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MySQL笔记(2)
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2主键
主键 (PRIMARY KEY)是用于约束表中的一行,作为这一行的唯一标识符,在一张表中通过主键就能准确定位到一行,因此主键十分重要。主键不能有重复且不能为空。
1 Id int(10)primary key 2 constraint <主键名> primary key (主键) eg constraint <app_pk> primary key (name) 3 constraint <主键名> primary key (主键,主键) eg constraint <app_pk> primary key (id,name) 4 复合主键。主键不仅可以是表中的一列,也可以由表中的两列或多列来共同标识
3 默认值约束
默认值约束 (DEFAULT) 规定,当有 DEFAULT 约束的列,插入数据为空时,将使用默认值。
1 people_num int(10) default ‘10‘, people_num有DEFAULT约束,默认值为10
DEFAULT 约束只会在使用 INSERT 语句时体现出来,INSERT语句中,如果被 DEFAULT 约束的位置没有值,那么这个位置将会被 DEFAULT 的值填充,如语句:
1 # 正常插入数据 2 INSERT INTO department(dpt_name,people_num) VALUES(‘dpt1‘,11); 3 4 #插入新的数据,people_num 为空,使用默认值 5 INSERT INTO department(dpt_name) VALUES(‘dpt2‘);
4 唯一约束
唯一约束 (UNIQUE) 比较简单,它规定一张表中指定的一列的值必须不能有重复值,即这一列每个值都是唯一的。
1 unique (phone), unique约束,phone的值唯一
当 INSERT 语句新插入的数据和已有数据重复的时候,如果有 UNIQUE约束,则 INSERT 失败,比如:
1 INSERT INTO people VALUES(01,110110); 2 INSERT INTO people VALUES(02,110110,);
5 外键约束
外键 (FOREIGN KEY) 既能确保数据完整性,也能表现表之间的关系。
一个表可以有多个外键,每个外键必须 REFERENCES (参考) 另一个表的主键,被外键约束的列,取值必须在它参考的列中有对应值。
<img alt="技术分享" 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 本文系统来源:http://www.cnblogs.com/ljmzzyk/p/7440211.html
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