顯示數據表擴充

適用於： Databricks SQL Databricks Runtime

顯示符合指定正則表示式之所有數據表的資訊。 輸出包含基本數據表資訊和檔案系統資訊，例如 Last Access、Created By、Type、Provider、InputFormatTable PropertiesLocationOutputFormatSerde LibraryStorage Properties、Partition Provider、 Partition Columns和 。Schema

如果資料分割規格存在，它會輸出指定的分割區的檔案系統特定資訊，例如 Partition Parameters 和 Partition Statistics。 您無法搭配資料分割規格使用資料表正則表示式。

注意

為了與 Apache Spark 相容，此命令會使用 Apache Spark 表示法來轉譯數據表數據行類型。 語言對應會 說明 SQL 的對應。 擷取數據表數據行資訊的其他方式包括 DESCRIBE TABLE，以及 Unity 目錄 INFORMATION_SCHEMA。數據行。

語法

SHOW TABLE EXTENDED [ { IN | FROM } schema_name ] LIKE regex_pattern
    [ PARTITION clause ]

參數

• schema_name

  指定架構名稱。 如果未提供，請使用目前的架構。

• regex_pattern

  用來篩選掉垃圾數據表的正則表達式模式。

  • *除了 和 | 字元以外，模式的運作方式就像正則表達式。
  • * 單獨比對 0 或多個字元，並 | 用來分隔多個不同的正則表示式，其中任何一個都可以比對。
  • 前置和尾端空白會在處理之前，先在輸入模式中修剪。 模式比對不區分大小寫。

• PARTITION 子句

  選擇性地指定分割區。 您無法搭配 PARTITION 子句使用數據表 regex 模式。

範例

-- Assumes `employee` table partitioned by column `grade`
> CREATE TABLE employee(name STRING, grade INT) PARTITIONED BY (grade);
> INSERT INTO employee PARTITION (grade = 1) VALUES ('sam');
> INSERT INTO employee PARTITION (grade = 2) VALUES ('suj');

-- Show the details of the table

> SHOW TABLE EXTENDED LIKE 'employee';
 database tableName isTemporary                          information
 -------- --------- ----------- --------------------------------------------------------------
 default  employee  false       Database: default
                                Table: employee
                                Owner: root
                                Created Time: Fri Aug 30 15:10:21 IST 2019
                                Last Access: Thu Jan 01 05:30:00 IST 1970
                                Created By: Spark 3.0.0
                                Type: MANAGED
                                Provider: hive
                                Table Properties: [transient_lastDdlTime=1567158021]
                                Location: file:/opt/spark1/spark/spark-warehouse/employee
                                Serde Library: org.apache.hadoop.hive.serde2.lazy
                                .LazySimpleSerDe
                                InputFormat: org.apache.hadoop.mapred.TextInputFormat
                                OutputFormat: org.apache.hadoop.hive.ql.io
                                .HiveIgnoreKeyTextOutputFormat
                                Storage Properties: [serialization.format=1]
                                Partition Provider: Catalog
                                Partition Columns: [`grade`]
                                Schema: root
                                  -- name: string (nullable = true)
                                  -- grade: integer (nullable = true)

-- show multiple table details with pattern matching
> SHOW TABLE EXTENDED  LIKE 'employe*';
 database tableName isTemporary                          information
 -------- --------- ----------- --------------------------------------------------------------
 default  employee  false       Database: default
                                Table: employee
                                Owner: root
                                Created Time: Fri Aug 30 15:10:21 IST 2019
                                Last Access: Thu Jan 01 05:30:00 IST 1970
                                Created By: Spark 3.0.0
                                Type: MANAGED
                                Provider: hive
                                Table Properties: [transient_lastDdlTime=1567158021]
                                Location: file:/opt/spark1/spark/spark-warehouse/employee
                                Serde Library: org.apache.hadoop.hive.serde2.lazy
                                .LazySimpleSerDe
                                InputFormat: org.apache.hadoop.mapred.TextInputFormat
                                OutputFormat: org.apache.hadoop.hive.ql.io
                                .HiveIgnoreKeyTextOutputFormat
                                Storage Properties: [serialization.format=1]
                                Partition Provider: Catalog
                                Partition Columns: [`grade`]
                                Schema: root
                                  -- name: string (nullable = true)
                                  -- grade: integer (nullable = true)

 default  employee1 false       Database: default
                                Table: employee1
                                Owner: root
                                Created Time: Fri Aug 30 15:22:33 IST 2019
                                Last Access: Thu Jan 01 05:30:00 IST 1970
                                Created By: Spark 3.0.0
                                Type: MANAGED
                                Provider: hive
                                Table Properties: [transient_lastDdlTime=1567158753]
                                Location: file:/opt/spark1/spark/spark-warehouse/employee1
                                Serde Library: org.apache.hadoop.hive.serde2.lazy
                                .LazySimpleSerDe
                                InputFormat: org.apache.hadoop.mapred.TextInputFormat
                                OutputFormat: org.apache.hadoop.hive.ql.io
                                .HiveIgnoreKeyTextOutputFormat
                                Storage Properties: [serialization.format=1]
                                Partition Provider: Catalog
                                Schema: root
                                  -- name: string (nullable = true)

-- show partition file system details
> SHOW TABLE EXTENDED  IN default LIKE 'employee' PARTITION (grade = 1);
 database tableName isTemporary                          information
 -------- --------- ----------- --------------------------------------------------------------
 default  employee  false       Partition Values: [grade=1]
                                Location: file:/opt/spark1/spark/spark-warehouse/employee
                                /grade=1
                                Serde Library: org.apache.hadoop.hive.serde2.lazy
                                .LazySimpleSerDe
                                InputFormat: org.apache.hadoop.mapred.TextInputFormat
                                OutputFormat: org.apache.hadoop.hive.ql.io
                                .HiveIgnoreKeyTextOutputFormat
                                Storage Properties: [serialization.format=1]
                                Partition Parameters: {rawDataSize=-1, numFiles=1,
                                transient_lastDdlTime=1567158221, totalSize=4,
                                COLUMN_STATS_ACCURATE=false, numRows=-1}
                                Created Time: Fri Aug 30 15:13:41 IST 2019
                                Last Access: Thu Jan 01 05:30:00 IST 1970
                                Partition Statistics: 4 bytes

-- show partition file system details with regex fail
> SHOW TABLE EXTENDED  IN default LIKE 'empl*' PARTITION (grade = 1);
 Error: TABLE_OR_VIEW_NOT_FOUND

相關文章

• CREATE TABLE
• DESCRIBE TABLE
• INFORMATION_SCHEMA。列
• INFORMATION_SCHEMA。表
• 分區