how to use a customised sort order in sql

Question

I want to sort a column not by asc or desc, but I want it to sort according to the sequence that I set. for example I have this data:

Varchar1 |  Varchar2 | Value | Something
1401_1   | 1401_1_9  | 1     | Something1
1401_1   | 1401_1_9  | 0     | Something2
1401_1   | 1401_1_11 | 1     | Something1
1401_1   | 1401_1_11 | 1     | Something2
1401_1   | 1401_1_13 | 0     | Something1
1401_1   | 1401_1_13 | 1     | Something2
1401_1   | 1401_1_15 | 0     | Something1
1401_1   | 1401_1_15 | 1     | Something2
1401_1   | 1401_1_17 | 1     | Something1
1401_1   | 1401_1_17 | 0     | Something2
1401_1   | 1401_1_19 | 1     | Something1
1401_1   | 1401_1_19 | 0     | Something2
1401_1   | 1401_1_21 | 1     | Something1
1401_1   | 1401_1_21 | 1     | Something2
1401_1   | 1401_1_23 | 0     | Something1
1401_1   | 1401_1_23 | 1     | Something2
1401_1   | 1401_1_1  | 0     | Something1
1401_1   | 1401_1_1  | 1     | Something2
1401_1   | 1401_1_3  | 1     | Something1
1401_1   | 1401_1_3  | 0     | Something2
1401_1   | 1401_1_5  | 1     | Something1
1401_1   | 1401_1_5  | 0     | Something2
1401_1   | 1401_1_7  | 1     | Something1
1401_1   | 1401_1_7  | 1     | Something2

here is my code:

SELECT * 
FROM (SELECT TOP 12 
            [varchar2] AS [T2], 
            SUM(CASE WHEN [Type] = 'something1' THEN value END) AS something1, 
            SUM(CASE WHEN [Type] = 'something2' THEN value END) AS [something2] 
    FROM tbl_table 
    GROUP by [varchar2] 
    ORDER by [varchar2] DESC)x 
ORDER BY [T2] ASC

That code produces something like this : 1401_1_1, 1401_1_11, 1401_1_13, 1401_1_15, 1401_1_17, 1401_1_19, 1401_1_21, 1401_1_23, 1401_1_3, 1401_1_5, 1401_1_7, 1401_1_9 ==> it sorting in varchar

I want it to sort according to this sequence : 1401_1_9, 1401_1_11, 1401_1_13, 1401_1_15, 1401_1_17, 1401_1_19, 1401_1_21, 1401_1_23, 1401_1_1, 1401_1_3, 1401_1_5, 1401_1_7

Is it possible to do that?

Answer 1

You can use below code:

Order by PARSENAME(REPLACE(@varchar2,'_','.'),3),
         PARSENAME(REPLACE(@varchar2,'_','.'),2),
         CASE WHEN PARSENAME(REPLACE([varchar2],'_','.'),1)>=9 THEN 1 ELSE 2 END,
         PARSENAME(REPLACE(@varchar2,'_','.'),1)