Host variables can be used in the following circumstances:
In a SELECT, INSERT, UPDATE, or DELETE statement in any place where a number or string constant is allowed.
In the INTO clause of a SELECT or FETCH statement.
In CONNECT, DISCONNECT, and SET CONNECT statements, a host variable can be used in place of a user ID, password, connection name, or database name.
Host variables can never be used in place of a table name or a column name.
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