How to Assign Sequential Numbers to Rows in MySQL Using a Single SQL Command?

Updating Columns with a Sequence Number in MySQL

The task at hand requires updating a set of records with sequential numbers, converting a dataset like this:

Into something like this:

To achieve this in a single SQL command for MySQL, follow these steps:

Solution:

SET @rank := 0;
UPDATE T
SET Number = @rank := @rank + 1;

Alternative Solution:

UPDATE T
JOIN (SELECT @rank := 0) r
SET Number = @rank := @rank + 1;

In both solutions, the sequential numbers are generated and assigned to the Number column using the @rank variable. This technique helps you assign unique and ordered values to the records in a single SQL operation, making it a simple and efficient way to manage sequential numbering in MySQL.

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