In ad hoc query scenarios, such as SELECT FROM EXTERNAL TABLE, PolyBase stores the rows that are retrieved from the external data source in a temporary table. After the query completes, PolyBase removes and del
CREATE EXTERNAL TABLE AS SELECT (CETAS) creates an external table and then exports, in parallel, the results of a T-SQL SELECT statement.
In ad hoc query scenarios, such as SELECT FROM EXTERNAL TABLE, PolyBase stores the rows that are retrieved from the external data source in a temporary table. After the query completes, PolyBase removes and deletes the temporary table. No permanent data is stored in SQL tables. ...
sys.external_tables (Transact-SQL)项目 2025/01/03 5 个参与者 反馈 本文内容 权限 另请参阅 适用于: SQL Server 2016 (13.x) 及更高版本Azure SQL 数据库 Azure SQL 托管实例 Azure Synapse Analytics 分析平台系统 (PDW)包含当前数据库中每个外部表的行。
In serverless SQL pools, external tables can't be created in a location where you currently have data. To reuse a location that has been used to store data, the location must be manually deleted on ADLS. For more limitations and best practices, see Filter o...
When you try to apply a security policy on a PolyBase external table in SQL Server 2019, you may encounter an error message that resembles "Security predicates can only be added to user tables and schema bound views". With this fix, you can create a security policy on PolyBase...
When you try to apply a security policy on a PolyBase external table in SQL Server 2019, you may encounter an error message that resembles "Security predicates can only be added to user tables and schema bound views". With this ...
If you create Hologres external tables by using the STS mode, MaxCompute is intercepted by the IP whitelist when accessing Hologres. The names of the parent and child tables in a Hologres database are specified in Hologres external tables. SQL statements can be executed on the Hologres external...
Hadoop tables in Synapse dedicated SQL pools enable you to specify one or more characters in STRING_DELIMITER. In serverless SQL pool, you can use only one character. Examples: STRING_DELIMITER = '"' STRING_DELIMITER = '0x22'(Double quote hex) ...
You may find it helpful to use theEXTERNAL_TABLE=GENERATE_ONLYparameter in SQL*Loader to get the proper access parameters for a given SQL*Loader control file. When you specifyGENERATE_ONLY, all the SQL statements needed to do the load using external tables, as described in the control file,...