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If you notice error 7318, this user guide can help you.
Practitioner 
Description: OLE DB for linked server ‘%ls’ ‘%ls’ returned an invalid column definition for table ‘%ls’.
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Server error 7000-7999
Bound OLE DB provider ‘%ls’ for ‘%ls’ … Database bound OLE DB provider for server ‘%ls'” %ls”. returned an invalid built-in index definition ‘%ls’ for …7000
error 7999
OLE-DB Corporation ‘%ls’ returned an invalid column definition. 7319th of sixteen… Link schema server version converted. Run a new request. 7601. 16 …8000
example of error 8999
Table value parameter (“% %d.*ls”), .strip .%I64d, .column. %d: .Type .data .0x%02X …. Native server client (SQLNCLI) to connect to SQL server via linked server ‘%.*ls’ …
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OLE DB error ‘%ls’.for linked server ‘%ls’…The ole provider database ‘%ls’ for linked server ‘%ls’ has an invalid index definition range specified for ‘%ls’ …7000
Error – 7999
Ole DB site definition ‘%ls’ returned an invalid column. 7319. 06 … Changed schema linked server version a. Run a new request. 7601. 16 …8000
Error 8999
parameter table %d (space (“%.string *ls”), %I64d, %d: enter column 0x %02X data … Native server client (SQLNCLI) to connect to SQL server via linked server “%.*ls” …
The path uses the OPENQUERY function because your associated one is an Oracle server: the four-name syntax works great for MSSQL servers, mainly because they support T-SQL.
For very simple queries, a 4-part name might work, but mistakenly it won’t work in most cases when you’re in a real setup. In your case, the intended SELECT * returns all columns, and in your surprising case, one of the column definitions is simply SQL incompatible with Server. Try an alternative or table. They are trying to single out a specific person. One column (like CHAR one or some NUMBER) might work
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If this usage is distributed queries can sometimes be tricky. The database performs optimization itself before executing commands. So, it’s great that the database knows what data it can and can’t do. If the database thinks the linked server is just MSSQL, it will take certain actions that cannot work with Oracle.
If you use a two-part naming syntax with an associated database that differs from mssql, you will also run into other problems, such as using built-in functions to retrieve information (for example, to_date( ) Oracle doesn’t want to work because MSSQL really wants to use its own convert() function, albeit an extremely active one).
So, if the linked server is usually not MSSQL, the correct choice can be described as using AND openquery and passing a specific query to it using a syntax that is legal and which is contrary to the linked server’s SQL dialect.
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