B Supported SQL Syntax and Functions
B.1 Supported SQL Statements
With a few exceptions, the gateway provides full support for Oracle DELETE, INSERT, SELECT, and UPDATE statements.
The gateway does not support Oracle data definition language (DDL) statements. No form of the Oracle ALTER, CREATE, DROP, GRANT, or TRUNCATE statements can be used. Instead, use the pass-through feature of the gateway if you need to use DDL statements against the Teradata database.
See Also:
Oracle Database SQL Language Reference for detailed descriptions of keywords, parameters, and options.
B.1.1 DELETE
The DELETE statement is fully supported. However, only Oracle functions supported by Teradata can be used.
See Also:
"Functions Supported by Teradata" for a list of supported functions.
B.1.2 INSERT
The INSERT statement is fully supported. However, only Oracle functions supported by Teradata can be used.
See Also:
"Functions Supported by Teradata" for a list of supported functions.
B.1.4 UPDATE
The UPDATE statement is fully supported. However, only Oracle functions supported by Teradata can be used. Also, you cannot have SQL statements in the subquery that refer to the same table name in the outer query. Subqueries are not supported in the SET clause.
See Also:
"Functions Supported by Teradata" for a list of supported functions.
B.2 Oracle Functions
All functions are evaluated by the Teradata database after the gateway has converted them to Teradata SQL.
B.2.1 Functions Not Supported by Teradata
Oracle SQL functions with no equivalent function in Teradata are not supported in DELETE, INSERT, or UPDATE statements, but are evaluated by the Oracle database if the statement is a SELECT statement. That is, the Oracle database performs post-processing of SELECT statements sent to the gateway.
If an unsupported function is used in a DELETE, INSERT, or UPDATE, statement, the following Oracle error occurs:
ORA-02070: database db_link_name does not support function in this context