Oracle滞后函数

Posted 2021-02-22

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A few examples of the LAG function.

SELECT * FROM student;
 
--Example 1
SELECT student_id, first_name, last_name, fees_required,
LAG(fees_required) OVER (ORDER BY fees_required ASC) AS prev_fees_required
FROM student
ORDER BY student_id ASC;
 
--Example 2
SELECT student_id, first_name, last_name, fees_required,
LAG(fees_required) OVER (ORDER BY fees_required ASC) AS prev_fees_required
FROM student
ORDER BY fees_required ASC;
 
--Example 3
SELECT student_id, first_name, last_name, fees_required,
LAG(fees_required, 3, 0) OVER (ORDER BY fees_required ASC) AS prev_fees_required
FROM student
ORDER BY fees_required ASC;

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Oracle滞后函数

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