SQL and centrifugal pump: 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 made of — Cast iron. The casing is cast iron.
4. Step 4. Cast iron — is material for — Centrifugal pump. The casing is cast iron.

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