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

3 votes351 views2 answers
Brew start mysql
SQL
5 votes374 views1 answer
Oracle add time to date
SQL
0 vote354 views1 answer
Adding conditions in MERGE statement in Oracle SQL for INSERT/UPDATE
SQL
2 votes356 views4 answers
Sql query interview questions
SQL
-2 votes363 views2 answers
Union vs union all in sql
SQL
0 vote374 views1 answer
Databricks install odbc driver connect to sql server
SQL
0 vote383 views1 answer
Illuminate/Database/QueryException with message 'SQLSTATE[42S02]
SQL
6 votes440 views3 answers
What is where in sql
SQL
0 vote388 views1 answer
SQL: calculate hours from two dates
SQL
6 votes374 views1 answer
How to get the size of the database in postgresql
SQL