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;sql union
Combines the results from 2 or more SELECT statements and returns only
distinct values.
Example: Returns the cities from the events and subscribers tables.
SELECT city FROM events
UNION
SELECT city from subscribers;union and union all in sql server
/* UNION AND UNION ALL*/
union and union all operator in sql server are used to combine the result-set of
two or more select queries.
union remove duplicate rows, where as union all doesn't.
.e.g_
SELECT Column_List from Table_Name
UNION
SELECT Column_List from Table_Name
/--------------------------------------------/
.e.g_
SELECT Column_List from Table_Name
UNION ALL
SELECT Column_List from Table_Name
/* UNION AND JOIN */
Union combine rows from 2 or more tables, where as
join combine columns from 2 or more tables.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;Copyright © 2021 Codeinu
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