SQL學習 - ROUND 對數值欄位值進行四捨五入計算

用法：
SELECT  ROUND(column_name, decimals)  FROM  table_name;

decimals用來設定要四捨五入到小數點第幾位，0表示個位數。

範例1：
SELECT ROUND(Price, 0) FROM orders;

範例2：
ROUND(125.315) would return 125
ROUND(125.315, 0) would return 125
ROUND(125.315, 1) would return 125.3
ROUND(125.315, 2) would return 125.32
ROUND(125.315, 3) would return 125.315
ROUND(-125.315, 2) would return -125.32