How to show Min and Max values when another value "changes to a new value"

Question

Hi
If I have this data (generated with this query: SELECT 1 A, 1 B UNION ALL SELECT 2, 1 UNION ALL SELECT 3, 2 UNION ALL SELECT 4, 2 UNION ALL SELECT 5, 1)
A B
1 1
2 1
3 2
4 2
5 1
How can I generate this data (created with this query SELECT 1 Amin, 2 Amax, 1 B UNION ALL SELECT 3, 4, 2 UNION ALL SELECT 5, 5, 1)
Amin Amax B
1 2 1
3 4 2
5 5 1
Thanks.

Answer 1

Please post DDL, so that people do not have to guess what the keys, constraints, Declarative Referential Integrity, data types, etc. in your schema are. Learn how to follow ISO-11179 data element naming conventions and formatting rules. Temporal data should
use ISO-8601 formats. Code should be in Standard SQL as much as possible and not local dialect. 
This is minimal polite behavior on SQL forums. You also do not know the ANSI/ISO syntax for insertion and you did the old Sybase insertion kludge wrong, that we need keys, etc.
CREATE TABLE Foobar
(foo_seq INTEGER NOT NULL PRIMARY KEY,
 glop_score INTEGER NOT NULL);
INSERT INTO Foobar
VALUE
(1,1),
(2,1),
(3,2),
(4,2),
(5,1);
>> How can I generate this data (created with this query SELECT 1 Amin, 2 Amax, 1 B UNION ALL SELECT 3, 4, 2 UNION ALL SELECT 5, 5, 1) <<
This makes no sense; you have the wrong syntax and mixed data types. My guess is: 
SELECT MIN(foo_seg), MAX(foo_seq), MAX(glop_score)
  FROM Foobar
 GROUP BY glop_score
HAVING MIN(glop_score) = MAX(glop_score); 
Amin Amax B
1 2 1
3 4 2
5 5 1
--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
in Sets / Trees and Hierarchies in SQL