SQL - Find the closest price to a given argument

问题

I am trying to find the tuples which price is closest to a given parameter in SQL. Forexample: the parameter price = 6 would return id 1 and 2. Parameter price = 20 would return id 3.

Table :

ID     PRICE
1      5
2      5
3      10

SELECT id 
FROM Table
WHERE table.price ?? 6

Any Ideas how to do this?

Thank you.

回答1:

SELECT ID
FROM TableX
WHERE PRICE = @CheckPrice +
      ( SELECT MIN(ABS(PRICE - @CheckPrice))
        FROM TableX
      )
   OR PRICE = @CheckPrice -
      ( SELECT MIN(ABS(PRICE - @CheckPrice))
        FROM TableX
      )

or (probably better for performance):

SELECT ID
FROM 
    TableX
  CROSS JOIN
          ( SELECT 
                ( SELECT MIN(PRICE) - @CheckPrice
                  FROM TableX
                  WHERE PRICE >= @CheckPrice
                ) AS Pover 
              , ( SELECT @CheckPrice - MAX(PRICE)
                  FROM TableX
                  WHERE PRICE <= @CheckPrice
                ) AS Punder
            FROM dual
          ) AS tmp 
WHERE PRICE IN ( @CheckPrice + LEAST(Pover, Punder)
               , @CheckPrice - LEAST(Pover, Punder)
               )

回答2:

SELECT id, price
FROM thetable t1
WHERE NOT EXISTS ( SELECT *
   FROM thetable t2
   WHERE abs (t2.price - 6) < abs (t1.price - 6)
   );

回答3:

This query selects the closest price using the subquery, then returns all rows which match that price:

SELECT *
FROM Table
WHERE price = ( --could also use "WHERE price in" here...
    SELECT TOP 1 price FROM Table
    GROUP BY price
    ORDER BY Min(Abs(price - ?)))

回答4:

We are using UNION subquery to get closest prices for target price. In each subquery we get absolute delta (diff between each model price and target price) and ORDER BY delta in the end. Works pretty fast and stable. Hope it helps ;)

SET @CheckPrice = 3910;

(
    SELECT
        m_id,
        m_name,
        m_auto_price,
        m_auto_discount,
        ABS(m_auto_price - @CheckPrice)AS delta
    FROM
        s_models
    WHERE
        m_auto_price >= @CheckPrice
    ORDER BY
        m_auto_price ASC
    LIMIT 10
)
UNION
    (
        SELECT
            m_id,
            m_name,
            m_auto_price,
            m_auto_discount,
            ABS(m_auto_price - @CheckPrice)AS delta
        FROM
            s_models
        WHERE
            m_auto_price <= @CheckPrice
        ORDER BY
            m_auto_price DESC
        LIMIT 10
    )
ORDER BY
    delta ASC,
    m_auto_price DESC,
    m_auto_discount DESC

来源：https://stackoverflow.com/questions/7738459/sql-find-the-closest-price-to-a-given-argument

标签

mysql

sql

database

db2