T and the Oracle table definition shown in the issue. A useful follow-up should explain the type-mapping behavior or provide a minimal reproducible case that confirms the cause.