Retrive Records From Oracle DB

Since you have Excel 2016, there are number of options available to you.

1. ADODB using VBA
2. PowerQuery (I believe you'd need ProPlus license for Oracle Import).
3. MS Query.

Exact method will depend on what sort of permission you have on the database etc.

Using MS Query, you can load data from Excel (list of KW_Value) then also bring data from Oracle, left join Oracle data onto KW_Value. Row with no record will show null.
You can then replace null with your desired string.

But my preferred method is to use PQ by passing on KW_Value as variable(s) in SQL statement (using IN Clause), then doing left join using subset only.

Simple method using ADODB is to pass each value in column A as variable in query and check if record set returns empty or not. Or you can bring in Oracle data, and then loop through recordset to check.
Which method is more efficient will depend on size of your db table.