SORTKEY

Description

The keyword that specifies that the column is the sort key for the table. In Snowflake, SORTKEY from Redshift can be migrated to CLUSTER BY because both optimize data storage for query performance. CLUSTER BY in Snowflake organizes data on specified columns, similar to how SORTKEY orders data in Redshift.

Click here to navigate to the Amazon Redshift docs page for this syntax.

Grammar Syntax

[ COMPOUND | INTERLEAVED ] SORTKEY( column_name [, ...] )

Sample Source Patterns

Input Code:

Redshift

IN -> Redshift_01.sql

CREATE TABLE table1 (
    col1,
    col2,
    col3,
    col4
)
COMPOUND SORTKEY (col1, col3)
AS SELECT * FROM table_test;

CREATE TABLE table2 (
    col1
)
INTERLEAVED SORTKEY (col1)
AS SELECT * FROM table_test;

CREATE TABLE table3 (
    col1
)
SORTKEY (col1)
AS SELECT * FROM table_test;

Output Code:

Snowflake

OUT -> Redshift_01.sql

CREATE TABLE table1
COMMENT = '{ "origin": "sf_sc", "name": "snowconvert", "version": {  "major": 0,  "minor": 0,  "patch": "0" }, "attributes": {  "component": "redshift",  "convertedOn": "09/17/2024" }}'
(
    col1,
    col2,
    col3,
    col4
)
--** SSC-FDM-RS0002 - THE PERFORMANCE OF THE CLUSTER BY MAY VARY COMPARED TO THE PERFORMANCE OF SORTKEY **
CLUSTER BY (col1, col3)
AS SELECT * FROM
        table_test;

CREATE TABLE table2
COMMENT = '{ "origin": "sf_sc", "name": "snowconvert", "version": {  "major": 0,  "minor": 0,  "patch": "0" }, "attributes": {  "component": "redshift",  "convertedOn": "09/17/2024" }}'
(
    col1
)
--** SSC-FDM-RS0002 - THE PERFORMANCE OF THE CLUSTER BY MAY VARY COMPARED TO THE PERFORMANCE OF SORTKEY **
CLUSTER BY (col1)
AS SELECT * FROM
        table_test;

CREATE TABLE table3
COMMENT = '{ "origin": "sf_sc", "name": "snowconvert", "version": {  "major": 0,  "minor": 0,  "patch": "0" }, "attributes": {  "component": "redshift",  "convertedOn": "09/17/2024" }}'
(
    col1
)
--** SSC-FDM-RS0002 - THE PERFORMANCE OF THE CLUSTER BY MAY VARY COMPARED TO THE PERFORMANCE OF SORTKEY **
CLUSTER BY (col1)
AS SELECT * FROM
        table_test;

Related EWIs

1. SSC-FDM-RS0002: The performance of the CLUSTER BY may vary compared to the performance of Sortkey.