同时选择倒数第二个mysql值

Question

I am trying to select the max mileage and the second biggest mileage from a table.

my query so far is:

SELECT oil.empid, oil.mileage, users.name, oil.date, MAX(oil.mileage)
FROM oil, users
WHERE oil.empid = users.empid
GROUP BY oil.empid
ORDER BY oil.mileage

but this selects the first mileage entered and the max.

how do i change this to get the second biggest mileage?

Answer 1

Basically do a normal query and sort it descending and limit it by 2. Something like the below (not tested)

SELECT
    oil.empid,
    oil.mileage,
    users.name,
    oil.date
FROM oil, users
WHERE (oil.empid = users.empid)
GROUP BY oil.empid
ORDER BY oil.mileage DESC
LIMIT 2

Answer 2

Try this: IF U need only the second last mileage then use this::

SELECT oil.empid, oil.mileage, users.name, oil.date, MAX(oil.mileage)
FROM oil, users
WHERE oil.empid = users.empid
GROUP BY oil.empid
ORDER BY oil.mileage desc
limit 1, 1

If u need both the max as well as the second last use this::

SELECT oil.empid, oil.mileage, users.name, oil.date, MAX(oil.mileage)
FROM oil, users
WHERE oil.empid = users.empid
GROUP BY oil.empid
ORDER BY oil.mileage desc
limit 2

Answer 3

A quick and dirt way to do it is to sort

ORDER BY oil.mileage DESC

and then

LIMIT 0, 2