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sql set

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Lorenzo Satta Chiris answered on January 7, 2021 Popularity 10/10 Helpfulness 4/10

answer sql set

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sql set

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Used alongside UPDATE to update existing data in a table.
Example: Updates the value and quantity values for an order with an id of
642 in the orders table.
UPDATE orders
SET value = 19.49, quantity = 2
WHERE id = 642;

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Contributed on Jan 07 2021

Lorenzo Satta Chiris

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-- <OPERATION> can be replaced with following keywords:
-- UNION : all values without duplicates
--  UNION ALL : all values including duplicates
-- INTERSECT: all common values
-- EXCEPT : values that exist in the first entry table only and does not exist in the second entry table
SELECT id, name FROM table1
<OPERATION>
SELECT id, name FROM table2;

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Contributed on Jan 19 2024

Innocent Iguana

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sets in sql

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-- Creating a sample table
CREATE TABLE employees (
  id INT,
  name VARCHAR(50)
);

-- Inserting data into the table
INSERT INTO employees (id, name) VALUES (1, 'John');
INSERT INTO employees (id, name) VALUES (2, 'Jane');
INSERT INTO employees (id, name) VALUES (3, 'Michael');
INSERT INTO employees (id, name) VALUES (4, 'Emily');

-- Query to get a union of two sets
SELECT name FROM employees
UNION
SELECT name FROM other_employees;

-- Query to get an intersection of two sets
SELECT name FROM employees
INTERSECT
SELECT name FROM other_employees;

-- Query to get a difference between two sets
SELECT name FROM employees
EXCEPT
SELECT name FROM other_employees;

-- Query to get a Cartesian product of two sets
SELECT *
FROM employees, departments;

-- Query to get the number of elements in a set
SELECT COUNT(*) AS set_size FROM employees;

-- Query to check if a value is present in a set
SELECT COUNT(*) FROM employees
WHERE id = 2;

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Contributed on Sep 11 2023

YOU.com

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