Oracle ORA-01722 错误解决
对于ldquo;ORA-01722:无效数字错误rdquo; 以前总遇到,今天又遇到了!
对于“ORA-01722:无效数字错误” 以前总遇到,今天又遇到了!
产生的情况:
查出的字段中,,需要转化为number型的时候,比较常见。
例如 ,创建物化视图时,如果有某一个列需要转成number的时候,就很常见,
create materialized view mv_test as
select name,
to_number(zd1) zd1, -- @1
cast(zd2 as number) zd2 --@2
from abc
where to_number(zd3)=10 ; --@3
@1 为 select 中的 to_number 时出现,
@ 2为 select 中的cast 函数时出现,
@3 为where条件中,使用to_number时出现。
注意:@1 与@2中是创建物化视图或者select 创建表或者 只是查询时并全部展开时会出现。
解决方法:
1)nvl空转化为数字 , 如,to_number(nvl(z1,0)) ,cast(nvl(zd2) as number)
2) 在1方法无法解决的时候,就是存在无法转化为number的值存在,就是说该字段中存在其他类型的数据,比如字符,
这个时候,转化为varchar或varchar2或保持原数据类型, 如,cast(zd1 as varchar2(32))
相关阅读:
ORA-01172、ORA-01151错误处理
ORA-00600 [2662]错误解决
ORA-01078 和 LRM-00109 报错解决方法
ORA-00471 处理方法笔记
ORA-00314,redolog 损坏,或丢失处理方法
ORA-00257 归档日志过大导致无法存储的解决办法

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Full table scanning may be faster in MySQL than using indexes. Specific cases include: 1) the data volume is small; 2) when the query returns a large amount of data; 3) when the index column is not highly selective; 4) when the complex query. By analyzing query plans, optimizing indexes, avoiding over-index and regularly maintaining tables, you can make the best choices in practical applications.

InnoDB's full-text search capabilities are very powerful, which can significantly improve database query efficiency and ability to process large amounts of text data. 1) InnoDB implements full-text search through inverted indexing, supporting basic and advanced search queries. 2) Use MATCH and AGAINST keywords to search, support Boolean mode and phrase search. 3) Optimization methods include using word segmentation technology, periodic rebuilding of indexes and adjusting cache size to improve performance and accuracy.

Yes, MySQL can be installed on Windows 7, and although Microsoft has stopped supporting Windows 7, MySQL is still compatible with it. However, the following points should be noted during the installation process: Download the MySQL installer for Windows. Select the appropriate version of MySQL (community or enterprise). Select the appropriate installation directory and character set during the installation process. Set the root user password and keep it properly. Connect to the database for testing. Note the compatibility and security issues on Windows 7, and it is recommended to upgrade to a supported operating system.

The difference between clustered index and non-clustered index is: 1. Clustered index stores data rows in the index structure, which is suitable for querying by primary key and range. 2. The non-clustered index stores index key values and pointers to data rows, and is suitable for non-primary key column queries.

MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.

MySQL supports four index types: B-Tree, Hash, Full-text, and Spatial. 1.B-Tree index is suitable for equal value search, range query and sorting. 2. Hash index is suitable for equal value searches, but does not support range query and sorting. 3. Full-text index is used for full-text search and is suitable for processing large amounts of text data. 4. Spatial index is used for geospatial data query and is suitable for GIS applications.

In MySQL database, the relationship between the user and the database is defined by permissions and tables. The user has a username and password to access the database. Permissions are granted through the GRANT command, while the table is created by the CREATE TABLE command. To establish a relationship between a user and a database, you need to create a database, create a user, and then grant permissions.

MySQL and MariaDB can coexist, but need to be configured with caution. The key is to allocate different port numbers and data directories to each database, and adjust parameters such as memory allocation and cache size. Connection pooling, application configuration, and version differences also need to be considered and need to be carefully tested and planned to avoid pitfalls. Running two databases simultaneously can cause performance problems in situations where resources are limited.
