宣言
LOG10(X)
説明
10を底とするXの指数を返します。
例
obclient> SELECT LOG10(1000);
+-------------+
| LOG10(1000) |
+-------------+
| 3 |
+-------------+
1 row in set
obclient> SELECT LOG10(-1000);
+--------------+
| LOG10(-1000) |
+--------------+
| NULL |
+--------------+
1 row in set, 1 warning