DESCRIBE FUNCTION

描述指定的用户定义函数 (UDF) 或外部函数,包括签名(如实参)、返回值、语言和正文(如定义)。

DESCRIBE 可以缩写为 DESC。

另请参阅:

DROP FUNCTIONALTER FUNCTIONCREATE FUNCTIONSHOW USER FUNCTIONSSHOW EXTERNAL FUNCTIONS

语法

DESC[RIBE] FUNCTION <name> ( [ <arg_data_type> ] [ , ... ] )
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参数

name

指定要描述的函数的标识符。如果标识符包含空格或特殊字符,则整个字符串必须放在双引号内。放在双引号内的标识符也区分大小写。

arg_data_type [ , ... ]

指定函数的实参(如果有)的数据类型。实参数据类型是必需的,因为函数支持名称重载(即同一架构中的两个函数可以具有相同的名称),并且实参数据类型用于标识函数。

使用说明

  • To post-process the output of this command, you can use the pipe operator (->>) or the RESULT_SCAN function. Both constructs treat the output as a result set that you can query.

    The output column names for this command are generated in lowercase. If you consume a result set from this command with the pipe operator or the RESULT_SCAN function, use double-quoted identifiers for the column names in the query to ensure that they match the column names in the output that was scanned. For example, if the name of an output column is type, then specify "type" for the identifier.

示例

此示例演示了 DESCRIBE FUNCTION 命令:

DESC FUNCTION multiply(number, number);

-----------+----------------------------------+
 property  |              value               |
-----------+----------------------------------+
 signature | (a NUMBER(38,0), b NUMBER(38,0)) |
 returns   | NUMBER(38,0)                     |
 language  | SQL                              |
 body      | a * b                            |
-----------+----------------------------------+
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语言: 中文