类别：: 数值函数（三角函数）

TAN¶

计算其实参的正切值；实参应以弧度表示。

语法¶

TAN( <input_expr> )

实参¶

input_expr: The value or expression to operate on. The value must be in radians, not degrees. The data type must be FLOAT.

返回¶

This function returns a value of type FLOAT.

示例¶

SELECT TAN(0), TAN(PI()/3), TAN(RADIANS(90));

+--------+-------------+----------------------+
| TAN(0) | TAN(PI()/3) |     TAN(RADIANS(90)) |
|--------+-------------+----------------------|
|      0 | 1.732050808 | 1.63312393531954e+16 |
+--------+-------------+----------------------+