255 characters

Numeric type tinyint      Storage Range: 128 to 127 or 0 to 255          tinyint (1) smallint     storage range: 32768 to 32767 or 0 to 65535   smallint (3) Mediumint     Storage Range:- 8388608 to 8388607 or 0 to 16777215   mediumint (5) int        

MySQL supports a large number of column types, which can be divided into 3 categories: numeric types, date and time types, and string (character) types. This section first gives an overview of the available types, summarizes the storage requirements

The role of the data type:1. Specifying the type of value2. Specify the space occupied3. Fixed length (fixed-length) or variable length (variable-length)4.mysql How to compare and sort the types of values5. Whether the defined type can be

Start by counting all the tables to seeNumber Type Column type The amount of storage needed TINYINT 1 bytes SMALLINT 2 bytes MEDIUMINT 3 bytes INT 4 bytes

Memcached distributed cache Quick Start and memcached Quick Start 1. From Single-host to distributedThe first step towards distribution is to solve the problem of sharing login information among multiple machines. • For example, there are three

The Comparison Between mysql and oracle table field definitions indicates that the length of mysql1_levarchar variable-length string VARCHAR [0-65535] is calculated by character length by default, for GBK-Encoded chinese characters, VARCHAR2 [1-4000]

MysqlSELECTThisnIsnFournlines; + -------------------- + ThisIsFourlines + ------------------ + note that the rule has changed since MySQL3.23.6. Now we introduce the referenced identifier (database, table, and column name) (If you run in ANSI mode,

General specifications of Microsoft Access databases General specifications of Microsoft Access database The size of the Microsoft Access database (. mdb) file is 2 GB. However, because the database can include chain tables in other files, its

Note: These are common Modem commands. Some commands may not apply to all modem instances. If any problem occurs, see the modem documentation or contact the modem manufacturer's Technical Support Department. All commands (with two exceptions) must

1. Common Types Other seller types MySQL type Bool, Tinyint (1) Boolean Tinyint (1) Char varying (M) Varchar (M) Dec Decimal Fixed Decimal Float4 Float

String operations in Delphi are very simple, but the background is quite complicated. The traditional string operation method of Pascal is different from that of Windows. Windows adopts the string operation method of C language. The 32-bit Delphi

1.1 key knowledge points 1. VB features, installation and startup Understand the object-oriented, visual, and event-driven features of VB. 2. VB integrated development environment Beginners can learn how to use the menu bar, toolbar, Toolbox window,

An index is a special file (an index on an InnoDB data table is an integral part of a tablespace) that contains reference pointers to all records in the data table. Note: [1]Indexing is not omnipotent! Indexing speeds up data retrieval, but slows

The data types and sizes in database storage vary. In some cases, only the numeric type is stored, and some only the text type is stored. Many databases support various specialized types: Date and Time, binary character, and Boolean. Matching data

We need to debug the PL/SQL process to view the variable content. You can use the following method. Assume that the variable we want to view is output and the type is varchar2. 1. The most basic DBMS_OUTPUT.PUT_LINE () method.You can use DBMS_OUTPUT.

Ing between MySQL and Oracle Data Types (table form), mysqloracle MySQL and Oracle databases are usually used at work. Because of some differences in data types between MySQL and Oracle, the following describes the relationship between the data

MySQL self-study (III) and mysql self-study MySQL Data Type MySQL supports multiple data types, including numeric, date, and string.Value Type MySQL mainly provides INTEGER types: TINYINT/SMALLINT/MEDIUMINT/INT (INTEGER)/BIGINT You can add the

The length of parameters in the java address bar is limited. When exporting data in today's project, if the data volume is small, there is no problem. If you export 500 data records at a time, an error is returned. The error message is that the

Text and image are 16 bytes in length and cannot be changed. during storage, the content is stored on the hard disk. The content address and content size are recorded in the table. Therefore, image and text cannot be indexed. Field Type Different

Sometimes I was looking for access performance problems, but I couldn't find them with the help of MS Office. I accidentally found this article and shared it with netizens. // ================================================ =========================