Oracle string concatenation

|| string concatenation is performed using, for example:

　　

Between strings, date type, numeric type can be spliced,

Splicing type digital type and date will be treated as string processing

Example:

　　

　　

Besides you can concat () function to connect string

Example:

　　

　　If a plurality of character strings to be spliced, multiple concat () function nest

　　Note: Unlike the MySql CONCAT () function, Oracle supports only two parameters

　　

　　(Reference address: https: //www.cnblogs.com/wangfuyou/p/5948859.html)