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SQL ROW_NUMBER() Function Translation

This description details how to retain the functionality of the `ROW_NUMBER()` function in SQL while partitioning by concatenated fields from the `hri` table and ordering by `ins_date` from the `h` table, ensuring equivalent logic in the

Prompt

row_number() over (
      partition by (cast(case
        when hri."TITLE" is not null then hri."TITLE"
        else ''
      end as varchar) || cast(case
        when hri."DOC_CAPTION" is not null then hri."DOC_CAPTION"
        else ''
      end as varchar) || cast(case
        when hri."DOC_SERIES" is not null then hri."DOC_SERIES"
        else ''
      end as varchar) || cast(case
        when hri."DOC_NUMBER" is not null then hri."DOC_NUMBER"
        else ''
      end as varchar))
      order by h.ins_date desc
    ) as row_num

Answer

Code Translation

Original Code Analysis

The provided snippet applies ROW_NUMBER() to assign a unique number to rows within a partition defined by a combination of fields (TITLE, DOC_CAPTION, DOC_SERIES, and DOC_NUMBER) from the hri table. It also orders the partition by the ins_date field from the h table in descending order.

SQL Translation

To maintain the original logic and behavior in SQL, the ROW_NUMBER() function along with the partition can be expressed as follows:

SELECT 
    ROW_NUMBER() OVER (
        PARTITION BY 
            CAST(CASE 
                WHEN hri.TITLE IS NOT NULL THEN hri.TITLE 
                ELSE '' 
            END AS VARCHAR) || 
            CAST(CASE 
                WHEN hri.DOC_CAPTION IS NOT NULL THEN hri.DOC_CAPTION 
                ELSE '' 
            END AS VARCHAR) || 
            CAST(CASE 
                WHEN hri.DOC_SERIES IS NOT NULL THEN hri.DOC_SERIES 
                ELSE '' 
            END AS VARCHAR) || 
            CAST(CASE 
                WHEN hri.DOC_NUMBER IS NOT NULL THEN hri.DOC_NUMBER 
                ELSE '' 
            END AS VARCHAR)
        ORDER BY h.ins_date DESC
    ) AS row_num
FROM 
    hri
JOIN 
    h ON /* specify your join condition here */

Key Points

The ROW_NUMBER() function is preserved.
The partitioning logic is maintained using concatenated fields.
Ordering is specified as per original logic by ins_date DESC.
Ensure you complete the SQL with the correct join condition between the hri and h tables.

This SQL code will function equivalently to the provided code snippet, providing the same row numbering logic based on the specified partition and order criteria.

Description

This description details how to retain the functionality of the ROW_NUMBER() function in SQL while partitioning by concatenated fields from the hri table and ordering by ins_date from the h table, ensuring equivalent logic in the translated snippet.