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 vote257 views1 answer
Mysql enter ubuntu
SQL
0 vote192 views1 answer
Set column width in sqlplus
SQL
1 vote152 views1 answer
Postgres division by zero
SQL
0 vote214 views1 answer
Oracle query to find schema you are working on
SQL
2 votes205 views2 answers
Run mysql command from bash
SQL
0 vote210 views1 answer
Java nosql sort
SQL
0 vote200 views1 answer
Python sql last insertend
SQL
3 votes303 views1 answer
Postgresql today - 1 year
SQL
1 vote221 views1 answer
Tsql update datetime
SQL
1 vote206 views1 answer
Check message id sql server
SQL