SQL 选择所有列的最大值

Question

查询：

SELECT 
    itemcode, whsecode, MAX(quantity)
FROM
    inventoryTable
WHERE
    itemcode = 'FG 4751'
GROUP BY 
    itemcode;

它returns这个错误：

Column 'inventoryTable.whsecode' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

当我将 whsecode 放在 GROUP BY 子句中时，它只是 returns 所有或多行带有项目代码 'FG 4751':

我需要的输出是

FG 4751|WHSE3|100

Answer 1

SELECT TOP 1 * 
FROM inventoryTable 
WHERE itemcode = 'FG 4751'
ORDER BY quantity DESC

Answer 2

理查德-

不确定是否计划在某个时候将其用于多个项目代码。这可以使用 window 函数 -

来实现

WITH HIGH_RANK AS(
SELECT 
    itemcode, 
    whsecode, 
    quantity,
    RANK(quantity) OVER (PARTITION BY itemcode ORDER BY quantity DESC) AS MAX_RANK
FROM
    inventoryTable)

SELECT
    itemcode,
    whsecode,
    quantity
FROM HIGH_RANK
WHERE MAX_RANK = 1

-RANK(数量) OVER (PARTITION BY itemcode ORDER BY quantity DESC) AS MAX_RANK

在所有数量等于最大值的情况下，使用等级将离开，如果您只想要一个值，请将 RANK 换成 ROW_NUMBER

Answer 3

SELECT * FROM inventoryTable 
WHERE itemcode = 'FG 4751'
ORDER BY MAX(quantity) DESC LIMIT 1

SQL 选择所有列的最大值

SQL selecting the maximum value with all the column

sql

group-by

max