Remove 02 snowflake-identify-null-columns-in-table
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Modeling ragged time-varying hierarchies

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erp_components : assembly_id component_id installed_at removed_at Bike-1 2023-01-01 Bike-1 Frame-1 2023-01-01 Bike-1 Wheel-1 2023-01-01 Wheel-1 Rim-1 2023-01-01 Wheel-1 Tire-1 2023-01-01 Tire-1 Tube-1 2023-01-01 Now let's suppose this bike has been ridden for a while, and on June 1, the user of the bike reported a flat tire.