Range

Here you are shown how to break your query down by range.

schema:scott

DROP TABLE population;

CREATE TABLE population (
   id INT,
   age INT,
   spend INT );
INSERT INTO population VALUES (1,34,100);
INSERT INTO population VALUES (2,31,110);
INSERT INTO population VALUES (3,24,140);
INSERT INTO population VALUES (4,35,130);
INSERT INTO population VALUES (5,39,120);

In this example if you want to see how much different age groups spend

then you will have to group the individuals in specific ranges.

First you use ROUND to group together the different age groups.

You then use the AVG function to find the average they spend.

Finally you use a CONCAT function to make the age ranges more clear.

SELECT (low-5) || '-' || (low+4) AS the_range,
        avgSpend
  FROM (SELECT ROUND(age,-1) AS low,
               AVG(spend)    AS avgSpend
          FROM population
          GROUP BY ROUND(age,-1)) t

SELECT CONCAT(low-5,'-' ,low+4) AS the_range,
        avgSpend
  FROM (SELECT ROUND(age,-1) AS low,
               AVG(spend)    AS avgSpend
          FROM population
          GROUP BY ROUND(age,-1)) t

SELECT STR(low-5) + '-' + STR(low+4) AS the_range,
        avgSpend
  FROM (SELECT ROUND(age,-1) AS low,
               AVG(spend)    AS avgSpend
          FROM population
          GROUP BY ROUND(age,-1)) t

You can also use the FLOOR function:

SELECT age, 5*FLOOR(age/5) AS valueBucket,
       CONCAT(5*FLOOR(age/5),'-',5*FLOOR(age/5)+4) AS the_range
  FROM population 

SQL HACKS

Hack 10 Converting subqueries into joins

Hack 11 Converting aggregate subqueries into joins

Hack 14 Generate Combinations

Hack 16 Search for a String across columns

Hack 24 Multiply Across a Result Set

Hack 25 Keep a running total

Hack 25.5 Splitting and combining columns

Hack 26 Include the rows your JOIN forgot

Hack 30 Calculate the maximum/minimum of two fields

Hack 33 Get values and subtotals in one shot

Hack 50 Combine tables containing different data

Hack 51/52 Display rows as columns

Hack 55 Import Someone Else's Data

Hack 62 Issue Queries Without Using a Table

Hack 63 Generate rows without tables

Hack 70 Combine your queries

Hack 72 Extract a subset of the results

Hack 78 Break it down by Range

Hack 88 Test two values from a subquery

Hack 98 Find and stop long running queries

Hack 100 Run SQL from a Web Page