DESCRIBE TASK

Shows information about a task.

DESCRIBE 可以缩写为 DESC。

另请参阅：

DROP TASK、ALTER TASK、CREATE TASK、SHOW TASKS

语法

DESC[RIBE] TASK <name>
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参数

name

指定要描述的任务的标识符。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。

输出

The command provides the same output as SHOW_TASKS.

使用说明

  • 仅返回任务所有者（即对任务具有 OWNERSHIP 权限的角色）:emph:或者 对任务具有 MONITOR 或 OPERATE 权限的角色的行。

  • 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.

    For example, you can use the pipe operator or RESULT_SCAN function to select specific columns from the SHOW command output or filter the rows.

    When you refer to the output columns, use double-quoted identifiers for the column names. For example, to select the output column type, specify SELECT "type".

    You must use double-quoted identifiers because the output column names for SHOW commands are in lowercase. The double quotes ensure that the column names in the SELECT list or WHERE clause match the column names in the SHOW command output that was scanned.

示例

创建示例任务：

CREATE TASK mytask ( ... );
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Show information about the task:

DESC TASK mytask;
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For output examples, see SHOW_TASKS.

语言: 中文