UNION, INTERSECT, and EXCEPT

Important Notice: Migration of Documentation Website

Please be advised that our documentation website is currently undergoing a migration to a new platform. To ensure you have access to the most up-to-date information, we kindly request that you visit our new documentation website located at:

Official Snowflake Snowconvert Documentation

For any immediate assistance or if you encounter any issues, please contact our support team at [email protected].

Thank you for your understanding.

Description

The UNION, INTERSECT, and EXCEPT set operators are used to compare and merge the results of two separate query expressions. (Redshift SQL Language Reference Set Operators)

Set operators are fully supported in Snowflake.

Grammar Syntax

query
{ UNION [ ALL ] | INTERSECT | EXCEPT | MINUS }
query

Sample Source Patterns

Input Code:

Redshift

IN -> Redshift_01.sql

SELECT id, name, manager_id
INTO some_employees
FROM
employee
WHERE manager_id = 101

UNION

SELECT id, name, manager_id
FROM
employee
WHERE manager_id = 102

UNION ALL

SELECT id, name, manager_id
FROM
employee
WHERE manager_id = 101

INTERSECT

SELECT id, name, manager_id
FROM
employee
WHERE manager_id = 103

EXCEPT

SELECT id, name, manager_id
FROM
employee
WHERE manager_id = 104;

Results

Output Code:

Snowflake

OUT -> Redshift_01.sql

CREATE TABLE IF NOT EXISTS some_employees AS
SELECT id, name, manager_id
FROM
employee
WHERE manager_id = 101

UNION

SELECT id, name, manager_id
FROM
employee
WHERE manager_id = 102

UNION ALL

SELECT id, name, manager_id
FROM
employee
WHERE manager_id = 101

INTERSECT

SELECT id, name, manager_id
FROM
employee
WHERE manager_id = 103

EXCEPT

SELECT id, name, manager_id
FROM
employee
WHERE manager_id = 104;

Results

Known Issues

There are no known issues.

Related EWIs.

There are no related EWIs.