mysql基本数据类型

大数据类型

CREATE TABLE DATA(fti TINYINT,fsi SMALLINT,

fmi MEDIUMINT,fi INT,fbi BIGINT);

int类型

CREATE TABLE data1(age INT(7));

float类型

CREATE TABLE data2(price FLOAT(5,2));

INSERT INTO data2 VALUES(13.1),(14.567);

查询结果：保留小数点后两位

SELECT * FROM data2;

char类型

CREATE TABLE data3(sname CHAR(10));

INSERT INTO data3VALUES(‘wers‘),(‘ertdsasdfggh‘);

SELECT * FROM data3;

不够空格补齐，多余自动截取

时间类型：

CREATE TABLE data4(birthday DATE);

INSERT INTO data4 VALUES(‘2015-03-05‘),(20150506);

SELECT * FROM data4;

enum类型

CREATE TABLE data5 (gender ENUM(‘M‘,‘F‘));

INSERT INTO data5VALUES(‘M‘),(‘m‘),(‘f‘),(‘yy‘),(NULL);

SELECT * FROM data5;

SELECT COUNT(*) FROM data5 WHEREgender=‘M‘;

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