This is a modified version of the original post found here. Below is the standard operations (SELECT, INSERT, UPDATE & DELETE) used in T-SQL backend operations.

SQL Queries tested on Microsoft SQL 2008 R2

SELECT Statement

-- W/o Parameter(s)

SELECT * FROM OPENQUERY (OracleSvr, 'SELECT name FROM JOBS');

-- W/ Parameter(s)

DECLARE @name nvarchar(max) = 'John'; 
SELECT * FROM OPENQUERY (OracleSvr, 'SELECT name FROM JOBS WHERE name = '' + @name + '' ');

INSERT Statement

INSERT OPENQUERY (OracleSvr, 'SELECT * FROM JOBS')  
VALUES 
(
'John'       -- First Name
,'Doe'       -- Last Name
,'Mortician' -- Title
,'INACTIVE'  -- Status
);  

UPDATE Statement

SELECT * FROM OPENQUERY (OracleSvr, 'SELECT * FROM JOBS WHERE Title = ''Mortician''')
SET Title = 'Grave Digger'

Delete Statement

DELETE OPENQUERY (OracleSvr, 'SELECT * FROM JOBS WHERE Id = 1');