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Agg functions

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Mark Needham 2024-03-22 11:54:04 +00:00
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docs/en/sql-reference/window-functions/index.md
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@ -101,9 +101,9 @@ Engine = Memory;
INSERT INTO salaries FORMAT Values
('Port Elizabeth Barbarians', 'Gary Chen', 195000, 'F'),
('Port Elizabeth Barbarians', 'Charles Juarez', 190000, 'F'),
('New Coreystad Archdukes', 'Charles Juarez', 190000, 'F'),
('Port Elizabeth Barbarians', 'Michael Stanley', 150000, 'D'),
('Port Elizabeth Barbarians', 'Scott Harrison', 150000, 'D'),
('New Coreystad Archdukes', 'Scott Harrison', 150000, 'D'),
('Port Elizabeth Barbarians', 'Robert George', 195000, 'M');
```
@ -141,6 +141,46 @@ FROM salaries;
└─────────────────┴────────┴─────┴──────┴───────────┘
```
### Aggregation functions
Compare each player's salary to the average for their team.
```sql
SELECT player, salary, team,
avg(salary) OVER (PARTITION BY team) AS teamAvg,
salary - teamAvg AS diff
FROM salaries;
```
```text
┌─player──────────┬─salary─┬─team──────────────────────┬─teamAvg─┬───diff─┐
│ Charles Juarez │ 190000 │ New Coreystad Archdukes │ 170000 │ 20000 │
│ Scott Harrison │ 150000 │ New Coreystad Archdukes │ 170000 │ -20000 │
│ Gary Chen │ 195000 │ Port Elizabeth Barbarians │ 180000 │ 15000 │
│ Michael Stanley │ 150000 │ Port Elizabeth Barbarians │ 180000 │ -30000 │
│ Robert George │ 195000 │ Port Elizabeth Barbarians │ 180000 │ 15000 │
└─────────────────┴────────┴───────────────────────────┴─────────┴────────┘
```
Compare each player's salary to the maximum for their team.
```sql
SELECT player, salary, team,
max(salary) OVER (PARTITION BY team) AS teamAvg,
salary - teamAvg AS diff
FROM salaries;
```
```text
┌─player──────────┬─salary─┬─team──────────────────────┬─teamAvg─┬───diff─┐
│ Charles Juarez │ 190000 │ New Coreystad Archdukes │ 190000 │ 0 │
│ Scott Harrison │ 150000 │ New Coreystad Archdukes │ 190000 │ -40000 │
│ Gary Chen │ 195000 │ Port Elizabeth Barbarians │ 195000 │ 0 │
│ Michael Stanley │ 150000 │ Port Elizabeth Barbarians │ 195000 │ -45000 │
│ Robert George │ 195000 │ Port Elizabeth Barbarians │ 195000 │ 0 │
└─────────────────┴────────┴───────────────────────────┴─────────┴────────┘
```
### Partitioning by column
```sql
@ -446,7 +486,7 @@ ORDER BY
The following examples solve common real-world problems.
### Maximum/total salary per department.
### Maximum/total salary per department
```sql
CREATE TABLE employees
@ -502,7 +542,7 @@ FROM
└────────────┴──────┴────────┴────────────────────┴──────────────────────┴──────────────────┘
```
### Cumulative sum.
### Cumulative sum
```sql
CREATE TABLE warehouse