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10 changes: 5 additions & 5 deletions workshops/07-SQL/solutions/planten/exercise-3.md
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Expand Up @@ -189,12 +189,12 @@
14. Hoeveel verschillen de gehanteerde bestelprijzen met de huidige offerteprijzen bij dezelfde leverancier. Toon telkens bestelnummer, artikelcode en het positieve of negatieve verschil.
> 92 records
```sql
SELECT b.bestelnr, o.artcodeLev, (prijs - offerteprijs) AS verschil
FROM offertes 0
JOIN leveranciers l ON b.levcode = o.levcode
JOIN bestellingen b ON l.levcode = b.levcode
SELECT b.bestelnr, bl.artcodeLev, (bl.prijs - o.offerteprijs) AS verschil
FROM offertes o
JOIN leveranciers l ON o.levcode = l.levcode
JOIN bestellingen b ON l.levcode = b.levcode
JOIN bestellijnen bl ON bl.bestelnr = b.bestelnr
WHERE bl.artcodeLev = o.artcodeLev;
WHERE bl.artcodeLev = o.artcodeLev;
```
15. Toon een lijst met bestelnummers, leverancierscode en besteldatum en zorg ervoor dat de de lijst ook de leveranciers bevat waarvoor nog geen bestelling geplaatst werd.
> 17 records
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