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

0 vote242 views1 answer
Mariadb LOAD DATA INFILE
SQL
-1 vote265 views1 answer
Mysql change database charset and collation
SQL
0 vote244 views1 answer
Update set with join pl sql
SQL
0 vote259 views1 answer
Case insensitive sql
SQL
0 vote268 views1 answer
Set root password mysql xampp
SQL
2 votes259 views1 answer
Mysql trigger after update
SQL
1 vote264 views1 answer
Print all records of table in mysql
SQL
3 votes255 views2 answers
Brew start mysql
SQL
2 votes260 views1 answer
Mariadb JSON_EXTRACT
SQL
5 votes246 views1 answer
Pl sql asynchronous procedure calls
SQL