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How do relational database indexes affect the performance of text-to-SQL generation tools, and what schema optimizations make it easier for language models to write accurate queries?

ChatGPTgpt-61 query11/1/2026
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The searches the AI actually ran for this prompt.

SEED QUERY
How do relational database indexes affect the performance of text-to-SQL generation tools, and what schema optimizations make it easier for language models to write accurate queries?
1 real search · 1 real-search pass
text-to-SQL schema design database indexes query generation accuracy schema linking foreign keys benchmarks best practicesGoogle ↗
OBSERVEDInstruction

Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.

Query classes

Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.

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Classes come from the query-classifier (a local Laya model). 1 of 1 calls are low-confidence (under 50%) — hover a query in the table to see its confidence.

Searches and sources

Queries

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Query / typeSearchIntentQuery classRouting formatClusterFreq ↓Weight
text-to-SQL schema design database indexes query generation accuracy schema linking foreign keys benchmarks best practices
OBSERVED
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