Data Type Smallint

Either in the pitiful free database space or large e-commerce sites, reasonable design table structure, make full use of space is very necessary. This requires that we have a full understanding of the commonly used MySQL data types for database systems. Now I will write down my little experience to share with you. The numeric type of the MySQL data type The numeric type is divided into three categories according to my classification: integer classes, decimal classes, and numeric classes. My so-called "digital class" refers to DECIMAL and NUMERIC, which are the same type. It is strictly speaking not ...

DEDECMS database Structure table name: Dede_feedback field description is as follows: Table name: Dede_feedback (ENGINE=MYISAM/CHARSET=GBK) Description: Comment 6184.html "> Data table field name description Specific parameter userhttp://www.aliyun.com/zixun/aggregation/11696.html ">name username ...

Designing 1 applications doesn't seem to be difficult, but it's not easy to achieve the optimal performance of the system. There are many choices in development tools, database design, application structure, query design, interface selection, and so on, depending on the specific application requirements and the skills of the development team. This article takes SQL Server as an example, discusses the application performance optimization techniques from the perspective of the background database, and gives some useful suggestions. 1 database design to achieve optimal performance in a good SQL Server scenario, the key is to have 1 ...

Hive data type 1. Basic type Integer type: Tinyint,smallint,int,bigint, the above types correspond to the Byte,short,int,long in Java respectively. Decimal Type: Float,double Boolean type: Boolean string type: String,varchar,char 2. Complex Type Array,map,struct,timestamp (DATE) Common ...

The database holds one or more tables. Create a Database The CREATE DATABASE statement is used to create a database in MySQL. Syntax CREATE DATABASE database_name In order for PHP to execute the above statement, we must use the mysql_query () function. This function is used to send queries or commands to the MySQL connection. Example In the following example, we create a database named "my_db": ...

DEDECMS database Structure table name: Dede_erradd field description is as follows: Table name: Dede_erradd (ENGINE=MYISAM/CHARSET=GBK) Description: Wrong 6184.html "> Data table field name description describes specific parameters Errtxt error message Mediumtext, title title char not NULL DEFAULT ', aid document ID me ...