Difference between revisions of "ALTER TABLE ... DROP COLUMN"

Latest revision as of 15:04, 17 July 2012

Delete a column from a table

schema:scott

This is in the SQL standard ALTER TABLE

DROP TABLE a

CREATE TABLE a(x INTEGER, y INTEGER);
INSERT INTO a VALUES (1,2);

ALTER TABLE a DROP COLUMN y;
SELECT * FROM a;

ALTER TABLE a DROP y;
SELECT * FROM a;

ALTER TABLE ... DROP COLUMN

ALTER TABLE ... ADD constraint

@@ Line 12: / Line 12: @@
 </source>
-<source lang='sql' class='def'>ALTER TABLE a DROP COLUMN y
+<source lang='sql' class='def'>ALTER TABLE a DROP COLUMN y;
+SELECT * FROM a;
 </source>
-<source lang='sql' class='def e-sybase'>ALTER TABLE a DROP y
+<source lang='sql' class='def e-sybase'>ALTER TABLE a DROP y;
+SELECT * FROM a;
 </source>
 <div class="ecomm e-oracle" style="display: none">
-<a href="http://sqlzoo.napier.ac.uk/big/B/s/a/statements_32a.htm#2103928">ALTER TABLE t DROP COLUMN c</a>
+[http://sqlzoo.napier.ac.uk/big/B/s/a/statements_32a.htm#2103928 ALTER TABLE t DROP COLUMN c]
 </div>
 <div class="ecomm e-db2" style="display: none">
-<a href="https://aurora.vcu.edu/db2help/db2s0/frame3.htm#sqls0604">
+[https://aurora.vcu.edu/db2help/db2s0/frame3.htm#sqls0604
-ALTER TABLE documentation.</a><br/>
+ALTER TABLE documentation.]<br/>
 DB2 seemingly does not permit this operation - any help would be appreciated.
 </div>
 <div class="ecomm e-sybase" style="display: none"> Sybase doesn't like the COLUMN keyword.</div>
-<div class="ecomm e-postgres" style="display: none"><a href="http://www.ca.postgresql.org/users-lounge/docs/7.0/user/sql-altertable.htm">ALTER TABLE</a></div>
+<div class="ecomm e-postgres" style="display: none">[http://www.ca.postgresql.org/users-lounge/docs/7.0/user/sql-altertable.htm ALTER TABLE]</div>
 </div>
 {{CREATE and DROP ref}}