Data type

data type

types of data

• IP(v4):
  • varchar(15)
  • ex: 255.255.255.255
  • range/limit:
• IP range - Classless inter-domain routing (CIDR)
  • 12 or 24 bytes (IPv4 and IPv6 networks)
  • ex: 69.208.0.0/32

• Chinese name:
  • 最長姓名有13個字
• unix timestamp:
  • bigint(10) ;
  • ex: 1328664539
  • range/limit:

• School ID defined by MOE at Taiwan / 學校代碼
  • integer: 4(university) ~ 6
  • ex: 0001(國立政治大學)、373607(臺北市立華江國小)。前面可能有零。
  • range/limit:

• 經緯度 (經度,緯度):
  • DECIMAL(18,12) or FLOAT( 10, 6 )
  • ex: 37.401724,-122.114646
  • range/limit:

 (left blank intentionally)
* data
** data type
** ex:
** range/limit:

further reading

• MySQL :: MySQL 5.0 Reference Manual :: 10 Data Types
• Library of Free Data Models from DatabaseAnswers.org [Last visited: {{{date}}}]