# Task: 035

**Database:** professional_basketball  

## Question
Count the number of people who played or coached in the NBA finals in the 1990s.


## Gold Query

```sql
WITH players_1990s AS (
SELECT DISTINCT pt.playerID
FROM players_teams pt
JOIN series_post sp ON pt.tmID = sp.tmIDWinner AND pt.year = sp.year
WHERE sp.round = 'F'
AND sp.year BETWEEN 1990 AND 1999
AND pt.lgID = 'NBA'
UNION
SELECT DISTINCT pt.playerID
FROM players_teams pt
JOIN series_post sp ON pt.tmID = sp.tmIDLoser AND pt.year = sp.year
WHERE sp.round = 'F'
AND sp.year BETWEEN 1990 AND 1999
AND pt.lgID = 'NBA'
),
coaches_finals_1990s AS (
SELECT DISTINCT c.coachID
FROM coaches c
JOIN series_post sp ON c.tmID = sp.tmIDWinner AND c.year = sp.year
WHERE sp.round = 'F'
AND sp.year BETWEEN 1990 AND 1999
AND c.lgID = 'NBA'
UNION
SELECT DISTINCT c.coachID
FROM coaches c
JOIN series_post sp ON c.tmID = sp.tmIDLoser AND c.year = sp.year
WHERE sp.round = 'F'
AND sp.year BETWEEN 1990 AND 1999
AND c.lgID = 'NBA'
),
qualified_people(personID) AS (
SELECT DISTINCT playerID
FROM players_1990s
UNION
SELECT DISTINCT coachID
FROM coaches_finals_1990s
)
SELECT COUNT(DISTINCT personID) FROM qualified_people;
```

**Execution Result:**

|   COUNT(DISTINCT personID) |
|----------------------------|
|                        220 |

*1 rows*