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Reporting in SQL

Tyler Pernes

Learning & Development Consultant

Typy metrik

  • Metriky objemu
  • Metriky efektivity
Reporting in SQL

Metriky objemu

  • Rostou s velikostí
Reporting in SQL

Metriky objemu

  • Rostou s velikostí

Reporting in SQL

Metriky objemu

  • Rostou s velikostí

Reporting in SQL

Výpočet procenta z celku

basketball_points table
+----------+------------+---------+
| team_id  | player_id  | points  |
|----------|------------|---------|
| 1        | 482        | 92      |
| 1        | 165        | 47      |
| 2        | 222        | 64      |
+----------+------------+---------+
SELECT team_id, SUM(points) AS points
FROM basketball_points
GROUP BY team_id;
Reporting in SQL

Výpočet procenta z celku

basketball_points table
+----------+------------+---------+
| team_id  | player_id  | points  |
|----------|------------|---------|
| 1        | 482        | 92      |
| 1        | 165        | 47      |
| 2        | 222        | 64      |
+----------+------------+---------+
+----------+---------+
| team_id  | points  |
|----------|---------|
| 1        | 782     |
| 2        | 625     |
| 3        | 487     |
| 4        | 398     |
+----------+---------+
Reporting in SQL

Výpočet procenta z celku

Krok 1: Výpočet celkového součtu

SELECT 
    team_id, 
    SUM(points) AS points
    SUM(points) OVER () AS total_points
FROM basketball_points
GROUP BY team_id;

Krok 2: Výpočet procenta z celku

SELECT 
    team_id, 
    SUM(points) AS points
    SUM(points) / SUM(points) OVER () AS perc_of_total
FROM basketball_points
GROUP BY team_id;
Reporting in SQL

Výpočet procenta z celku

Výsledky:

+----------+---------+---------------+
| team_id  | points  | perc_of_total |
|----------|---------|---------------|
| 1        | 782     | .34           |
| 2        | 625     | .27           |
| 3        | 487     | .21           |
| 4        | 398     | .17           |
+----------+---------+---------------+
Reporting in SQL

Výpočet procenta z celku

Procento bodů každého hráče v rámci týmu:

SELECT 
    player_id,
    team_id,
    SUM(points) AS points
    SUM(points) / (SUM(points) OVER (PARTITION BY team_id)) AS perc_of_team
FROM basketball_points
GROUP BY player_id, team_id;
Reporting in SQL

Výpočet procenta z celku

Výsledky:

+-----------+---------+---------+--------------+
| player_id | team_id | points  | perc_of_team |
|-----------|---------|---------|--------------|
| 482       | 1       | 92      | .12          |
| 165       | 1       | 47      | .06          |
| 222       | 2       | 64      | .10          |
+-----------+---------+---------+--------------+
Reporting in SQL

Metriky efektivity

  • Neroste s velikostí
  • Obvykle poměr
Reporting in SQL

Metriky efektivity

  • Neroste s velikostí
  • Obvykle poměr

Reporting in SQL

Metriky efektivity

  • Neroste s velikostí
  • Obvykle poměr

Reporting in SQL

Index výkonu

  • Porovnává výkon s referenční hodnotou
  • Referenční hodnota je obvykle průměr nebo medián
Reporting in SQL

Index výkonu

basketball_summary table
+----------+--------+---------+
| team_id  | games  | points  |
|----------|--------|---------|
| 1        | 24     | 782     |
| 2        | 20     | 625     |
| 3        | 12     | 487     |
+----------+--------+---------+
  • Výkon bodů na zápas?
Reporting in SQL

Index výkonu

Krok 1: body na zápas pro každý tým

SELECT 
    team_id, 
    points/games AS team_ppg
FROM basketball_summary;

Krok 2: body na zápas pro celou ligu

SELECT 
    team_id, 
    points/games AS team_ppg,
    SUM(points) OVER () / SUM(games) OVER () AS league_ppg
FROM basketball_summary;
Reporting in SQL

Index výkonu

Krok 3: index výkonu

SELECT 
    team_id, 
    points/games AS team_ppg,
    SUM(points) OVER () / SUM(games) OVER () AS league_ppg,
    (points/games) 
    / 
    (SUM(points) OVER () / SUM(games) OVER ()) AS perf_index
FROM basketball_summary;
Reporting in SQL

Index výkonu

Krok 3: index výkonu

+----------+----------+------------+-------------+
| team_id  | team_ppg | league_ppg | perf_index  |    
|----------|----------|------------|-------------|
| 1        | 32.6     | 33.8       | 0.96        |
| 2        | 31.3     | 33.8       | 0.92        |
| 3        | 40.6     | 33.8       | 1.20        |
+----------+----------+------------+-------------+
1 Výsledky jasně ukazují, že tým tři skóruje o 20 % více bodů než průměr ligy.
Reporting in SQL

Čas na dotazy!

Reporting in SQL

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