How to Inner Join Two SQL Server Tables Based on Row Number?

Inner Join on Row Number in SQL Server

Objective: Perform an inner join on two tables using their row numbers.

Scenario:

Consider two tables, A and B, with the following data:

Table A	Table B
RowA	Row4
RowB	Row3
RowC	Row2
RowD	Row1

The goal is to join the tables based on their row numbers and retrieve the following output:

Table A	Table B
RowA	Row1
RowB	Row2
RowC	Row3
RowD	Row4

Solution:

To perform an inner join on row numbers, utilize the ROW_NUMBER() function as follows:

SELECT A.val, B.val
FROM (
    SELECT val, ROW_NUMBER() OVER (ORDER BY val) AS row_num
    FROM A
) AS A
JOIN (
    SELECT val, ROW_NUMBER() OVER (ORDER BY val) AS row_num
    FROM B
) AS B
ON A.row_num = B.row_num
ORDER BY A.val, B.val;

This query creates a temporary table for each input table (A and B) and assigns row numbers to each row based on the val column. The tables are then joined using the row_num column, and the results are sorted by the val column in both tables.

Additional Considerations:

• If no specific ordering is desired, remove the ORDER BY clause from the ROW_NUMBER() function to preserve the original row order.

SQL Fiddle Demo:

[SQL Fiddle Demo](https://www.sqlfiddle.com/#!18/69540/2)

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