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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
1.2 KiB
Plaintext
33 lines
1.2 KiB
Plaintext
---
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title: "Views"
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sidebarTitle: "View"
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description: "A saved query, evaluated when read."
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icon: eye
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keywords: ["view", "create view", "sql", "catalog"]
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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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A view saves a query that you can refer to by name. Reading the view executes
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that query against the source tables, using their read-consistency behavior.
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Views do not store a separate copy of the result.
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It is the counterpart to a
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[materialized view](/management/materialized-view), which stores rows and is
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brought up to date by a refresh. Both are [catalog objects](/basics/catalog)
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defined by a query; choose a materialized view when you need to store and reuse the result.
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| | View | Materialized view |
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| --- | --- | --- |
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| Stores | the query | the rows |
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| Freshness | follows source-table reads | as of the last refresh |
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| Read cost | executes the saved query | queries the stored result |
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| Write cost | none | a refresh |
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Views are created in LanceDB Enterprise, either in SQL over the
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[Flight SQL endpoint](/sql#connecting) or with the SDKs' `create_view` /
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`createView`, which send the query to the deployment. Either way, the deployment
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must have views enabled. See [View](/sql/ddl/view) for `CREATE VIEW`,
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`DROP VIEW`, and listing.
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