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 vote198 views1 answer
What is between keyword used for
SQL
3 votes177 views1 answer
Oracle nextval
SQL
1 vote210 views1 answer
Sql server cast date dd/mm/yyyy
SQL
0 vote196 views1 answer
Psql use query result convert Decimal python numpy psycopg2
SQL
0 vote160 views1 answer
Mysql timeout 30 seconds
SQL
0 vote205 views1 answer
Mysql shell set time_zone
SQL
3 votes178 views1 answer
Postgresql if null then 0
SQL
1 vote212 views2 answers
Create a unqie constraint mysql
SQL
2 votes187 views2 answers
Oracle create table if not exists
SQL
4 votes192 views1 answer
Check database name postgresql
SQL