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Finance says one in five numbers from your text-to-SQL feature is wrong. Find which, and why, before they stop trusting all of them.

A query that errors is a bug. A query that runs and returns a plausible wrong number is a product teaching a finance team, one figure at a time, not to trust it. The diagnosis is a classification exercise, and the fix is almost never a better prompt.

Updated Sep 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

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Project: the query runs, the number is wrong, and finance cannot say why →
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◆ WORK SAMPLE · 55 MIN · RUNS LOCALLY

Now do it: Explain why finance's SQL is wrong

A text-to-SQL pilot returns a plausible wrong number for Q2 revenue. Three independent defects, two of which move the total in opposite directions. Fix the query, then explain it to a finance lead.

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FEDITOR'S NOTE

Strong candidates refuse to touch the prompt until they have sorted the misses into classes, because the four common classes have four different fixes and only one of them lives in the model. The second thing being scored is whether they know that exact-match on SQL text is the wrong metric and that execution accuracy against a golden result set is the right one. Anyone who proposes 'add more examples to the prompt' as the first move has answered a different question.

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