SQL and CNC machine: what they have in common

1. Step 1. SQL — uses — Database. Database queries.
2. Step 2. Database — evolved from — Hollerith tabulator. Processing large datasets began with tabulators.
3. Step 3. Hollerith tabulator — uses — Electromagnetism. The counters click with electromagnets.
4. Step 4. Electromagnetism — is used in — Servomotor. A servo is an electric motor with feedback.
5. Step 5. Servomotor — is part of — CNC machine. Servo drives move the axes.

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