sql field types

In the reconstruction of the site, the data structure is usually modified, so add, delete, add the MySQL table field is unavoidable, and sometimes for convenience, but also increase the modification of the table or field comments, the same field

In the reconstruction of the site, the data structure is usually modified, so add, delete, add the MySQL table field is unavoidable, and sometimes for convenience, but also increase the modification of the table or field comments, the same field

I. Commonly Used MySQL command line commands1. Start the MySQL service. Net start MySQL Stop MySQL service. net stop MySQL 2. netstat-Na | findstr 3306: Check the listening port. findstr is used to check whether the following port exists. 3. log on

Description of SQL Server Field Types The following describes the Field Types of SQL Server 7.0 and later versions. For more information about the field types of SQL Server 6.5, see the description provided by SQL Server. Bit: an integer of 0 or

Create a blank table: sql= "CREATE table [table name]"Create a table with fields: sql= "CREATE table [table name] ([field name 1] Memo not NULL, [field Name 2] Memo, [Field name 3] COUNTER not NULL, [field name 4] DATETIME, [field name 5] TEXT (200),

Text nvarchar (N) Note ntext Number (long integer) int Integer smallint Number (single precision) Real Number (Double Precision) float Number (byte) tinyint Currency Money Date smalldatetime Boolean Appendix: the script for converting to SQL. Alter

How to Learn the data types and table field constraint types supported by MySQL, MySQL Data (field) TypeWhen creating a table, you must clearly define the data type corresponding to the field. MySQL data types include numeric, string (text), time

SQL obtains all user names, database names, all table names, all field names, and field types. 2009 - 03 - 14 10 : 48 1 . Get all user names: Select Name From Sysusers Where Status = ' 2 ' And Islogin = ' 1 ' Islogin = ' 1 '

Basis:The difference between char, varchar, text, and nchar, nvarchar, ntext1, CHAR. Char is convenient to store the fixed-length data, the index on the Char field is more efficient, such as the definition of char (10), then regardless of whether

MySQL data (field) typewhen you create a table, you explicitly define the data type of the field. MySQL's main data types are numeric, string (text), date, and other types.Numeric typeNumeric type description: Supplementary notesIn the Int