Preview of MySQL Pocket Reference: SQL Functions and Utilities (Pocket Reference (O'Reilly)) by George Reese (27-Jul-2007) Paperback PDF
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Extra info for MySQL Pocket Reference: SQL Functions and Utilities (Pocket Reference (O'Reilly)) by George Reese (27-Jul-2007) Paperback
Upload UNIQUE[name] (column, ... ) provides a different index to the altered desk; just like the upload INDEX assertion. modify [COLUMN] column SET DEFAULT worth Assigns a brand new default price for the desired column. The COLUMN key-phrase is not obligatory and has no impression. modify [COLUMN] column DROP DEFAULT Drops the present default price for the desired column. a brand new default price is assigned to the column according to the CREATE assertion used to create the desk. The COLUMN key-phrase is not obligatory and has no impact. CONVERT TO personality SET charset [COLLATE collation] [DEFAULT] personality SET charset [COLLATE collation] Converts the column to the desired personality set in line with the named collation. swap [COLUMN] column create_clause alter [COLUMN] create_clause [FIRST | AFTER column] Alters the definition of a column. This assertion is used to alter a column from one style to another variety whereas affecting the knowledge as low as attainable. The create clause is similar syntax as within the CREATE desk assertion. This contains the identify of the column. The regulate model is equal to swap if the recent column has an identical identify because the previous. The COLUMN key-phrase is not obligatory and has no influence. MySQL will attempt its most sensible to accomplish an inexpensive conversion. less than no situation will MySQL quit and go back an errors whilst utilizing this assertion; a conversion of a few type will continuously be played. With this in brain, you want to make a backup of the information sooner than the conversion and instantly money the recent values to work out in the event that they are moderate. 38 | MySQL Pocket Reference DISABLE KEYS Tells MySQL to forestall updating indexes for MyISAM tables. This clause applies basically to nonunique indexes. simply because MySQL is extra effective at rebuilding its keys than it really is at development them separately, you might have considered trying to disable keys whereas acting bulk inserts right into a database. you'll want to steer clear of this trick, besides the fact that, when you've got learn operations going opposed to the desk whereas the inserts are operating. DISCARD TABLESPACE whilst utilizing InnoDB, it will delete the underlying . idb dossier while you're utilizing per-table tablespaces. be sure you again up the outdated . idb dossier prior to issuing this command. DROP [COLUMN] column Deletes a column from a desk. This assertion will get rid of a column and all its info from a desk completely. there's no strategy to recuperate information destroyed during this demeanour except from backups. All references to this column in indexes might be got rid of. Any indexes the place this used to be the only column may be destroyed to boot. (The COLUMN key-phrase is non-compulsory and has no impact. ) DROP basic KEY Drops the first key from the desk. DROP INDEX KEY gets rid of an index from a desk. This assertion will thoroughly erase an index from a desk. This assertion won't delete or regulate any of the desk info itself, basically the index info. as a result, an index got rid of during this demeanour might be recreated utilizing the adjust desk ... upload INDEX assertion. permit KEYS Recreates the indexes now not being up to date as a result of a previous name to DISABLE KEYS. IMPORT TABLESPACE helps you to import the information saved in an .