Oracle数据库报bug,表或试图不存在,表名中包含空格
一 1.开始:通过powderDesiger导出的SQL代码中的字段都是小写的,然后直接导入了oracle. 2.bug:无法修改表结构(在PL/SQL Developer中)---包括增加删除修改... 3. 明明该表是存在的,删除时报:表或视图不存在~!第 1 行出现错误:ORA-00942: 表或视图不存在后来终
一1.开始:通过powderDesiger导出的SQL代码中的字段都是小写的,然后直接导入了oracle.
2.bug:无法修改表结构(在PL/SQL Developer中)---包括增加删除修改...
3.
明明该表是存在的,删除时报:表或视图不存在~! 第 1 行出现错误: ORA-00942: 表或视图不存在 后来终于找出原因是因为我的表名是小写的,而是大写的则不会出现这个问题。 正常情况下....数据字典里面的数据都是大写,,,,动态视图都是小写的........在用关键字做表或其它对象的名时用"" 所以表名用""引起来就行了 如何删除表时用了CASCADE CONSTRAINTS则会把与它相关的约束一起删除
而需要删除的表格可以用一个select查询出来,代码如下
--查询外键约束 select 'Alter table '||TABLE_NAME||' '||'drop constraint'||' '|| CONSTRAINT_NAME||';' from user_constraints where CONSTRAINT_TYPE ='R' and TABLE_NAME like 'TA/_%' escape '/'; --查询表名 select 'drop table '||TABLE_NAME||' '||';' from user_tables where TABLE_NAME like 'TA/_%' escape '/';
二.
1.生成表的时候,表名没有检查,直接建表,结果,表既有主键,又有外键,删除啊删除不了,双引号引起来没有效果
2.报bug,无效字符,或者表或视图不存在的bug
3.解决,改表名,然后删除
代码:ALTER TABLE "TBL_CERT IFICATE _TYPE" rename to "TABLE2";
此处,双引号引起表名,此处的双引号的作用,与之前双引号的作用不一样,之前双引号引的是小写的表名,,此处引起的是不连续的表名

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

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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