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

0 vote298 views1 answer
Sql drop default
SQL
0 vote317 views2 answers
Mysql decimal remove trailing zeros
SQL
0 vote304 views1 answer
User, group, or role 'open' already exists in the current database.
SQL
0 vote261 views1 answer
Postgres delete where id in
SQL
16 votes311 views1 answer
Mssql int max value
SQL
0 vote302 views1 answer
Mysql add root password
SQL
0 vote341 views1 answer
How to find all children of a record with only parent ID in sql
SQL
2 votes313 views1 answer
How to insert string variable into sqlite database
SQL
4 votes327 views1 answer
Mysql query first character
SQL
0 vote331 views1 answer
Select sql in descending order
SQL