DESCRIBE SCHEMA¶

描述架构。例如，列出架构中的表和视图。

DESCRIBE 可以缩写为 DESC。

另请参阅：

ALTER SCHEMA、CREATE SCHEMA、DROP SCHEMA、SHOW SCHEMAS、UNDROP SCHEMA

语法¶

DESC[RIBE] SCHEMA <schema_name>

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参数¶

schema_name: 指定要描述的架构的 :doc:` 标识符 </sql-reference/identifiers>`。

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.

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¶

此示例演示了 DESCRIBE SCHEMA 命令：

CREATE SCHEMA sample_schema_2;
USE SCHEMA sample_schema_2;

CREATE TABLE sample_table_1 (i INTEGER);

CREATE VIEW sample_view_1 AS
    SELECT i FROM sample_table_1;

CREATE MATERIALIZED VIEW sample_mview_1 AS
    SELECT i FROM sample_table_1 WHERE i < 100;

DESCRIBE SCHEMA sample_schema_2;

+-------------------------------+----------------+-------------------+
| created_on                    | name           | kind              |
|-------------------------------+----------------+-------------------|
| 2022-06-23 01:00:00.000 -0700 | SAMPLE_TABLE_1 | TABLE             |
| 2022-06-23 02:00:00.000 -0700 | SAMPLE_VIEW_1  | VIEW              |
| 2022-06-23 03:00:00.000 -0700 | SAMPLE_MVIEW_1 | MATERIALIZED_VIEW |
+-------------------------------+----------------+-------------------+

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