这两天学习oracle的触发器,创建触发器的时候时不时会遇到:ldquo;无法对sys拥有的对象创建触发器rdquo;的错误提示。使用的用户
这两天学习Oracle的触发器,创建触发器的时候时不时会遇到:“无法对sys拥有的对象创建触发器”的错误提示。
使用的用户登录是自己创建的新用户XXX下登录,,之后再XXX用户下创建一个名为MECITY的表空间,接着在XXX用户下的MECITY表空间下创建名为CITYS的表。
然后,想给CITY表建立一个触发器,使每次插入数据时表的ID列会自动增加1。
创建触发器语句:
CREATE TRIGGER TRI_CITY_ID
BEFORE INSERT ON CITYS
FOR EACH ROW
BEGIN
SELECT CITY_ID.NEXTVAL INTO :NEW.ID FROM CITYS;
END;
错误提示:ORA-O4O89:无法对sys拥有的对象创建触发器。
首先在tables里面找到该表,右键查看该表的properties,里面有owner。出现上面这种情况一定是owner为sys。
下面提供一种解决方法:
为当前登录用户创建名称为该表名称相同的表,数据从sys的表里面拷贝。如:
CREATE TABLE XXX.CITYS AS SELECT * FROM SYS.CITYS;
然后删除掉sys底下的表。
DROP TABLE SYS.CITYS;
再执行创建触发器语句。

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The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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