ClickHouse/docs/en/sql-reference/table-functions/null.md

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53	null function

null

Accepts an inserted data of the specified structure and immediately drops it away. The function is used for convenience writing tests and demonstrations.

Syntax

null('structure')

Parameter

• structure — A list of columns and column types. String.

Returned value

A table with the specified structure, which is dropped right after the query execution.

Example

Query with the null function:

INSERT INTO function null('x UInt64') SELECT * FROM numbers_mt(1000000000);

can replace three queries:

CREATE TABLE t (x UInt64) ENGINE = Null;
INSERT INTO t SELECT * FROM numbers_mt(1000000000);
DROP TABLE IF EXISTS t;

See also: format Null.

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