{"id":1298,"date":"2008-12-11T15:15:01","date_gmt":"2008-12-11T05:15:01","guid":{"rendered":"http:\/\/www.flamingspork.com\/blog\/?p=1298"},"modified":"2008-12-11T15:15:23","modified_gmt":"2008-12-11T05:15:23","slug":"stewart-learns-more-sql-oddities-or-wtfs","status":"publish","type":"post","link":"https:\/\/www.flamingspork.com\/blog\/2008\/12\/11\/stewart-learns-more-sql-oddities-or-wtfs\/","title":{"rendered":"Stewart learns more SQL oddities (or WTFs)"},"content":{"rendered":"<p>In what situation will this succeed:<\/p>\n<p>ALTER TABLE t1 RENAME t2;<\/p>\n<p>but this fail:<\/p>\n<p>RENAME TABLE t1 TO t2;<\/p>\n<p>?<\/p>\n<p>Highlight the white text below for the answer:<\/p>\n<p><span style=\"color: #ffffff;\">When t1 is a temporary table.<\/span><\/p>\n<p>Wow&#8230; I wonder why that is, I can&#8217;t think of any good reason&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>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&#8230; I wonder why that is, &hellip; <a href=\"https:\/\/www.flamingspork.com\/blog\/2008\/12\/11\/stewart-learns-more-sql-oddities-or-wtfs\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/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":[75,1,14],"tags":[],"class_list":["post-1298","post","type-post","status-publish","format-standard","hentry","category-drizzle-work-et-al","category-general","category-mysql"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5a6n8-kW","jetpack-related-posts":[{"id":2307,"url":"https:\/\/www.flamingspork.com\/blog\/2011\/03\/01\/alter-table-rename-rename-rename\/","url_meta":{"origin":1298,"position":0},"title":"ALTER TABLE RENAME RENAME RENAME","author":"Stewart Smith","date":"2011-03-01","format":false,"excerpt":"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 a) you think it does and then b) if you\u2026","rel":"","context":"In &quot;drizzle&quot;","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":1298,"position":1},"title":"Stewart learns SQL oddities&#8230;","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 &quot;mysql&quot;","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":1298,"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 &quot;drizzle&quot;","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":2282,"url":"https:\/\/www.flamingspork.com\/blog\/2011\/02\/04\/implicit-commit-considered-harmful\/","url_meta":{"origin":1298,"position":3},"title":"Implicit COMMIT considered harmful.","author":"Stewart Smith","date":"2011-02-04","format":false,"excerpt":"If you execute the following, what does your RDBMS do? CREATE TABLE t1 (a int); START TRANSACTION; INSERT INTO t1 (a) VALUES (1); START TRANSACTION; INSERT INTO t1 (a) VALUES (2); ROLLBACK; SELECT * FROM t1; The answer may surprise you.","rel":"","context":"In &quot;drizzle&quot;","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":578,"url":"https:\/\/www.flamingspork.com\/blog\/2006\/02\/15\/information_schemafiles-querying-disk-usage-from-sql\/","url_meta":{"origin":1298,"position":4},"title":"INFORMATION_SCHEMA.FILES (querying disk usage from SQL)","author":"Stewart Smith","date":"2006-02-15","format":false,"excerpt":"In MySQL 5.1.6 there's a new INFORMATION_SCHEMA table. Currently, it only has information on files for NDB but we're hoping to change that in a future release (read: I think it would be neat). This table is a table generated by the MySQL server listing all the different files that\u2026","rel":"","context":"In &quot;mysql&quot;","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":1383,"url":"https:\/\/www.flamingspork.com\/blog\/2009\/02\/02\/row-id-in-mysql-and-drizzle-and-the-engines\/","url_meta":{"origin":1298,"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 &quot;drizzle&quot;","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\/1298","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=1298"}],"version-history":[{"count":3,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/posts\/1298\/revisions"}],"predecessor-version":[{"id":1301,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/posts\/1298\/revisions\/1301"}],"wp:attachment":[{"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/media?parent=1298"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/categories?post=1298"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.flamingspork.com\/blog\/wp-json\/wp\/v2\/tags?post=1298"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}