CLUSTER BY

Function

This statement is used to bucket a table and sort the table within buckets.

Syntax

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SELECT attr_expr_list FROM table_reference
  CLUSTER BY col_name [,col_name ,...];

Keyword

CLUSTER BY: Buckets are created based on specified fields. Single fields and multiple fields are supported, and data is sorted in buckets.

Precautions

The to-be-sorted table must exist. If this statement is used to sort a table that does not exist, an error is reported.

Example

To bucket the student table according to the score field and sort tables within buckets in descending order, run the following statement:

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SELECT * FROM student
  CLUSTER BY score;