{"id":2307,"date":"2011-03-01T21:37:23","date_gmt":"2011-03-01T11:37:23","guid":{"rendered":"http:\/\/www.flamingspork.com\/blog\/?p=2307"},"modified":"2011-03-01T21:37:23","modified_gmt":"2011-03-01T11:37:23","slug":"alter-table-rename-rename-rename","status":"publish","type":"post","link":"https:\/\/www.flamingspork.com\/blog\/2011\/03\/01\/alter-table-rename-rename-rename\/","title":{"rendered":"ALTER TABLE RENAME RENAME RENAME"},"content":{"rendered":"

Here’s a nice challenge for you. What does the following do (or error out on?):<\/p>\n

CREATE TABLE t1 (a int);\r\nCREATE TABLE t2 (b int);\r\nALTER TABLE t1 RENAME t3, RENAME t2, RENAME t4;<\/pre>\n
I’d be interested to know what a) you think it does and then b) if you were surprised when you went and typed it into your RDBMS of choice.<\/p>\n","protected":false},"excerpt":{"rendered":"
Here’s a nice challenge for you. What does the following do (or error out on?): CREATE TABLE t1 (a int); CREATE TABLE t2 (b int); ALTER TABLE t1 RENAME t3, RENAME t2, RENAME t4; I’d be interested to know what … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[75,14],"tags":[269,70,628,411,109],"class_list":["post-2307","post","type-post","status-publish","format-standard","hentry","category-drizzle-work-et-al","category-mysql","tag-ddl","tag-drizzle","tag-mysql","tag-oddity","tag-sql"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5a6n8-Bd","jetpack-related-posts":[{"id":1298,"url":"https:\/\/www.flamingspork.com\/blog\/2008\/12\/11\/stewart-learns-more-sql-oddities-or-wtfs\/","url_meta":{"origin":2307,"position":0},"title":"Stewart learns more SQL oddities (or WTFs)","author":"Stewart Smith","date":"2008-12-11","format":false,"excerpt":"In what situation will this succeed: ALTER TABLE t1 RENAME t2; but this fail: RENAME TABLE t1 TO t2; ? Highlight the white text below for the answer: When t1 is a temporary table. Wow... I wonder why that is, I can't think of any good reason...","rel":"","context":"In "drizzle"","block_context":{"text":"drizzle","link":"https:\/\/www.flamingspork.com\/blog\/category\/work-et-al\/drizzle-work-et-al\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1292,"url":"https:\/\/www.flamingspork.com\/blog\/2008\/12\/10\/stewart-learns-sql-oddities\/","url_meta":{"origin":2307,"position":1},"title":"Stewart learns SQL oddities…","author":"Stewart Smith","date":"2008-12-10","format":false,"excerpt":"What would you expect the following to fail with? CREATE TABLE t1 (a int, b int); insert into t1 values (100,100); CREATE TEMPORARY TABLE t2 (a int, b int, primary key (a)); BEGIN; INSERT INTO t2 values(100,100); CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) select * from\u2026","rel":"","context":"In "mysql"","block_context":{"text":"mysql","link":"https:\/\/www.flamingspork.com\/blog\/category\/work-et-al\/mysql\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2310,"url":"https:\/\/www.flamingspork.com\/blog\/2011\/03\/03\/sql-oddity-alter-table-and-default-values\/","url_meta":{"origin":2307,"position":2},"title":"SQL Oddity: ALTER TABLE and default values","author":"Stewart Smith","date":"2011-03-03","format":false,"excerpt":"\u00ef\u00bb\u00bfSo, the MySQL (and Drizzle) ALTER TABLE syntax allows you to easily change the default value of a column. For example: CREATE TABLE t1 (answer int); ALTER TABLE t1 ALTER answer SET DEFAULT 42; So, you create a TIMESTAMP column and forgot to set the default value to CURRENT_TIMESTAMP. Easy,\u2026","rel":"","context":"In "drizzle"","block_context":{"text":"drizzle","link":"https:\/\/www.flamingspork.com\/blog\/category\/work-et-al\/drizzle-work-et-al\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1576,"url":"https:\/\/www.flamingspork.com\/blog\/2009\/02\/25\/no-implicit-defaults\/","url_meta":{"origin":2307,"position":3},"title":"No implicit defaults","author":"Stewart Smith","date":"2009-02-25","format":false,"excerpt":"See also: MySQL Bug 43151 The MySQL Manual proudly states that you don't get implicit default values if strict mode. mysql> set sql_mode='STRICT_ALL_TABLES'; Query OK, 0 rows affected (0.00 sec) mysql> create table t1 (a int, b int, c int, d int, e int, f int, g int, h int,i\u2026","rel":"","context":"In "drizzle"","block_context":{"text":"drizzle","link":"https:\/\/www.flamingspork.com\/blog\/category\/work-et-al\/drizzle-work-et-al\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1655,"url":"https:\/\/www.flamingspork.com\/blog\/2009\/06\/09\/drizzle-pluggable-metadatastore-or-no-table-definition-file-on-disk\/","url_meta":{"origin":2307,"position":4},"title":"Drizzle pluggable MetadataStore (or: no table definition file on disk)","author":"Stewart Smith","date":"2009-06-09","format":false,"excerpt":"My code is shaping up rather nicely (see https:\/\/code.launchpad.net\/~stewart\/drizzle\/discovery) and I'm planning to submit a merge-request for it later today. I'm about to commit code that implements a MetadataStore for the ARCHIVE engine. This means that for ARCHIVE tables, you only have the .ARZ file on disk. The table definition\u2026","rel":"","context":"In "General"","block_context":{"text":"General","link":"https:\/\/www.flamingspork.com\/blog\/category\/general\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1383,"url":"https:\/\/www.flamingspork.com\/blog\/2009\/02\/02\/row-id-in-mysql-and-drizzle-and-the-engines\/","url_meta":{"origin":2307,"position":5},"title":"row id in MySQL and Drizzle (and the engines)","author":"Stewart Smith","date":"2009-02-02","format":false,"excerpt":"Some database engines have a fundamental concept of a row id. The row id is everything you need to know to locate a row. Common uses include secondary indexes (key is what's indexed, value is rowid which you then use to lookup the row). One design is the InnoDB method\u2026","rel":"","context":"In "drizzle"","block_context":{"text":"drizzle","link":"https:\/\/www.flamingspork.com\/blog\/category\/work-et-al\/drizzle-work-et-al\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/posts\/2307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/comments?post=2307"}],"version-history":[{"count":1,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/posts\/2307\/revisions"}],"predecessor-version":[{"id":2308,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/posts\/2307\/revisions\/2308"}],"wp:attachment":[{"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/media?parent=2307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/categories?post=2307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/tags?post=2307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}