You create database views for convenience and for performance. When view performance is not enough the next step is creating materialized views. Before turning to materialized views, you should first explore all the performance tweaks you can do to normal MySQL views. For example, you could impro...
意思就是:如果是build deferred+on commit,那么 创建mv后,mv的status是37(fast/force)/38(complete),即无法自动刷新,再怎么commit主表,mv数据也不会丝毫改动。 此时,必须手工执行EXEC Dbms_Mview.refresh('MV_NEWLINES',method=>'COMPLETE');完成一次complete刷新,mv才能生效 status变为3(fast/force)/2(complete...
SQL table macros are expressions found in a FROM clause that acts as a polymorphic or parameterized view. Let’s look at how this can help us with the view we need to create to find the details about orders waiting to ship, which have a total value of $100 or more. Creating a SQL ...
« SQL Replace How to Export a Table » In order to create a view, use the “Create View” statement using the following convention:[cc lang=”sql”] CREATE VIEW dbo.vStoreAccountNum AS SELECT AccountNumber FROM Sales.Customer WHERE CustomerType = ‘S’ [/cc]...
but you could also create a new “ID” column. To usebookidas a primary key, we need to add it to the materialized view, and then we need to re-create the materialized view. But we can’t just create it again – we’ll get an error in the Django console while trying to run it...
— CREATE SEQUENCE 0 — CREATE MATERIALIZED VIEW 0 — CREATE SYNONYM 0 — CREATE TABLESPACE 0 — CREATE USER 0 — — DROP TABLESPACE 0 — DROP DATABASE 0 — — REDACTION POLICY 0 — — ERRORS 0 — WARNINGS 0 [/sql] You can then choose to save this to a file or not. ...
Oracle Database - Standard Edition - Version 9.2.0.1 and later: How to Create and Refresh a Primary Key Materialized View
CREATE TABLE:TheSQL commandis used to create a new table. table_name:The name of the table that you want to create. Replace this with the name of the table you want. column1, column2, …:You can define the table by specifying the names of the columns. ...
sure, you can also save the SQL query in SQL Server. This is then called a view. In Power BI you can just select that view and it behaves like a table. In SQL Server this view is a SELECT to the real table. To create the view you have to create it in SQL Server....
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