mirror of
https://github.com/lancedb/lancedb.git
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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.
33 lines
1011 B
Plaintext
33 lines
1011 B
Plaintext
---
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title: "Delete"
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sidebarTitle: "Delete"
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description: "DELETE FROM ... WHERE: rows are marked, not erased."
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icon: trash
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keywords: ["delete", "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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DELETE FROM documents WHERE created_at < TIMESTAMP '2025-01-01 00:00:00'
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```
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Compare a timestamp column with a typed literal, as above, or with
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`CAST('2025-01-01' AS TIMESTAMP)`. A bare string such as `'2025-01-01'` is
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rejected in a `DELETE` predicate, even though a `SELECT` accepts it.
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Deletion marks rows rather than erasing them, so the data remains recoverable
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for as long as the version holding it survives
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[retention](/maintenance/cleanup).
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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="Delete" icon="trash" href="/ingestion/delete">
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The SDK equivalent.
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</Card>
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