What is 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

What is union in sql

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

-2

Similar codes

25 votes221 views6 answers
Change column name mysql
SQL
0 vote129 views1 answer
How to start my sql server on mac
SQL
2 votes195 views2 answers
How to DROP a table in mysql
SQL
0 vote124 views1 answer
Como saber si tengo mysql instalado
SQL
0 vote115 views1 answer
Get who is hired in month in sql
SQL
0 vote143 views1 answer
Reindex mssql table
SQL
1 vote126 views2 answers
ImportError: No module named mysql.connector
SQL
0 vote132 views1 answer
How to import sqlite driver class in java using maven
SQL
-1 vote124 views2 answers
Get day in sql
SQL
0 vote120 views1 answer
Mysql case when on date
SQL