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High-Performance MySql evolution (I): Data type optimization _ bitsCN.com High-Performance MySql evolution (1): Data type optimization The database performance tuning process involves a lot of knowledge, including whether the attribute settings of

20145301 Two weeks study summary of learning Contents 3.1 types, variables, and operators Integer short 2 bytes, int 4 bytes, long 8 bytes Bytes byte 1 bytes Floating point float 4 bytes, double 8 bytes Character Char 2 bytes (including

Quick Check Table:char-128 ~ +127 (1 bytes)short-32767 ~ + 32768 (2 Bytes)unsigned short 0 ~ 65536 (2 Bytes)int-2147483648 ~ +2147483647 (4 Bytes)unsigned int 0 ~ 4294967295 (4 Bytes)Long = = IntLong long-9223372036854775808 ~ +9223372036854775807 (8

Calculate the geometric headache place generally lies in the code quantity and the accuracy question, the code quantity question as long as usual attention accumulates the template general to be not the problem. Accuracy problem is not good to say,

Quick Check Table:char-128 ~ +127 (1 bytes)short-32767 ~ + 32768 (2 Bytes)unsigned short 0 ~ 65535 (2 Bytes)int-2147483648 ~ +2147483647 (4 Bytes)unsigned int 0 ~ 4294967295 (4 Bytes)Long = = IntLong long-9223372036854775808 ~ +9223372036854775807 (8

chapter II Processing and representation of information2.1 Information Store1 . representation of three types of numbersunsigned: the encoding is based on the traditional binary notation, which represents a number greater than or equal to

First explain the packing and unpacking:Boxing is the automatic conversion of the base data type to the wrapper type; unpacking is the automatic conversion of the wrapper type to the base data type.The following table is the wrapper type for the

The visual format model of CSS is an algorithm that processes the document and displays it in a visual medium. It is the basic concept of CSS, the visual format model transforms each document element, and generates 0 or one or more boxes that

Quick Check Table:char-128 ~ +127 (1 bytes)short-32767 ~ + 32768 (2 Bytes)unsigned short 0 ~ 65535 (2 Bytes)int-2147483648 ~ +2147483647 (4 Bytes)unsigned int 0 ~ 4294967295 (4 Bytes)Long = = IntLong long-9223372036854775808 ~ +9223372036854775807 (8

Constants : Constants represent some fixed data, 0.0 is decimals, 0 is 0, floating-point type plus f;1.2f is single-precision floating point, 1.2 is double precision; The string is double-quoted, and the character is enclosed by single quotation

http://blog.csdn.net/hbuxiaofei/article/details/9491953When you look at the headline and still want to read it, it means that you're starting to focus on the data in memory storage issues.All right, here's a question to ask:struct stu{char sex;int

Refer to "C primmer Plus" First, the C language keyword: Type of data 14: void, char (1 bytes), int (4 bytes), Short (2 bytes), Long (4 bytes), Signed (4 bytes), unsigned (4 bytes), Float (4 bytes), double (8 bytes), struct, union, enum, typedef,

Chapter III data storage and input and output3.1 Representation of data in a computerA Memory: The hardware on your computer that stores data. The computer is composed of electronic components, in the computer power state, with 1 to indicate a pulse,

Problem: 　In Java, when the double number is too large, the string is turned out to be a representation of the scientific notation. Summarize:　　1. The project is stored with a mapping relationship between the type of Mysql,mysql and

Data type Constant Variable printf Function Introduction scanf function Introduction Operator Data typeThe data type is how the data is stored in memory.There are 5 Big data types in C: Basic type, constructed type, pointer

1, sometimes initialization needs to have the object with the initial value, then you can define another initialization method to use, such as:-(Xclass *) Initwith: (int) n {self = [super init];if (self) {[Self setfunction:n]; The Setfunction method

PHP mobile internet development notes (6)-MySQL database basic review [1]. I. data type 1. storage space of integer data types Description Value range: TINYINT1 integer with a very small byte signed value:-128 ~ 127 unsigned value: 0 ~ 1. smaller 255

Storage required for the Mysql field length column type TINYINT 1 byte SMALLINT 2 bytes MEDIUMINT 3 bytes INT 4 bytes INTEGER 4 bytes BIGINT 8 bytesFLOAT (X) 4 if X FLOAT 4 bytesDOUBLE 8 bytesDouble precision 8 bytesREAL 8 bytesDECIMAL (M, D)

this time to everyone to summarize the new characteristics of PHP7, the following is the actual case, together with the footsteps of small series to see. PHP7 new Features Scalar type declaration (requires that the parameter is a specific type,

Recently, I was studying python network programming. when I was writing a simple socket communication code, I encountered the use of the struct module. at that time, I was not quite clear about the role of this module, later, I checked the relevant