mirror of
https://github.com/lancedb/lancedb.git
synced 2026-10-20 10:42:26 +00:00
Brendan Clement
198812fd53
The existing docs have 254 findings from our shared Vale rules. Contributors would otherwise inherit these when editing the same lines. Clean up the prose across 80 pages: correct product names and a repeated word, simplify a few phrases, and replace dashes with punctuation that fits each sentence. The pinned Vale scan now reports zero findings, with no suppressions.
56 lines
1.7 KiB
Plaintext
56 lines
1.7 KiB
Plaintext
---
|
|
title: "Namespace"
|
|
sidebarTitle: "Namespace"
|
|
description: "CREATE SCHEMA and DROP SCHEMA: the SQL spelling of namespace DDL."
|
|
icon: folder-tree
|
|
keywords: ["namespace", "schema", "create schema", "drop schema", "sql"]
|
|
---
|
|
|
|
<Badge color="red">Enterprise</Badge> [SQL runs in LanceDB Enterprise.](/sql)
|
|
|
|
A [namespace](/management/namespace) is addressed in SQL as a `SCHEMA`, the
|
|
standard's name for the same concept.
|
|
|
|
## CREATE SCHEMA {#create}
|
|
|
|
```sql
|
|
CREATE SCHEMA analytics
|
|
CREATE SCHEMA db1.`ns1$ns2`
|
|
CREATE SCHEMA IF NOT EXISTS `ns1$ns2`
|
|
```
|
|
|
|
A nested namespace is one backtick-quoted name with `$` between its
|
|
components: `` db1.`ns1$ns2` `` creates `ns2` inside `ns1` in database `db1`,
|
|
provided `ns1` already exists. The part before the dot is the database, so a
|
|
three-part path such as `db1.ns1.ns2` is rejected. `public` is the database's
|
|
root namespace, which is never created or dropped.
|
|
|
|
`IF NOT EXISTS` makes the statement a no-op rather than an error when the
|
|
namespace is already there.
|
|
|
|
## DROP SCHEMA {#drop}
|
|
|
|
```sql
|
|
DROP SCHEMA db1.analytics
|
|
DROP SCHEMA IF EXISTS `a$b`
|
|
DROP SCHEMA `a$b` RESTRICT
|
|
```
|
|
|
|
<Warning>
|
|
`CASCADE` is rejected: **"DROP SCHEMA CASCADE is not supported; drop the
|
|
objects inside first."** A namespace's tables, views and other objects must be
|
|
dropped explicitly before the namespace itself can go. `RESTRICT` (the
|
|
default) states that requirement rather than changing it.
|
|
</Warning>
|
|
|
|
## What to read next {#next}
|
|
|
|
<CardGroup cols={2}>
|
|
<Card title="Namespace" icon="folder-tree" href="/management/namespace">
|
|
The SDK equivalent, and how a namespace fits the catalog hierarchy.
|
|
</Card>
|
|
<Card title="Table" icon="table" href="/sql/ddl/table">
|
|
Creating tables inside a namespace.
|
|
</Card>
|
|
</CardGroup>
|