BigQuery SQL 使用表的描述來描述視圖

Question

我正在創建我在 BigQuery 中的表的視圖。

如何獲取表的描述並使其成為視圖的描述？

Answer 1

您可以使用INFORMATION_SCHEMA.TABLE_OPTIONS獲取表描述並將其設置為變量來執行此操作。

工作示例：

-- declare variable where we will later write the table description to
DECLARE view_description STRING;

-- create an example table that has a description
CREATE OR REPLACE TABLE `your_project.your_dataset.test_table_descriptions`
OPTIONS(description="Interesting table description")
AS SELECT 1 test_column;

-- get the table description and write it to the view_description variable
SET view_description = (
    SELECT option_value
    FROM `your_project.your_dataset.INFORMATION_SCHEMA.TABLE_OPTIONS`
    WHERE table_name = 'test_table_descriptions' and option_name = 'description');

-- create the view you want and within options use the view_description variable
CREATE OR REPLACE VIEW `your_project.your_dataset.test_table_descriptions2`
OPTIONS(description=(view_description))
AS SELECT 1 test_column_of_view;

有關INFORMATION_SCHEMA.TABLE_OPTIONS的更多信息：
https://cloud.google.com/bigquery/docs/information-schema-tables#table_options_view