SQL and elevator: 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 — is a kind of — Computing device. A data-processing machine.
4. Step 4. Computing device — includes — Tide-predicting machine. An analogue calculator.
5. Step 5. Tide-predicting machine — has part — Pulley. Pulleys add up the harmonics.
6. Step 6. Pulley — is part of — Elevator. The rope runs over a pulley.

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