ansi sql data types

In the database class, I started with SQL and talked about create table and constraints. I gave them a question on the tiger bar, it is a puzzle found from the famous SQL Puzzles and Answers. The Answers in the original book are actually incorrect. Create a new table that contains three columns, all of which are varchar2 (5) data

The date and time data from January 1, January 1-20, 1900 to January 1, June 6 are accurate to minutes.String Char A fixed length of non-Unicode characters. The maximum length is 8,000 characters. Varchar Variable-length non-Unicode data, which can contain a maximum of 8,000 characters. Text Variable-length non-Unicode data. The maximum length is 2 ^ 31-1 (2,147

("abc ").Varchar is slightly less efficient than char because, when modifying varchar data, data migration (that is, redundant I/O) may be caused by different data lengths ). Oracle expresses this redundant I/O description as "Row Migration ).View instancesChar and varchar of SQL SERVER 2000 in this Tes

User-defined data types:Using system stored procedure sp_addtype to create user-defined data types, T-SQL statements create user-defined data type syntax in the following form:Sp_addtype @typename =type @phystype = ' System_data_type ', @nulltype = ' Nulltype ', @owner = ' o

========================================================== ======================== /* Create a rule named list. This rule indicates that the variable can only take values 0 and 1 */ Create rule list As @ Col in (0, 1) Go /* Create a custom data type, which is a child type of the int type */Exec sp_addtype intswitch, "int", "not null"/* Bind the rule list to the custom type intswitch */Exec sp_bindrule list, intswitchGo /* Create a table named m

Common Data Types in SQL Server: BinaryA fixed-length binary data with a maximum length of 8,000 bytes. VarbinaryA variable-length binary data with a maximum length of 8,000 bytes. ImageA variable-length binary data with a ma

Common Data Types in SQL server:BinaryA fixed-length binary data with a maximum length of 8,000 bytes.VarbinaryA variable-length binary data with a maximum length of 8,000 bytes.ImageA variable-length binary data with a maximum le

Tags: ima timestamp mon XML Hiera blog AC Div class SQL Server data Types Oracle data Types bigint Number (19,0) Binary (1-2000) RAW (1-2000) Binary (2001-8000) Blob Bit

order, for example, order by id desc (or ASC). There are two types of order: DESC Reverse Order (100-1, that is, from the latest number Query data later), ASC (from 1-100) The where and order statements can also be used to query select and delete statements. 11. Delete the information in the table: Delete the information in the entire table: delete from table_name; Statement for deleting the specified cond

A field in a MySQL data table must have a data type defined. There are about 25 options, most of which are straightforward and not much of a waste of breath. But there are a few that need to be mentioned. TEXT TEXT is not a data type, although it may be said in some books. It should actually be "LONG VARCHAR" or "Mediumtext". DATE The format of the DATE

SQL statement used to query fields of all INFORMIX data tables: Select a. tabname, B. colname, B. coltype,Case B. coltypeWhen '0' then 'Char'When '1' then 'smallint'When '2' then' integer'When '3' then 'float'When '4' then 'smallfloat'When '5' then 'decimal'When '6' then 'serial'When '7' then 'date'When '8' then 'money'When '9' then 'null'When '10' then 'datetime'When '11' then 'byte'When '12' then 'text'Wh

The MySQL data table fields must have a data type defined. There are about 25 options, most of which are straightforward, and it's not much of a waste of breath. But there are a few that need to be mentioned. TEXT is not a data type, although it may be said in some books. It should actually be "LONG VARCHAR" or "Mediumtext". The format of the date