Add a row number to result set of a SQL query

Question

I have a simple select statement. I want to add a temporary column which will number the rows in my result set. I tried this -

declare @num int
set @num = 0         


        

Answer 1

So before MySQL 8.0 there is no ROW_NUMBER() function. Accpted answer rewritten to support older versions of MySQL:

SET @row_number = 0;
SELECT t.A, t.B, t.C, (@row_number:=@row_number + 1) AS number
FROM dbo.tableZ AS t ORDER BY t.A;