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How to Increment a Counter in a MySQL SELECT Query?

Linda Hamilton
Linda HamiltonOriginal
2024-11-24 10:26:151034browse

How to Increment a Counter in a MySQL SELECT Query?

Incrementing a Counter in a MySQL SELECT Query

To generate a sequence number alongside the results of a SELECT query in MySQL, consider the following approach:

Solution:

Employ the following query to achieve the desired output:

select name,
      @rownum := @rownum + 1 as row_number
from your_table
cross join (select @rownum := 0) r
order by name;

Breaking down the query:

  • cross join (select @rownum := 0) r: Introduces a variable @rownum initialized to 0, allowing for the creation of a row counter without a separate query.

Alternative Syntax:

If the query is used within a stored procedure, it can be expressed in two separate queries:

set @rownum := 0;

select name,
      @rownum := @rownum + 1 as row_number
from your_table
order by name;

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