Syntax 引數 備註 可更新的檢視 顯示其他 9 個 適用於:SQL Server Azure SQL 資料庫 Azure SQL 受控執行個體Azure Synapse Analytics Analytics Platform System (PDW) SQL 分析端點在 Microsoft Fabric SQL 資料庫中Microsoft網狀架構倉儲中的 SQL 分析端點Microsoft網狀架構 建立由查詢定義其內容 (資料行和資...
Databricks SQL Databricks Runtime 與產生器函式搭配使用,例如EXPLODE,其會產生包含一或多個數據列的虛擬數據表。LATERAL VIEW會將數據列套用至每個原始輸出數據列。 在Databricks SQL 中,從 Databricks Runtime 12.2 開始,這個子句已被取代。 您應該將表格值生成器函數作為table_reference來使用。
又因为lateral view + explode是笛卡尔积的形式,会翻倍数据量(abc),所以加了个posexplode,相当于给每个虚拟表加了个主键,然后就可以用这个主键来关联,可以减少数据量,避免笛卡尔积。 syntax 使用2个函数 lateral view 和explode lateral view explode(split(column_name, ‘,’)) new_column_name lateral view expl...
This is the third article in a series of learning the CREATE VIEW SQL statement. So far, I’d say that we’re comfortable and familiar with the syntax, and we’ve learned how to create and modify views. In this part, we’ll continue to work on views using the sample database and d...
具体化视图不支持标识列或代理项键。 具体化视图不支持OPTIMIZE和VACUUM命令。 维护是自动进行的。 具体化视图不支持定义数据质量约束的预期。 示例 SQL复制 -- Create a materialized view if it doesn't exist>CREATEMATERIALIZEDVIEWIFNOTEXISTSsubscribed_moviesASSELECTmo.member_id, mb.full_name, mo....
Databricks SQL Databricks Runtime 13.3 LTS 及更高版本 tag_name 文本STRING。tag_name在视图中必须唯一。 tag_value 文本STRING。 示例 SQL复制 -- Rename only changes the view name.-- The source and target schemas of the view have to be the same.-- Use qualified or unqualified name for the ...
Microsoft Fabric 中的 SQL 分析端点 Microsoft Fabric 中的仓库 修改先前创建的视图。 其中包括索引视图。 ALTER VIEW 不影响相关的存储过程或触发器,并且不会更改权限。 Transact-SQL 语法约定 语法 syntaxsql ALTERVIEW[schema_name. ]view_name[ ( column [ ,...n ] ) ] [WITH<view_attribute>[ ,...n...
A partitioned view is a view defined by a UNION ALL of member tables structured in the same way, but stored separately as multiple tables in either the same instance of SQL Server or in a group of autonomous instances of SQL Server servers, called federated database servers. ...
Syntax create_materialized_view::= Description of the illustration create_materialized_view.eps (scoped_table_ref_constraint::=, physical_properties::=, materialized_view_props::=, physical_attributes_clause::=, create_mv_refresh::=, evaluation_edition_clause::=, query_rewrite_clause::=, subq...
To create the view explicitly in a given database, use db_name.view_name syntax to qualify the view name with the database name: CREATE VIEW test.v AS SELECT * FROM t; Unqualified table or view names in the SELECT statement are also interpreted with respect to the default database. ...