mirror of
https://github.com/lancedb/lancedb.git
synced 2026-10-30 15:26:52 +00:00
Jack Ye
ddb318567a
## Summary - Complete the SQL reference: `ATTACH DATABASE`, the `CHANGES` clause, and `dedupe()`/`duplicate_pairs()` (verified against current sophon source; these were recently renamed from `vector_dedup`/`vector_duplicate_pairs`). Fix the blob-column default-projection claim and add the previously undocumented `blob_descriptor()`. - Enrich the gated Functions draft (still `.mintignore`'d, pre-release): chained Functions over blob outputs, GPU-produced blobs, Secrets, multi-input/output binding, `code=[module]` packaging. - Upgrade the materialized-view and computed-column auto-refresh drafts with precise, verified catch-up semantics, and add the missing `ALTER MATERIALIZED VIEW` / `CREATE ... WITH(...)` sections (also gated — the automatic-refresh scheduler is still dev/staging-only). - Thread one running example (video frames → GPU extract/caption → dedup → auto-refreshing materialized view) through Functions, materialized views, and the LeRobotDataset integration guide instead of a separate tutorial. - Rename "LanceDB OSS"/"OSS" to "LanceDB Embedded"/"Embedded" throughout (52 files); activate the existing availability-comparison mechanism on `basics/offerings.mdx` for a full feature-by-feature comparison table.
36 lines
1.1 KiB
Plaintext
36 lines
1.1 KiB
Plaintext
---
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title: "Update"
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sidebarTitle: "Update"
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description: "UPDATE ... SET ... WHERE, and why it does not recompute derived columns."
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icon: pen
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keywords: ["update", "sql"]
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availability:
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embedded: unavailable
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enterprise: available
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---
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```sql
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UPDATE documents SET title = upper(title) WHERE category = 'film'
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```
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Assignments take any expression the [dialect](/sql/functions) supports,
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including references to other columns of the same row. Without a `WHERE`
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clause every row is updated.
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<Warning>
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An update does not recompute [computed columns](/feature-engineering/add-computed-column)
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that derive from the column you changed. Those rows keep the value computed from
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the old input until the next refresh recomputes them. See
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[Guarantees](/basics/guarantees#jobs).
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</Warning>
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Commits a new table version, so [versioning](/management/table#versioning) and
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the [write guarantees](/basics/guarantees#writes) apply, including that the
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version advances even when the statement affects zero rows.
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## What to read next {#next}
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<Card title="Update" icon="pen" href="/ingestion/update">
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The SDK equivalent.
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</Card>
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