How to reconstruct quarterly sales data in BigQuery?
Posted on 2025-04-13
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Unpivoting in BigQuery
Question:
How do I restructure a table from having rows of data for different quarters to having columns for the quarters? For example, converting a table like this:
| product | Q1 | Q2 | Q3 | Q4 | |---|---|---|---|---| | Kale | 51 | 23 | 45 | 3 | | Apple | 77 | 0 | 25 | 2 |
into a table with columns for sales and quarter:
| product | sales | quarter | |---|---|---| | Kale | 51 | Q1 | | Kale | 23 | Q2 | | Kale | 45 | Q3 | | Kale | 3 | Q4 | | Apple | 77 | Q1 | | Apple | 0 | Q2 | | Apple | 25 | Q3 | | Apple | 2 | Q4 |
Answer:
Update 2021:
BigQuery now includes an UNPIVOT operator that can rotate rows of data into columns.
Before UNPIVOT:
| product | sales | quarter | |---|---|---| | Kale | 51 | Q1 | | Kale | 23 | Q2 | | Kale | 45 | Q3 | | Kale | 3 | Q4 | | Apple | 77 | Q1 | | Apple | 0 | Q2 | | Apple | 25 | Q3 | | Apple | 2 | Q4 |
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