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SELECT list

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Description

The SELECT list names the columns, functions, and expressions that you want the query to return. The list represents the output of the query. (Redshift SQL Language Reference SELECT list)

The query start options are fully supported in Snowflake. Just keep in mind that in Snowflake the DISTINCT and ALL options must go at the beginning of the query.

In Redshift, if your application allows foreign keys or invalid primary keys, it can cause queries to return incorrect results. For example, a SELECT DISTINCT query could return duplicate rows if the primary key column does not contain all unique values. (Redshift SQL Language Reference SELECT list)

Grammar Syntax

SELECT
[ TOP number ]
[ ALL | DISTINCT ] * | expression [ AS column_alias ] [, ...]

Sample Source Patterns

Top clause

Input Code:

IN -> Redshift_01.sql
CREATE TABLE employee (
  id INT,
  name VARCHAR(20),
  manager_id INT
);
  
INSERT INTO employee(id, name, manager_id) VALUES
(100, 'Carlos', null),
(101, 'John', 100),
(102, 'Jorge', 101),
(103, 'Kwaku', 101),
(110, 'Liu', 101),
(106, 'Mateo', 102),
(110, 'Nikki', 103),
(104, 'Paulo', 103),
(105, 'Richard', 103),
(120, 'Saanvi', 104),
(200, 'Shirley', 104),
(201, 'Sofía', 102),
(205, 'Zhang', 104);
  
SELECT TOP 5 id, name, manager_id
FROM employee;

Output Code:

OUT -> Redshift_01.sql
CREATE TABLE employee (
  id INT,
  name VARCHAR(20),
  manager_id INT
)
COMMENT = '{ "origin": "sf_sc", "name": "snowconvert", "version": {  "major": 0,  "minor": 0,  "patch": "0" }, "attributes": {  "component": "redshift",  "convertedOn": "11/05/2024",  "domain": "test" }}';

INSERT INTO employee (id, name, manager_id) VALUES
(100, 'Carlos', null),
(101, 'John', 100),
(102, 'Jorge', 101),
(103, 'Kwaku', 101),
(110, 'Liu', 101),
(106, 'Mateo', 102),
(110, 'Nikki', 103),
(104, 'Paulo', 103),
(105, 'Richard', 103),
(120, 'Saanvi', 104),
(200, 'Shirley', 104),
(201, 'Sofía', 102),
(205, 'Zhang', 104);

SELECT TOP 5 id, name, manager_id
FROM
    employee;

ALL

Input Code:

IN -> Redshift_02.sql
SELECT ALL manager_id
FROM employee;

Output Code:

OUT -> Redshift_02.sql
SELECT ALL manager_id
FROM
    employee;

DISTINCT

Input Code:

IN -> Redshift_03.sql
SELECT DISTINCT manager_id
FROM employee;

Output Code:

OUT -> Redshift_03.sql
SELECT DISTINCT manager_id
FROM 
    employee;

Related EWIs

There are no known issues.

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