Query of SQL Server Integer fields and null Fields

The phenomenon is as follows: The inttype field is an integer.
Select * from test where varchartype = 'test' and inttype =''
Records with inttype 0 can be found.
Update Test Set dcr_times = ''. The value of test is 0.

Differences between Oracle and sqlserver:

Insert into Table1 (a, B) values (null ,'');
The values of column A inserted into the record in Oracle and column B are both null)
The value of column A inserted into the record in sqlserver is null, and the value of Column B is the default value. The default value is an empty string for the char/varchar type, the value type is 0, and the date or time type is 1900-01-01: 00: 00: 00.