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Task: PostgreSQL unnest() with Element Number

Task: PostgreSQL unnest() with Element Number: a task in Terminal-Lego-15k (Harbor dataset). Write a PostgreSQL SQL query that unnests comma-separated values from a column while preserving the original position (ordinal number) of each element within its source string.

The task

Write a PostgreSQL SQL query that unnests comma-separated values from a column while preserving the original position (ordinal number) of each element within its source string.

Part of PrimeIntellect/Terminal-Lego-15k.