in10: How to build a metric in a metric
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This document discusses how to build metrics that aggregate data on multiple levels, known as metrics in metrics. It provides examples of calculating the average monthly revenue and average quarterly number of new leads. The solution is to define the aggregation level for the inner metric using the BY clause, such as BY Month/Year. This tells the inner aggregation where to stop and hand over to the outer aggregation. Behind the scenes, the inner metric computes individual results but returns a single value to the outer metric and report. The BY clause is not needed if the attribute is already in the report. Metrics can be nested with multiple BY clauses to aggregate data on multiple attributes.
in10: How to build a metric in a metric
- 1. in How to build 10 a metric in a metric Using BY in MAQL with Petr Olmer, GoodData Evangelist
- 2. What is a metric in a metric? example 1: average monthly revenue There are aggregations average from monthly numbers outer level on two levels. total revenue inner level (by month) for each month example 2: average number of new leads in a quarter average from quarterly numbers In most cases, the aggregations are different. number of new leads for each quarter Exception: average of averages. GoodData in10 with Petr Olmer: How to build a metric in a metric 2
- 3. Solution average monthly revenue average from monthly numbers Average Monthly Revenue: SELECT AVG(Monthly Revenue) total revenue for each month Monthly Revenue: SELECT SUM(Revenue) BY Close Month/Year average number of new leads in a quarter average from quarterly numbers Average Quarterly Leads: SELECT AVG(Quarterly Leads) number of new leads for each quarter Quarterly Leads: SELECT COUNT(Lead) BY Created Quarter/Year GoodData in10 with Petr Olmer: How to build a metric in a metric 3
- 4. Solution in detail Average Monthly Revenue: SELECT AVG(Monthly Revenue) Outer metric is an aggregation of the inner metric. Monthly Revenue: SELECT SUM(Revenue) BY Close Month/Year Inner metric uses BY to define the aggregation level. GoodData in10 with Petr Olmer: How to build a metric in a metric 4
- 5. Why BY? You need to define the border between the inner aggregation and the outer one. inner SUM outer AVG BY Month Without BY, the inner SUM would not know where to stop and hand over to the outer AVG. GoodData in10 with Petr Olmer: How to build a metric in a metric 5
- 6. Behind the scenes inner SUM outer AVG BY Month Nov 2010 $450K Dec 2010 $580K Jan 2011 $320K $400K Feb 2011 $360K March 2011 $430K April 2011 $260K your datamart behind the scenes report GoodData in10 with Petr Olmer: How to build a metric in a metric 6
- 7. Behind the scenes You’ve asked for one number and that’s what you get: Average monthly revenue The monthly report is computed but you cannot see it. Nov 2010 $450K Dec 2010 $580K Jan 2011 $320K $400K Feb 2011 $360K March 2011 $430K April 2011 $260K your datamart report behind the scenes report GoodData in10 with Petr Olmer: How to build a metric in a metric 7
- 8. Automatic (in-report) BY You don’t need to use BY when the attribute is in the report. Month/Year Revenue Monthly Revenue Revenue: Nov 2010 $450K $450K SELECT SUM(Revenue) Dec 2010 $580K $580K Jan 2011 $320K $320K Monthly Revenue: Feb 2011 $360K $360K SELECT SUM(Revenue) BY Month/Year March 2011 $430K $430K April 2011 $260K $260K automatic BY Both metrics return the same numbers because Month/Year attribute is in the report. BY says: Include this attribute in the computation. But it’s already there! GoodData in10 with Petr Olmer: How to build a metric in a metric 8
- 9. BY and BY You can include more than one attribute in the BY clause. SELECT SUM(Revenue) BY Month/Year, Department It will return a number for each month and department. You can have a metric in a metric in a metric in a... Best Region Leads: one number only SELECT MAX(Average Monthly/Region Leads) Average Monthly/Region Leads: one number for each region SELECT AVG(Month/Region Leads) BY Region Month/Region Leads: one number for each month and region SELECT COUNT(Lead) BY Month/Year, Region GoodData in10 with Petr Olmer: How to build a metric in a metric 9
- 10. Off you go... Find the border. average from region numbers total revenue for each region Put BY into the inner metric. SELECT SUM(Revenue) BY Region GoodData in10 with Petr Olmer: How to build a metric in a metric 10