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;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 all
SELECT City FROM Customers
UNION ALL
SELECT City FROM Suppliers
ORDER BY City;union vs union all in sql
UNION ALL:
COMBINES THE RESULT OF 2 QUERY AND
DOESN'T REMOVE DUPLICATE ROWS
AND DOESN'T SORT BY FIRST COLUMN
UNION:
COMBINES THE RESULT OF 2 QUERY AND
REMOVES DUPLICATE ROWS AND
SORTS BY FIRST COLUMNunion 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 all
SELECT City FROM Customers
UNION
SELECT City FROM Suppliers
ORDER BY City;union all in sql
UNION ALL:
COMBINES THE RESULT OF 2 QUERY AND
DOESN'T REMOVE DUPLICATE ROWS
AND DOESN'T SORT BY FIRST COLUMNCopyright © 2021 Codeinu
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