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ClickHouse/docs/en/sql-reference/statements/alter/named-collection.md
Salvatore Mesoraca 7d206cbc3c
NamedCollections: prevent fields overriding in functions call 
Add syntax in SQL and XML to mark specific fields to allow
override or not.
Also add a new setting to control the default behaviour when
overriding support is not specified.
2023-11-09 17:25:16 +01:00

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/en/sql-reference/statements/alter/named-collection NAMED COLLECTION

ALTER NAMED COLLECTION

This query intends to modify already existing named collections.

Syntax

ALTER NAMED COLLECTION [IF EXISTS] name [ON CLUSTER cluster]
[ SET
key_name1 = 'some value' [[NOT] OVERRIDABLE],
key_name2 = 'some value' [[NOT] OVERRIDABLE],
key_name3 = 'some value' [[NOT] OVERRIDABLE],
... ] |
[ DELETE key_name4, key_name5, ... ]

Example

CREATE NAMED COLLECTION foobar AS a = '1' NOT OVERRIDABLE, b = '2';

ALTER NAMED COLLECTION foobar SET a = '2' OVERRIDABLE, c = '3';

ALTER NAMED COLLECTION foobar DELETE b;