Use the SQL command DROP VIEW to drop a view. For example: DROP VIEW Accounts_staff;Modifying a Join View Oracle allows you, with some restrictions, to modify views that involve joins. Consider the following simple view: CREATE VIEW Emp_view AS SELECT Ename, Empno, deptno FROM Emp;...
The insert statement adds a new row or rows in a table in theOracle database. We generally use it after we have created a table in the database. One important point to remember is that while inserting records into a table, we must provide a value for every NOT NULL value. Let us lo...
调试经验——如何查看Oracle自定义函数 (How to view definition of user defined functions in Oracle),程序员大本营,技术文章内容聚合第一站。
Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and
15,函数的创建,要求必须有返回值,必须在语句中调用,需要多个返回值时,使用out参数类型,在user_procedures表中查询属性,在user_source表中查询源代码,创建示例:CREATE OR REPLACE FUNCTION my_function_01--创建函数(v_01 IN
Access to the path 'C:\' is denied. access to the port com1 is denied c# Access to the registry key 'HKEY_CLASSES_ROOT\name of the class' is denied. access variable from another function Access Variables in Different Projects in a Solution Accessibility of parent's class fields from ch...
I’ve always appreciated the CREATE OR REPLACE functionality in Oracle for views, packages and triggers, and I’ve often wanted a similar CREATE OR REPLACE TABLE. Many times, I’ll find myself needing to quickly drop and re-create a table while I’m designing it. ...
I have written many posts related totriggersin Oracle Forms, I have given examples forForm Level triggers,Data Block Level triggersandItem Level Triggers. And in this tutorial I am just giving the simple tutorial to how to create a trigger in Oracle Form's object navigator. ...
Oracle - FUNCTION getFunction ( dbId IN NUMBER) RETURN NUMBER IS <Function Body> MySQL - CREATE FUNCTION getFunction ( dbId IN INT) RETURNS INT RETURN <Function Body> 10) Replace functions as follows Oracle => MySQL --- NVL() => IFNULL() Find RegEx - NVL\((...
Oracle 9i or later versions supports EXTRACT() function. It is used to extract TIMESTAMP, DATE. Interval value or XML components from the given input. In ambiguity case for the combinations of date-time field and interval value expression, Oracle returns UNKNOWN as a result. ...