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

Union in sql

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

-2

Similar codes

1 vote160 views1 answer
Ubuntu mysql cannot connect to database server remote
SQL
31 votes166 views3 answers
Sql count
SQL
12 votes154 views4 answers
Mysql version
SQL
8 votes197 views1 answer
Mysql dump restore
SQL
0 vote147 views1 answer
Qt qsql check if table exist
SQL
0 vote189 views1 answer
SQL-Arten
SQL
0 vote160 views1 answer
Querry mysql by 2 columns
SQL
25 votes151 views6 answers
Sql update query
SQL
3 votes162 views2 answers
Truncate table
SQL
0 vote177 views1 answer
Sql server insert inner join
SQL