php - PHP中如何获取Mysql查询结果中最小值列的字段名

Question

我有一个结果集如下。我想获得 Lowest/Least/Minimum Value 的名称。在下图中，最低的是“14”，字段的名称是 Sum(c.2)。那么我怎样才能得到像 "Sum(c.2)"这样只有最小值/最大值的字段名呢？

Answer 1

我认为这很适合你。

SELECT @LeastVar:= LEAST(`sum(c.0)`, `sum(c.1)`, `sum(c.2)`, `sum(c.3)`, `sum(c.4)`, `sum(c.5)`, `sum(c.6)`, `sum(c.7)`, `sum(c.8)`, `sum(c.9)`) AS LeastVar,
   CASE @LeastVar WHEN `sum(c.0)` THEN 'sum(c.0)'
                  WHEN `sum(c.1)` THEN 'sum(c.1)'
                  WHEN `sum(c.2)` THEN 'sum(c.2)'
                  WHEN `sum(c.3)` THEN 'sum(c.3)'
                  WHEN `sum(c.4)` THEN 'sum(c.4)'
                  WHEN `sum(c.5)` THEN 'sum(c.5)'
                  WHEN `sum(c.6)` THEN 'sum(c.6)'
                  WHEN `sum(c.7)` THEN 'sum(c.7)'
                  WHEN `sum(c.8)` THEN 'sum(c.8)'
                  WHEN `sum(c.9)` THEN 'sum(c.9)'
       END AS LeastVarColumn
   FROM result_set