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描述架構

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適用于：核取標示為是 Databricks SQL 檢查標示為是 Databricks Runtime

傳回現有架構的中繼資料。 中繼資料資訊包括檔案系統上架構的名稱、批註和位置。 如果指定選擇性 EXTENDED 選項，也會傳回架構屬性。

雖然 和 的使用 SCHEMA 是可交換的， SCHEMA 但最好 DATABASE 使用 。

語法

{ DESC | DESCRIBE } SCHEMA [ EXTENDED ] schema_name

參數

  • schema_name：系統中現有架構的名稱 (架構) 。 如果名稱不存在，則會擲回例外狀況。

例子

-- Create employees SCHEMA
> CREATE SCHEMA employees COMMENT 'For software companies';

-- Describe employees SCHEMA.
-- Returns Database Name, Description and Root location of the filesystem
-- for the employees SCHEMA.
> DESCRIBE SCHEMA employees;
 database_description_item    database_description_value
 ------------------------- -----------------------------
             Database Name                     employees
               Description        For software companies
                  Location file:/you/Temp/employees.db

-- Create employees SCHEMA
> CREATE SCHEMA employees COMMENT 'For software companies';

-- Alter employees schema to set DBPROPERTIES
> ALTER SCHEMA employees SET DBPROPERTIES ('Create-by' = 'Kevin', 'Create-date' = '09/01/2019');

-- Describe employees SCHEMA with EXTENDED option to return additional schema properties
> DESCRIBE SCHEMA EXTENDED employees;
 database_description_item                    database_description_value
 ------------------------- ---------------------------------------------
             Database Name                                     employees
               Description                        For software companies
                  Location                 file:/you/Temp/employees.db
                Properties ((Create-by,kevin), (Create-date,09/01/2019))

-- Create deployment SCHEMA
> CREATE SCHEMA deployment COMMENT 'Deployment environment';

-- Describe deployment.
> DESCRIBE SCHEMA deployment;
 database_description_item database_description_value
 ------------------------- ------------------------------
             Database Name                     deployment
               Description         Deployment environment
                  Location file:/you/Temp/deployment.db