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percentile_empty

Description​

Constructs a PERCENTILE value, which is used to fill in null values for data loading using Stream Load or INSERT INTO.

Syntax​

PERCENTILE_EMPTY();

Parameters​

None

Return value​

Returns a PERCENTILE value.

Examples​

Create a table. The percent column is a PERCENTILE column.

CREATE TABLE `aggregate_tbl` (
  `site_id` largeint(40) NOT NULL COMMENT "id of site",
  `date` date NOT NULL COMMENT "time of event",
  `city_code` varchar(20) NULL COMMENT "city_code of user",
  `pv` bigint(20) SUM NULL DEFAULT "0" COMMENT "total page views",
  `percent` PERCENTILE PERCENTILE_UNION COMMENT "others"
) ENGINE=OLAP
AGGREGATE KEY(`site_id`, `date`, `city_code`)
COMMENT "OLAP"
DISTRIBUTED BY HASH(`site_id`)
PROPERTIES ("replication_num" = "3");

Insert data into the table.

INSERT INTO aggregate_tbl VALUES
(5, '2020-02-23', 'city_code', 555, percentile_empty());