我的MYSQL学习心得（四）

MYSQL里的BLOB数据类型

BLOB是一个二进制大对象，用来存储可变数量的数据。BLOB类型分为4种：TinyBlob、Blob、MediumBlob、LongBlob，

这几个类型之间的唯一区别是在存储文件的最大大小上不同。

MySQL的四种BLOB类型类型大小(单位：字节)

TinyBlob 最大 255
Blob 最大 65K
MediumBlob 最大 16M
LongBlob 最大 4G

BLOB列存储的是二进制字符串（字节字符串）；TEXT列存储的是非二进制字符串（字符字符串）。

BLOB列没有字符集，并且排序和比较基于列值字节的数值；TEXT列有一个字符集，并且根据字符集对值进行排序和比较

SQLSERVER

SQLSERVER并没有BLOB数据类型，只有大型对象数据类型（BLOB）：

text,ntext,image,nvarchar(max),varchar(max),varbinary(max)和xml数据类型

这些数据类型的数据都存放在LOB类型的数据页面里

如有不对的地方，欢迎大家拍砖o(∩_∩)o

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