Home >Database >Mysql Tutorial >数据库中MySQL各种字段的取值范围_MySQL

数据库中MySQL各种字段的取值范围_MySQL

WBOY
WBOYOriginal
2016-06-01 14:11:461202browse

  TINYINT
  
  -128 - 127
  
  TINYINT UNSIGNED
  
  0 - 255
  
  SMALLINT
  
  -32768 - 32767
  
  SMALLINT UNSIGNED
  
  0 - 65535
  
  MEDIUMINT
  
  -8388608 - 8388607
  
  MEDIUMINT UNSIGNED
  
  0 - 16777215
  
  INT 或 INTEGER
  
  -2147483648 - 2147483647
  
  INT UNSIGNED 或 INTEGER UNSIGNED
  
  0 - 4294967295
  
  BIGINT
  
  -9223372036854775808 - 9223372036854775807
  
  BIGINT UNSIGNED
  
  0 - 18446744073709551615
  
  FLOAT
  
  -3.402823466E+38 - -1.175494351E-38
  
  0
  
  1.175494351E-38 - 3.402823466E+38
  
  DOUBLE 或 DOUBLE PRECISION 或 REAL
  
  -1.7976931348623157E+308 - -2.2250738585072014E-308
  
  0
  
  2.2250738585072014E-308 - 1.7976931348623157E+308
  
  DECIMAL[(M,[D])] 或 NUMERIC(M,D)
  
  由M(整个数字的长度,包括小数点,小数点左边的位数,小数点右边的位数,但不包括负号)和D(小数点右边的位数)来决定,M缺省为10,D缺省为0
  
  DATE
  
  1000-01-01 - 9999-12-31
  
  DATETIME
  
  1000-01-01 00:00:00 - 9999-12-31 23:59:59
  
  TIMESTAMP
  
  1970-01-01 00:00:00 - 2037年的某天(具体是哪天我也不知道,呵呵)
  
  TIME
  
  -838:59:59' to 838:59:59
  
  YEAR[(2|4)]
  
  缺省为4位格式,4位格式取值范围为1901 - 2155,0000,2位格式取值范围为70-69(1970-2069)
  
  CHAR(M) [BINARY] 或 NCHAR(M) [BINARY]
  
  M的范围为1 - 255,如果没有BINARY项,则不分大小写,NCHAR表示使用缺省的字符集.在数据库中以空格补足,但在取出来时末尾的空格将自动去掉.
  
  [NATIONAL] VARCHAR(M) [BINARY]
  
  M的范围为1 - 255.在数据库中末尾的空格将自动去掉.
  
  TINYBLOB 或 TINYTEXT
  
  255(2^8-1)个字符
  
  BLOB 或 TEXT
  
  65535(2^16-1)个字符
  
  MEDIUMBLOB 或 MEDIUMTEXT
  
  16777215 (2^24-1)个字符
  
  LONGBLOB 或 LONGTEXT
  
  4294967295 (2^32-1)个字符
  
  ENUM('value1','value2',...)
  
  可以总共有65535个不同的值
  
  SET('value1','value2',...)
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn