SQL Trainer

Syksy 2025

Deadline: 2025-08-11 12:34:56
Rules
Osa 1
Osa 2
Osa 3
all
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Task 17

Hae eri yritysten määrä.

Example

Input

Employees

idnamesalarycompany
1Uolevi5000Google
2Maija6000Google
3Liisa2000Amazon
4Kaaleppi7500Microsoft

Output
3