Difference between revisions of "Union"
From SQLZOO
| Line 1: | Line 1: | ||
Make union between different tables to build one single view or request? | Make union between different tables to build one single view or request? | ||
<div class='ht'> | <div class='ht'> | ||
| + | <div class=params>schema:scott</div> | ||
<div> | <div> | ||
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'>CREATE TABLE bbc (name VARCHAR(10), region VARCHAR(10)); | + | <source lang=sql class='tidy'>DROP TABLE bbc;</source> |
| + | <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'); | ||
</source> | </source> | ||
| + | |||
<source lang='sql' class='def e-access'> | <source lang='sql' class='def e-access'> | ||
SELECT name FROM actor WHERE name LIKE 'Z%' | SELECT name FROM actor WHERE name LIKE 'Z%' | ||
Revision as of 10:58, 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;
CREATE TABLE bbc (name VARCHAR(10), region VARCHAR(10)); INSERT INTO bbc VALUES ('Poland', 'Europe'); INSERT INTO bbc VALUES ('Japan', 'Asia');
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
