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Home » Technical Support » DBISAM Technical Support » Product Manuals » DBISAM Version 4 Manual for RAD Studio XE (Delphi) » SQL Reference » ALTER TABLE Statement |
ALTER TABLE [IF EXISTS] table_reference [[ADD [COLUMN] [IF NOT EXISTS] column_name data type [dimensions] [AT column_position] [DESCRIPTION column description] [NULLABLE][NOT NULL] [DEFAULT default value] [MIN or MINIMUM minimum value] [MAX or MAXIMUM maximum value] [CHARCASE UPPER | LOWER | NOCHANGE] [COMPRESS 0..9]] | [REDEFINE [COLUMN] [IF EXISTS] column_name [new_column_name] data type [dimensions] [AT column_position] [DESCRIPTION column description] [NULLABLE][NOT NULL] [DEFAULT default value] [MIN or MINIMUM minimum value] [MAX or MAXIMUM maximum value] [CHARCASE UPPER | LOWER | NOCHANGE] [COMPRESS 0..9]] | [DROP [COLUMN] [IF EXISTS] column_name]] [, ADD [COLUMN] column_name REDEFINE [COLUMN] column_name DROP [COLUMN] column_name...] [, ADD [CONSTRAINT constraint_name] [UNIQUE] [NOCASE] PRIMARY KEY (column_name [ASC or ASCENDING | DESC or DESCENDING] [, column_name...]) [COMPRESS DUPBYTE | TRAILBYTE | FULL | NONE]] [NOKEYSTATS] [, REDEFINE [CONSTRAINT constraint_name] [UNIQUE] [NOCASE] PRIMARY KEY (column_name [ASC or ASCENDING | DESC or DESCENDING] [, column_name...]) [COMPRESS DUPBYTE | TRAILBYTE | FULL | NONE]] [NOKEYSTATS] [, DROP [CONSTRAINT constraint_name] PRIMARY KEY] [TEXT INDEX (column_name, [column_name])] [STOP WORDS space-separated list of words] [SPACE CHARS list of characters] [INCLUDE CHARS list of characters] [DESCRIPTION table_description] [INDEX PAGE SIZE index_page_size] [BLOB BLOCK SIZE BLOB_block_size] [LOCALE locale_name | LOCALE CODE locale_code] [ENCRYPTED WITH password] [USER MAJOR VERSION user-defined_major_version] [USER MINOR VERSION user-defined_minor_version] [LAST AUTOINC last_autoinc_value] [NOBACKUP]
ALTER TABLE Names DROP FullName, ADD IF NOT EXISTS LastName CHAR(25)
ALTER TABLE Names REDEFINE LastName CHAR(30)
ALTER TABLE Customer TEXT INDEX ()
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