距離平均值最近SQL

Question

我正在尋找一個查詢來獲取最接近的值存在的所有值的平均值。 例如， 我在A列中的值 - 1,2,8 平均值是3.667。所以我想查詢返回2，因爲它是最接近平均值。

Answer 1

SELECT TOP 1 myTable.* 
FROM myTable 
CROSS JOIN (SELECT AVG(A) AS averageA FROM myTable) AS averageA 
ORDER BY ABS(averageA.averageA - myTable.A) 

SQL Fiddle

Answer 2

SELECT number, ABS(number - (SELECT AVG(number) FROM numberTable)) AS deviation 
FROM numberTable 
ORDER BY deviation ASC 
LIMIT 1; 

Answer 3

SELECT MAX(A) 
FROM myTable 
WHERE A < (SELECT AVG(A) AS averageA FROM myTable)