TheWITH query_name clause lets you assign a name to a subquery block. You can then reference the subquery block multiple places in the query by specifying the query name. Oracle optimizes the query by treating the query name as either an inline view or as a temporary table. (WITH语句只能...
WITH CHECK OPTION The WITH CHECK OPTION clause protects the view from any changes to the underlying table that would produce rows that are not included in the defining query. Oracle CREATE VIEW examples Let’s look at some examples of creating new views based on the tables in the sample data...
ORA-01402: view WITH CHECK OPTIONwhere-clause violation 6. 创建具有READ ONLY约束的视图 通过为视图添加READ ONLY约束,可以指定该视图是只读的。 如下: store@PDB1> create view cheap_products_view3 asselect * from products where price < 15 with read only constraintcheap_products_view3_read_only; ...
1权限:要在当前方案中创建视图, 用户必须具有create view系统权限; 要在其他方案中创建视图, 用户必须具有create any view系统权限. 视图的功能取决于视图拥有者的权限. 2 语法:create [ or replace ] [ force ] view [schema.]view_name [ (column1,column2,...) ] as select ... [ with check option...
5 with read only:创建的视图只能用于查询数据, 而不能用于更改数据. 3.1创建简单视图 简单视图定义:是指基于单个表建立的,不包含任何函数、表达式和分组数据的视图。 SQL> conn /as sysdba Connected. SQL> grant create view to scott; SQL> conn scott/tiger ...
A table lock, also called a TM lock, is acquired by a transaction when a table is modified by an INSERT, UPDATE, DELETE, MERGE, SELECT with the FOR UPDATE clause, or LOCK TABLE statement. DML operations require table locks to reserve DML access to the table on behalf of a transaction ...
If a view is defined with WITH CHECK OPTION, then a row cannot be inserted into, or updated in, the base table (using the view), if the view cannot select the row from the base table. If a NOT NULL column that does not have a DEFAULT clause is omitted from the view, then a ...
the function operates on and returns an output row for each group defined by the GROUP BY clause. ■ As an analytic function, LISTAGG partitions the query result set into groups based on one or more expression in the query_partition_clause. The arguments to the function are subject to the ...
bug: 16086769,错误特征:ORA-600 [13011] ORA-600 [13013] when executing a DML if the WHERE clause includes an added column with a default valuebug: 18405192,错误特征:Create Table Fails with ORA-07445 [evaopn3()+135] bug: 20048270,错误特征:ORA-00979: not a GROUP BY expression--12102版...
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