There is syntactical difference in few operations in SQL in Oracel and Sql server
For example: UPDATE .. FROM
UPDATE students
SET grade='A'
FROM students s
INNER JOIN students_marks sm ON sm.student_id = s.student_id
WHERE sm.total_marks>80;
The above query syntax works in Sql Server but will fail in Oracle.
Below is the Oracle alternative.
UPDATE
(SELECT grade
FROM students s
INNER JOIN students_marks sm ON sm.student_id = s.student_id
WHERE sm.total_marks>80) t
SET t.grade='A';
Below is the block diagram for the Oracle query
