Oracle Chinese sorting Oracle Chinese field sorting

Oracle Chinese sorting Oracle Chinese field sort

One 、 Scenario description

        1、 In actual development , Encountering field sorting , About the following ：

 

        2、 The demand of positive order is ： A class 、 Two category 、 Three types of ; The reverse order requirement is ： Three types of 、 Two category 、 A class .

        3、 As you can see from the diagram , Use the default sort , Can't achieve the expected effect , that Oracle in , How to deal with Chinese sorting ？

Two 、 Problem solving

        1、 Use nlssort function , Solve the problem of Chinese sorting .

        2、Oracle9i Before , Chinese is sorted according to the binary code . stay oracle9i According to Pinyin added in 、 Radicals 、 Stroke sorting function . Set up NLS_SORT value ：

• SCHINESE_RADICAL_M ： According to the radical （ The first order ）、 stroke （ The second order ） Sort
• SCHINESE_STROKE_M ： According to the stroke （ The first order ）、 Radicals （ The second order ） Sort
• SCHINESE_PINYIN_M ： Sort by Pinyin , The default sorting method of the system is Pinyin sort

        3、 Examples are as follows ：

 
// Sort by stroke 
 select * from dept order by nlssort(name,'NLS_SORT=SCHINESE_STROKE_M');

 // Sort by radical 
 select * from dept order by nlssort(name,'NLS_SORT=SCHINESE_RADICAL_M');

 // Sort by Pinyin , This is the default sorting method of the system 
 select * from dept order by nlssort(name,'NLS_SORT=SCHINESE_PINYIN_M');

        4、 Screenshot of the case ：