Join n result stets horizontal - mysql

Question

I know that there are many questions on this topic, but no one seem to works for my problem
Shortly, I want to merge horizontal an unknown number of result sets as in the following example
Result 1:
Name |sum1 |sum2
________________
name1| 0.5 |0.1
name2| 0.6 |0.2
Result 2:
Name |sum1 |sum2
________________
name1| 1.5 |0.7
name2| 1.6 |0.9
.
.
.
Result n:
Name |sum1 |sum2
________________
name1| 7.5 |9.7
name2| 8.6 |5.9
Finally :
Name |sum1 |sum2| sum1 | sum2|.......| sum1|sum2
________________________________________
name1| 0.5 |0.1 | 1.5 | 0.7 |.......| 7.5 |9.7
name2| 0.6 |0.2 | 1.6 | 0.9 |.......| 8.6 |5.9
The column "Name" is exactly the same in all of the result.
Think you guys could help out?

Answer 1

You would use join:
select r1.name, r1.sum1, r1.sum2, r2.sum1, r2.sum2, r3.sum1, r3.sum2
from result1 r1 join
result2 r2
on r1.name = r2.name join
results r3
on r1.name = r3.name
You would need to continue this for each result set.
Now, having an unknown number of result sets makes this more complicated. That simply requires generating a dynamic SQL statement, based on the same logic.

Answer 2

Quick stored procedure to dynamically build your query string and execute it. You can control the execute with the first input #in_run_query.
CREATE PROCEDURE dynamic_sql_query
#in_run_query INT
, #in_count_results_sets INT
AS
BEGIN
IF #in_count_results_sets IS NULL
EXIT
IF TRY_CONVERT(INT,#in_count_results_sets) IS NULL
EXIT
IF #in_count_results_sets < 2
BEGIN
SELECT 'Counter must be between 2 and 100'
EXIT
END
IF #in_count_results_sets > 100
BEGIN
SELECT 'Build a better database'
EXIT
END
DECLARE #sql_string NVARCHAR(MAX) , #counter INT = 2
SET #select = 'SELECT r1.name, r1.sum1, r1.sum2'
SET #from = 'FROM result1 AS r1'
LOOP:
SET #prefix = 'r' + CAST(#counter AS String)
SET #full_name = 'result' + CAST(#counter AS String)
-- select
SET #select = #select + ', ' + #prefix + '.name, ' + #prefix + '.sum1, ' + #prefix + '.sum2'
-- from
SET #from = #from + ' join ' + #full_name + ' AS ' + #prefix + ' on r1.name = ' + #prefix + '.name'
IF #counter = #in_count_results_sets
GOTO AppendStrings
#counter = #counter + 1
GOTO LOOP
AppendStrings:
SET #sql_string = #select + ' ' + #from + ';'
IF #in_run_query <> 1
BEGIN
SELECT #sql_string
EXIT
END
EXECUTE sp_executesql #sql_string
END