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Get Started Free →Query construction, N+1 detection and migration safety for Django: select_related vs prefetch_related, when a migration needs a separate data step, and how to read the SQL a queryset actually emits.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-07 | ✓→✗ | ▼ Worse | 10% | 0% |
| case-06 | ✓→✓ | ＝ Same ✓ | -5% | 0% |
| case-01 | ✓→✓ | ＝ Same ✓ | -17% | 0% |
| case-02 | ✓→✓ | ＝ Same ✓ | 46% | 0% |
| case-03 | ✓→✓ | ＝ Same ✓ | 10% | 0% |
Query construction, N+1 detection and migration safety for Django: select_related vs prefetch_related, when a migration needs a separate data step, and how to read the SQL a queryset actually emits.
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