类别：: 数值函数（对数）

LN¶

返回数值表达式的自然对数。

语法¶

LN(<expr>)

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Returns¶

If the input expression is of type DECFLOAT, the returned type is DECFLOAT. Otherwise, the returned type is FLOAT.

示例¶

SELECT x, ln(x) FROM tab;

--------+-------------+
   X    |    LN(X)    |
--------+-------------+
 1      | 0           |
 10     | 2.302585093 |
 100    | 4.605170186 |
 [NULL] | [NULL]      |
--------+-------------+

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