Difference between revisions of "Union"
From SQLZOO
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List a number of SELECT statements separated by the UNION key word. Be sure that you have the same number of columns in each of the SELECT statements. | List a number of SELECT statements separated by the UNION key word. Be sure that you have the same number of columns in each of the SELECT statements. | ||
</div> | </div> | ||
| − | <source lang=sql class='tidy'>DROP TABLE bbc;</source> | + | <source lang=sql class='tidy'>DROP TABLE bbc; |
| + | DROP TABLE actor;</source> | ||
<source lang=sql class='setup'>CREATE TABLE bbc (name VARCHAR(10), region VARCHAR(10)); | <source lang=sql class='setup'>CREATE TABLE bbc (name VARCHAR(10), region VARCHAR(10)); | ||
INSERT INTO bbc VALUES ('Poland', 'Europe'); | INSERT INTO bbc VALUES ('Poland', 'Europe'); | ||
INSERT INTO bbc VALUES ('Japan', 'Asia'); | INSERT INTO bbc VALUES ('Japan', 'Asia'); | ||
| + | INSERT INTO bbc VALUES ('Zambia', 'Africa'); | ||
| + | CREATE TABLE actor(name VARCHAR(30), id INT); | ||
| + | INSERT INTO actor VALUES ('Zack Williams', '1'); | ||
| + | INSERT INTO actor VALUES ('Zoltán Fábri', '2'); | ||
| + | INSERT INTO actor VALUES ('Jean Claude Van Damme', '3'); | ||
</source> | </source> | ||
Revision as of 11:09, 12 July 2012
Make union between different tables to build one single view or request?
schema:scott
List a number of SELECT statements separated by the UNION key word. Be sure that you have the same number of columns in each of the SELECT statements.
DROP TABLE bbc; DROP TABLE actor;
CREATE TABLE bbc (name VARCHAR(10), region VARCHAR(10)); INSERT INTO bbc VALUES ('Poland', 'Europe'); INSERT INTO bbc VALUES ('Japan', 'Asia'); INSERT INTO bbc VALUES ('Zambia', 'Africa'); CREATE TABLE actor(name VARCHAR(30), id INT); INSERT INTO actor VALUES ('Zack Williams', '1'); INSERT INTO actor VALUES ('Zoltán Fábri', '2'); INSERT INTO actor VALUES ('Jean Claude Van Damme', '3');
SELECT name FROM actor WHERE name LIKE 'Z%' UNION SELECT name FROM bbc WHERE name LIKE 'Z%'
SELECT name FROM actor WHERE name LIKE 'Z%' UNION SELECT name FROM bbc WHERE name LIKE 'Z%'
SELECT name FROM actor WHERE name LIKE 'Z%' UNION SELECT name FROM bbc WHERE name LIKE 'Z%'
SELECT name FROM actor WHERE name LIKE 'Z%' UNION SELECT name FROM bbc WHERE name LIKE 'Z%'
UNION will be available from version 4
