SEC
描述
返回 x 的正割值,x 为弧度值,仅支持输入输出为double。输入null值时会返回null。
语法
SEC(<x>)
参数
参数 | 说明 |
---|---|
<x> | 需要被计算正割值的值 |
返回值
返回一个 Double 类型的值表示 x 的正割值。
特殊情况
- 当
x
为NaN
,返回NaN
- 当
x
为正无穷或负无穷(±Infinity
),返回NaN
- 当
x
为NULL
,返回NULL
举例
select sec(1),sec(2),sec(1000);
+--------------------+--------------------+--------------------+
| sec(1) | sec(2) | sec(1000) |
+--------------------+--------------------+--------------------+
| 1.8508157176809255 | -2.402997961722381 | 1.7781600385912715 |
+--------------------+--------------------+--------------------+
输入null值。
select sec(null);
+--------------------+
| sec(null) |
+--------------------+
| NULL |
+--------------------+
select sec(cast('nan' as double));
+---------------------------+
| sec(cast('nan' AS DOUBLE))|
+---------------------------+
| NaN |
+---------------------------+
select sec(cast('inf' as double));
+---------------------------+
| sec(cast('inf' AS DOUBLE))|
+---------------------------+
| NaN |
+---------------------------+
select sec(cast('-inf' as double));
+----------------------------+
| sec(cast('-inf' AS DOUBLE))|
+----------------------------+
| NaN |
+----------------------------+