What is union in sql

Sql union

-- UNION: distinct values (slower)
SELECT emp_name AS name from employees
UNION       
SELECT cust_name AS name from customers;

-- UNION ALL: keeps duplicates (faster)
SELECT emp_name AS name from employees
UNION ALL      
SELECT cust_name AS name from customers;

Union SQL

SQL> SELECT  ID, NAME, AMOUNT, DATE
   FROM CUSTOMERS
   LEFT JOIN ORDERS
   ON CUSTOMERS.ID = ORDERS.CUSTOMER_ID
UNION
   SELECT  ID, NAME, AMOUNT, DATE
   FROM CUSTOMERS
   RIGHT JOIN ORDERS
   ON CUSTOMERS.ID = ORDERS.CUSTOMER_ID;

Source: tutorialspoint.com

What is union in sql

UNION:
COMBINES THE RESULT OF 2 QUERY AND
REMOVES DUPLICATE ROWS AND
SORTS BY FIRST COLUMN

-2

Similar codes

1 vote240 views1 answer
Increase existing date in sql
SQL
2 votes230 views1 answer
Mysql set value as null
SQL
0 vote204 views1 answer
Sql how to display two atributes as one in sql
SQL
6 votes217 views2 answers
Database url postgres
SQL
0 vote220 views1 answer
How to write if case in select query in select statement
SQL
2 votes217 views1 answer
Brew start postgres manual
SQL
6 votes226 views2 answers
Postgresql restore from dump
SQL
0 vote243 views2 answers
Clauses in mysql
SQL
6 votes269 views2 answers
How to get last element sql
SQL
0 vote238 views1 answer
One table with another
SQL