DESCRIBE EVENT TABLE¶

描述 :doc:` 事件表 </developer-guide/logging-tracing/event-table-setting-up>` 中的列。

DESCRIBE 可以缩写为 DESC。

另请参阅：: ALTER TABLE（事件表）、CREATE EVENT TABLE、SHOW EVENT TABLES

语法¶

DESC[RIBE] EVENT TABLE <name>

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参数¶

name: 指定要描述的事件表的标识符。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。

使用说明¶

此命令不显示表的对象参数。请改用 SHOW PARAMETERS IN TABLE ...。

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¶

描述名为 my_logged_events 的事件表中的列：

DESC EVENT TABLE my_logged_events;

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