Table Functions

Table functions are methods for constructing tables.

You can use table functions in:

• FROM clause of the SELECT query.

  The method for creating a temporary table that is available only in the current query. The table is deleted when the query finishes.

• CREATE TABLE AS table_function() query.

  It's one of the methods of creating a table.

• INSERT INTO TABLE FUNCTION query.

warning

You can’t use table functions if the allow_ddl setting is disabled.

Function	Description
file	Creates a File-engine table.
merge	Creates a Merge-engine table.
numbers	Creates a table with a single column filled with integer numbers.
remote	Allows you to access remote servers without creating a Distributed-engine table.
url	Creates a Url-engine table.
mysql	Creates a MySQL-engine table.
postgresql	Creates a PostgreSQL-engine table.
jdbc	Creates a JDBC-engine table.
odbc	Creates a ODBC-engine table.
hdfs	Creates a HDFS-engine table.
s3	Creates a S3-engine table.
sqlite	Creates a sqlite-engine table.

note

Only these table functions are enabled in readonly mode : null, view, viewIfPermitted, numbers, numbers_mt, generateRandom, values, cluster, clusterAllReplicas