db2 varchar max length

' VARCHAR (128) DEFAULT ',' First_path ' VARCHAR (256) DEFAULT ',' dir ' VARCHAR (255) DEFAULT ',' A ' text,PRIMARY KEY (' id '),KEY ' First_path ' (' First_path ' (255)),KEY ' dir ' (' dir '),KEY ' A ' (' a ' (255))) Engine=innodb DEFAULT Charset=utf8 |So key inside a (255) represents 255 characters (one UTF8 character for 3 bytes). Look at the Federated index

varchar (n), n in nvarchar (n) how to interpret:nvarchar (n) can store up to n characters without distinguishing between Chinese and English.　　varchar (n) can store up to n bytes , and one Chinese is two bytes.Occupied space:nvarchar (n) is a character that takes up two bytes of space.varchar (n) Chinese accounts for two bytes of space in English.Value range of N:The range of nvarchar (n) n is: between 1 an

When indexing, the database calculates that the length of the key is incremented by the char length of all the fields that are used by index and then multiplied by the following scale to not exceed the specified key length of 1000:Latin1 = 1 byte = 1 characterUft8 = 3 byte = 1 characterGBK = 2 byte = 1 characterFor example, to see more clearly, take GBK as an exa

Tags: design img Create scale var max null arch characterToday design table structure, add a few fields, the results of the errorThe situation was that there would have been 50 fields in the table, and this time the need to add 18 fields, I set all 18 fields to Vachar 255. The result was an error. I don't understand why.This mistake with Baidu translated out is "the line is too big." The largest line in the scale. Except blobs,65535. ”What the hell is

Label:Error executing nova-manage DB sync: 2012-03-24 14:07:01 CRITICAL Nova [-] (Operationalerror) (1071, ' Specified key was too long; Max key length is $ bytes ' ) ' \ncreate TABLE user_project_association (\n\tcreated_at datetime, \n\tupdated_at datetime, \n\tdeleted_at datetime, \ n\tdeleted BOOL, \n\tuser_id varchar (255) NOT NULL, \n\tproject_id

Issue create Table:specified Key was too long;Max key length is 767 bytes reason database table is UTF8 encoded, where varchar (255) column has a unique key index and MySQL by default the index of a single column cannot exceed 767 bits (different versions may differ)So UTF8 character encoding, 255*3 byte exceeds the limit resolution 1 using INNODB engine, 2 enabl

): column length too big for Column ' flist ' (max = 21845); Use BLOB or TEXT insteadFrom the above error we know that the Flist column specified value cannot be greater than 21845 bytes (as defined in the official MySQL manual, the field length for creating a table is limited to 65535 bytes, which refers to the length

One point of note is that when SQLAlchemy uses Create_all () to build a table, import the model of those tables on the page where the Create_all () is located.　　Sqlalchemy.exc.OperationalError: (_mysql_exceptions. Operationalerror) (1074, "column length too big for Column ' err_solution ' (max = 21845); Use BLOB or TEXT instead ") [sql:u ' \ncreate TABLE amazon_errcode (\n\tcreate_date datetime, \n\tmodifie

During the design of MySQL database fields today, the prompt is always prompted during table creation.MySQL:Error 1071 (42000): specified key was too long; max key length is 767 bytes.At first, I didn't figure out why, because by default, MySQL restricts the length of the varchar type to between 0 and 65535. Later, I c