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資料表欄位設計時,針對不同資料類型,建議的資料型態(data type) | 資料表欄位設計時,針對不同資料類型,建議的資料型態(data type) | ||
== examples of data and suggested datatype == | == examples of data and suggested datatype == | ||
=== birth year === | === birth year === | ||
* data type: int | * data type: int | ||
* | * example: Range from 1905 ~ 2013 (108 yeas old) from the Sing-up form from outlook.com {{access| date=2013-02-04}} | ||
* range/limit: 122 yeas old<ref>[http://zh.wikipedia.org/wiki/%E6%9C%80%E5%B9%B4%E9%95%B7%E8%80%85 最年長者 - 維基百科,自由的百科全書]: | * range/limit: 122 yeas old<ref>[http://zh.wikipedia.org/wiki/%E6%9C%80%E5%B9%B4%E9%95%B7%E8%80%85 最年長者 - 維基百科,自由的百科全書]: 「根據金氏世界紀錄大全紀錄的最長壽者是活了122年的雅娜·卡爾曼特」、[https://zh.wikipedia.org/zh-tw/%E5%90%84%E5%9B%BD%E4%BA%BA%E5%8F%A3%E9%A2%84%E6%9C%9F%E5%AF%BF%E5%91%BD%E5%88%97%E8%A1%A8 各國人口預期壽命列表</ref> | ||
=== file name === | === file name === | ||
Line 35: | Line 33: | ||
=== Chinese name === | === Chinese name === | ||
* 最長姓名有13個字 <ref> 中國新聞網 (2010). [http://dailynews.sina.com/bg/tw/twpolitics/chinanews/20101104/00481967448.html 台灣“獨一姓氏”者達149人 最長姓名有13個字_台灣頻道_新浪網-北美]</ref><ref>[http://news.ltn.com.tw/news/life/paper/780935 姓名8個字 外交部不給護照 - 生活 - 自由時報電子報]</ref> | |||
* | * 參考別人: LINE姓名欄位長度限制: 15字(15個中文字或15英文字母) | ||
=== unix timestamp === | === unix timestamp === | ||
Line 42: | Line 40: | ||
* ex: 1328664539 | * ex: 1328664539 | ||
* range/limit: | * range/limit: | ||
=== duration 時長 === | |||
* data type: {{kbd | key= TIME}} 「{{kbd | key= TIME}} values may range from '-838:59:59' to '838:59:59'」<ref>[http://dev.mysql.com/doc/refman/5.0/en/time.html MySQL :: MySQL 5.0 Reference Manual :: 11.3.2 The TIME Type]</ref> | |||
* format: 小時:分鐘:秒 hh:mm:ss | |||
* 參考別人: Google form 問卷題目選項的小時 0~72 ; 分鐘: 00~59: 秒: 00~59 | |||
=== 學校代碼 === | === 學校代碼 === | ||
Line 48: | Line 51: | ||
* ex: 0001(國立政治大學)、373607(臺北市立華江國小)。前面可能有零。 | * 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: | * range/limit: | ||
=== 地址 === | |||
* 資料類型: {{kbd | key=TEXT}} or {{kbd | key=VARCHAR(255)}}<ref>[https://stackoverflow.com/questions/354763/common-mysql-fields-and-their-appropriate-data-types address]</ref> | |||
* 參考別人: 觀察 Google payment 付款地址的文字輸入框並沒有限制文字長度 | |||
=== 經緯度 (經度,緯度) === | === 經緯度 (經度,緯度) === | ||
* DECIMAL(18,12)<ref>[http://stackoverflow.com/questions/159255/what-is-the-ideal-data-type-for-latitude-longitude mysql - What is the ideal data type for latitude / longitude? - Stack Overflow]</ref> or FLOAT( 10, 6 )<ref>[http://code.google.com/apis/maps/articles/phpsqlsearch.html Creating a Store Locator with PHP, MySQL & Google Maps - Google Maps API Family - Google Code]</ref> | * DECIMAL(18,12)<ref>[http://stackoverflow.com/questions/159255/what-is-the-ideal-data-type-for-latitude-longitude mysql - What is the ideal data type for latitude / longitude? - Stack Overflow]</ref> or FLOAT( 10, 6 )<ref>[http://code.google.com/apis/maps/articles/phpsqlsearch.html Creating a Store Locator with PHP, MySQL & Google Maps - Google Maps API Family - Google Code]</ref> or VARCHAR( 30 ) | ||
* ex: 37.401724,-122.114646 | * ex: 37.401724,-122.114646 | ||
* range/limit: | * range/limit: | ||
=== 價錢/金額 === | === 價錢/金額 === | ||
* DECIMAL(10,2)<ref> [http://stackoverflow.com/questions/628637/best-data-type-for-currency sql - Best Data Type for Currency - Stack Overflow]{{access | date=2012-03-07}} </ref> | * DECIMAL(10,2)<ref> [http://stackoverflow.com/questions/628637/best-data-type-for-currency sql - Best Data Type for Currency - Stack Overflow]{{access | date=2012-03-07}} </ref><ref>[http://zhidao.baidu.com/question/682060470049185972.html mysql 用什么数据类型表示价格?_百度知道]{{access | date=2015-05-25}} </ref> | ||
* ex: | * ex: | ||
* range/limit: 0.00 ~ 99999999.99 | * range/limit: 0.00 ~ 99999999.99 | ||
Line 69: | Line 76: | ||
=== 密碼 === | === 密碼 === | ||
* varchar at least eight (8) characters<ref>[https://www.owasp.org/index.php/Password_length_%26_complexity Password length & complexity - OWASP] "Minimum length. Passwords should be at least eight (8) characters long." </ref> | * varchar at least eight (8) characters<ref>[https://www.owasp.org/index.php/Password_length_%26_complexity Password length & complexity - OWASP] "Minimum length. Passwords should be at least eight (8) characters long." </ref> | ||
=== 雜湊碼 (hash value) === | |||
* [https://zh.wikipedia.org/wiki/MD5 MD5]: CHAR(32)<ref>[https://stackoverflow.com/questions/14922208/can-i-use-varchar32-for-md5-values php - Can I use VARCHAR(32) for md5() values? - Stack Overflow]</ref> | |||
* [https://zh.wikipedia.org/wiki/SHA%E5%AE%B6%E6%97%8F SHA] 256<ref>[https://stackoverflow.com/questions/2240973/how-long-is-the-sha256-hash mysql - How long is the SHA256 hash? - Stack Overflow]</ref><ref>[http://fishjerky.blogspot.com/2013/06/md5sha512.html 魚乾的筆記本: MD5被破解了,要改用SHA]</ref>: | |||
** (1) HEX: CHAR(64) Using [http://php.net/manual/en/function.hash-file.php PHP: hash_file()], MySQL [https://dev.mysql.com/doc/refman/5.6/en/encryption-functions.html#function_sha2 SHA2(str, hash_length)] | |||
** (2) Binary: BINARY(32) In PHP using [http://php.net/manual/en/function.hex2bin.php hex2bin()] e.g. {{kbd | key=<nowiki>echo hex2bin(hash_file('sha256', $file_path));</nowiki>}}, In MySQL using [https://www.w3resource.com/mysql/string-functions/mysql-unhex-function.php UNHEX() function] e.g. {{kbd | key=<nowiki>SELECT UNHEX(SHA2('The quick brown fox jumped over the lazy dog.', 256))</nowiki>}} | |||
==== Retrieve the hash value from string or file content ==== | |||
PHP: | |||
<pre> | |||
<?php | |||
/* Create a file to calculate hash of */ | |||
file_put_contents('example.txt', 'The quick brown fox jumped over the lazy dog.'); | |||
echo hash_file('sha256', 'example.txt'); | |||
// expected result: 68b1282b91de2c054c36629cb8dd447f12f096d3e3c587978dc2248444633483 | |||
// 64 characters | |||
// calculate the hash of string | |||
echo hash('sha256', 'The quick brown fox jumped over the lazy dog.'); | |||
?> | |||
</pre> | |||
MySQL: | |||
<pre> | |||
SELECT SHA2('The quick brown fox jumped over the lazy dog.', 256) | |||
</pre> | |||
==== Retrieve the hash value from binary value ==== | |||
* PHP: [http://php.net/manual/en/function.bin2hex.php bin2hex()] e.g. {{kbd | key=<nowiki>echo bin2hex(hex2bin(hash('sha256', 'The quick brown fox jumped over the lazy dog.')));</nowiki>}} | |||
* MySQL: [https://dev.mysql.com/doc/refman/8.0/en/hexadecimal-literals.html Hexadecimal Literals] e.g. {{kbd | key=<nowiki>SELECT HEX(UNHEX(SHA2('The quick brown fox jumped over the lazy dog.', 256)));</nowiki>}}<ref>[https://stackoverflow.com/questions/14608413/storing-a-binary-sha1-hash-into-a-mysql-binary20-column insert - Storing a binary SHA1 hash into a mySQL BINARY(20) column - Stack Overflow]</ref> | |||
=== membership === | === membership === | ||
* [http://msdn.microsoft.com/en-us/library/aa478949.aspx Membership Providers] | |||
=== 台灣公司統一編號 === | |||
* 八位數字 因為可能以 0 開頭,所以建議使用 {{kbd | key= VARCHAR(8)}},而不建議使用 {{kbd | key= INT(8)}} <ref>[https://www.etax.nat.gov.tw/etwmain/web/ETW113W1_1 公示資料查詢服務-財政部稅務入口網]</ref><ref>[http://herolin.webhop.me/entry/is-valid-TW-company-ID/ » 營利事業統一編號驗證完全手冊(Javascript,Java,C#,PHP) - Hero Think~用手摀住我的嘴]</ref> | |||
=== 商品序號或商品條碼 === | |||
MySQL: {{kbd | key = VARCHAR(14)}} | |||
* GTIN 全球交易品項號碼([http://en.wikipedia.org/wiki/Global_Trade_Item_Number Global Trade Item Number]) 最長 14 位數 | |||
* EAN 國際商品條碼([http://en.wikipedia.org/wiki/International_Article_Number_(EAN) International Article Number]),即前[http://zh.wikipedia.org/wiki/%E6%AC%A7%E6%B4%B2%E5%95%86%E5%93%81%E7%BC%96%E7%A0%81 歐洲商品條碼] (European Article Number) and [http://en.wikipedia.org/wiki/International_Article_Number_(EAN)#jan Japanese Article Number (JAN)] 最長 13 位數 | |||
* UPC [http://zh.wikipedia.org/wiki/%E9%80%9A%E7%94%A8%E4%BA%A7%E5%93%81%E4%BB%A3%E7%A0%81 通用產品代碼] ([http://en.wikipedia.org/wiki/Universal_Product_Code Universal Product Code]) 最長 12 位數,只允許數字 (UPC-A) | |||
* ASIN [http://zh.wikipedia.org/wiki/%E4%BA%9A%E9%A9%AC%E9%80%8A%E6%A0%87%E5%87%86%E8%AF%86%E5%88%AB%E5%8F%B7%E7%A0%81 亞馬遜標準識別號碼] (Amazon Standard Identification Number) 由十個字元(字母或數字)組成 | |||
書籍 | |||
* ISBN [http://zh.wikipedia.org/wiki/%E5%9B%BD%E9%99%85%E6%A0%87%E5%87%86%E4%B9%A6%E5%8F%B7 國際標準書號]([http://en.wikipedia.org/wiki/International_Standard_Book_Number International Standard Book Number]) 最長 13 位數 | |||
=== 國際電話號碼 === | |||
[https://medium.com/frochu/libphonenumber-example-app-f60680faa599 使用 Google libphonenumber 套件驗證國際電話號碼格式 – Frochu – Medium] | |||
=== 很長的文字 === | === 很長的文字 === | ||
* MySQL: {{kbd | key = TEXT}}<ref>[http://blog.longwin.com.tw/2009/10/mysql-text-field-type-length-limit-2009/ MySQL TEXT 格式 的 長度限制 - Tsung's Blog | * MySQL: {{kbd | key= LONGTEXT}}: 4GB / {{kbd | key = TEXT}}: 65,535 bytes ~64kb <ref>[http://dev.mysql.com/doc/refman/5.7/en/string-type-overview.html MySQL :: MySQL 5.7 Reference Manual :: 11.1.3 String Type Overview]</ref><ref>[http://blog.longwin.com.tw/2009/10/mysql-text-field-type-length-limit-2009/ MySQL TEXT 格式 的 長度限制 - Tsung's Blog]</ref> | ||
* MsSQL: {{kbd | key = NVARCHAR(max)}}<ref>[http://technet.microsoft.com/en-us/library/ms186939.aspx nchar and nvarchar (Transact-SQL)]</ref> | * MsSQL: {{kbd | key = NVARCHAR(max)}}: 2GB <ref>[http://technet.microsoft.com/en-us/library/ms186939.aspx nchar and nvarchar (Transact-SQL)]</ref> | ||
<pre> (left blank intentionally) | <pre> (left blank intentionally) | ||
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== comparision of datatypes in different database server == | == comparision of datatypes in different database server == | ||
=== numeric === | |||
{{kbd | key=bigint}} | |||
* MS SQL<ref>[https://msdn.microsoft.com/zh-tw/library/ms187745(v=sql.120).aspx int、bigint、smallint 和 tinyint (Transact-SQL)]</ref> & MySQL<ref>[https://dev.mysql.com/doc/refman/5.5/en/integer-types.html MySQL :: MySQL 5.5 Reference Manual :: 11.2.1 Integer Types (Exact Value) - INTEGER, INT, SMALLINT, TINYINT, MEDIUMINT, BIGINT]</ref> are equivalent | |||
=== text === | |||
Storing Unicode text<ref> | Storing Unicode text<ref> | ||
* [http://trufflepenne.blogspot.tw/2012/10/mysql-sqlservernvarchar.html 松露筆管麵: Mysql 等同SqlServer的nvarchar] | * [http://trufflepenne.blogspot.tw/2012/10/mysql-sqlservernvarchar.html 松露筆管麵: Mysql 等同SqlServer的nvarchar] | ||
* [http://stackoverflow.com/questions/144283/what-is-the-difference-between-varchar-and-nvarchar sql server - What is the difference between varchar and nvarchar? - Stack Overflow]</ref> | * [http://stackoverflow.com/questions/144283/what-is-the-difference-between-varchar-and-nvarchar sql server - What is the difference between varchar and nvarchar? - Stack Overflow]</ref> | ||
* MySQL: {{kbd | key=varchar}} | * MySQL: {{kbd | key=varchar}} / MS SQL 2008: {{kbd | key=nvarchar}} | ||
* MS SQL 2008: {{kbd | key=nvarchar}} | * MySQL: {{kbd | key= LONGTEXT}} (4GB)<ref>[http://dba.stackexchange.com/questions/98268/whats-sql-server-nvarcharmax-equivalent-in-mysql Whats SQL Server NVARCHAR(max) equivalent in MySQL? - Database Administrators Stack Exchange]</ref> / MS SQL 2008: {{kbd | key=nvarchar(max)}} (2GB)<ref>[https://msdn.microsoft.com/zh-tw/library/ms186939(v=sql.120).aspx nchar 和 nvarchar (Transact-SQL)]</ref> | ||
=== date and time === | |||
{{kbd | key=DATETIME}}: ex: "2013-06-13 03:33:33" | {{kbd | key=DATETIME}}: ex: "2013-06-13 03:33:33" | ||
* MS SQL 2008 | * MS SQL 2008 & MySQL are equivalent | ||
{{kbd | key=TIMESTAMP}}: MS SQL 2008 and MySQL | {{kbd | key=TIMESTAMP}}: MS SQL 2008 and MySQL are '''NOT''' equivalent<ref>[http://stackoverflow.com/questions/8665548/sql-server-2008-timestamp-data-type SQL Server 2008 timestamp data type - Stack Overflow]</ref> {{exclaim}} | ||
* MS SQL 2008<ref>[http://msdn.microsoft.com/en-us/library/ms182776(v=sql.90).aspx timestamp (Transact-SQL)]</ref> ex: 0x00000000000007D3 | * MS SQL 2008<ref>[http://msdn.microsoft.com/en-us/library/ms182776(v=sql.90).aspx timestamp (Transact-SQL)]</ref> ex: 0x00000000000007D3 | ||
* MySQL ex: 2013-06-13 03:33:33 | * MySQL ex: 2013-06-13 03:33:33 | ||
further reading | |||
* [https://www.mssqltips.com/sqlservertutorial/2203/mysql-to-sql-server-data-type-comparisons/ MySQL to SQL Server Data Type Comparisons] | |||
* [http://wiki.ispirer.com/sqlways/sql-server/data-types Microsoft SQL Server - Data Types (Migration by Ispirer SQLWays)] {{access | date = 2015-12-22}} | |||
* [http://www.w3schools.com/sql/sql_datatypes.asp SQL Data Types for MS Access, MySQL, and SQL Server] {{access | date = 2015-12-22}} | |||
== tools == | == tools == | ||
ER圖(entity-relationship diagram) | ER圖(entity-relationship diagram) | ||
* [http://www.mysql.com/products/workbench/ MySQL :: MySQL Workbench 6.0]: Notice the installation prerequisites{{exclaim}} | * [http://www.mysql.com/products/workbench/ MySQL :: MySQL Workbench 6.0]: Notice the installation prerequisites{{exclaim}} | ||
產生資料庫結構表格文件 | |||
* [[Create database schema document]] | |||
參考其他資料表的結構設計<ref>[http://dev.mysql.com/doc/refman/5.0/en/getting-information.html MySQL :: MySQL 5.0 Reference Manual :: 3.4 Getting Information About Databases and Tables]</ref> | 參考其他資料表的結構設計<ref>[http://dev.mysql.com/doc/refman/5.0/en/getting-information.html MySQL :: MySQL 5.0 Reference Manual :: 3.4 Getting Information About Databases and Tables]</ref> | ||
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* [http://docs.oracle.com/cd/B28359_01/server.111/b28318/datatype.htm Oracle Data Types] | * [http://docs.oracle.com/cd/B28359_01/server.111/b28318/datatype.htm Oracle Data Types] | ||
* [http://www.databaseanswers.org/data_models/index.htm Industry Data Models] | * [http://www.databaseanswers.org/data_models/index.htm Industry Data Models] | ||
{{Template:Build a website}} | |||
[[Category:Web_Dev]] [[Category:Database]] [[Category:MySQL]] [[Category:Data Science]] | [[Category:Web_Dev]] [[Category:Database]] [[Category:MySQL]] [[Category:Data Science]] |
Revision as of 14:31, 13 March 2019
資料表欄位設計時,針對不同資料類型,建議的資料型態(data type)
examples of data and suggested datatype
birth year
- data type: int
- example: Range from 1905 ~ 2013 (108 yeas old) from the Sing-up form from outlook.com [Last visited: 2013-02-04]
- range/limit: 122 yeas old[1]
file name
file name for Win FTFS ; Linux ex3 and ex4 file system types[2].
- varchar(255) [3][4] If the files hosted by Windows server, you should also take the limit of PATH length into account besides the limit of filename length.
IP
IP(v4)
- varchar(15)
- ex: 255.255.255.255 [5]
range/limit
- IP range - Classless inter-domain routing (CIDR)[6]
- 12 or 24 bytes (IPv4 and IPv6 networks)[7]
- ex: 69.208.0.0/32
IPv6: 128位元長度,以16位元為一組,每組以冒號":"隔開,可以分為8組,每組以4位元十六進制方式表示
- data type:
- ex: 2001:0db8:85a3:08d3:1319:8a2e:0370:7344
網址
- data type: >= MySQL 5.0.3 use VARCHAR(2083)[8]; nvarchar(2083) for MS SQL
- 最大 URL 長度是在 Internet Explorer 中的 2,083 字元 for IE [9]
Chinese name
unix timestamp
- bigint(10) ;
- ex: 1328664539
- range/limit:
duration 時長
- data type: TIME 「TIME values may range from '-838:59:59' to '838:59:59'」[12]
- format: 小時:分鐘:秒 hh:mm:ss
- 參考別人: Google form 問卷題目選項的小時 0~72 ; 分鐘: 00~59: 秒: 00~59
學校代碼
School ID defined by MOE at Taiwan / 學校代碼[13]
- 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:
地址
- 資料類型: TEXT or VARCHAR(255)[14]
- 參考別人: 觀察 Google payment 付款地址的文字輸入框並沒有限制文字長度
經緯度 (經度,緯度)
價錢/金額
台灣縣市欄位值
台灣縣市欄位值 下拉式選單[19]
$city = array("基隆市", "台北市", "新北市", "桃園縣", "新竹市", "新竹縣", "苗栗縣", "台中市", "彰化縣", "南投縣", "雲林縣", "嘉義市", "嘉義縣", "台南市", "高雄市", "屏東縣", "台東縣", "花蓮縣", "宜蘭縣", "澎湖縣", "金門縣", "連江縣");
密碼
- varchar at least eight (8) characters[20]
雜湊碼 (hash value)
- MD5: CHAR(32)[21]
- SHA 256[22][23]:
- (1) HEX: CHAR(64) Using PHP: hash_file(), MySQL SHA2(str, hash_length)
- (2) Binary: BINARY(32) In PHP using hex2bin() e.g. echo hex2bin(hash_file('sha256', $file_path));, In MySQL using UNHEX() function e.g. SELECT UNHEX(SHA2('The quick brown fox jumped over the lazy dog.', 256))
Retrieve the hash value from string or file content
PHP:
<?php /* Create a file to calculate hash of */ file_put_contents('example.txt', 'The quick brown fox jumped over the lazy dog.'); echo hash_file('sha256', 'example.txt'); // expected result: 68b1282b91de2c054c36629cb8dd447f12f096d3e3c587978dc2248444633483 // 64 characters // calculate the hash of string echo hash('sha256', 'The quick brown fox jumped over the lazy dog.'); ?>
MySQL:
SELECT SHA2('The quick brown fox jumped over the lazy dog.', 256)
Retrieve the hash value from binary value
- PHP: bin2hex() e.g. echo bin2hex(hex2bin(hash('sha256', 'The quick brown fox jumped over the lazy dog.')));
- MySQL: Hexadecimal Literals e.g. SELECT HEX(UNHEX(SHA2('The quick brown fox jumped over the lazy dog.', 256)));[24]
membership
台灣公司統一編號
商品序號或商品條碼
MySQL: VARCHAR(14)
- GTIN 全球交易品項號碼(Global Trade Item Number) 最長 14 位數
- EAN 國際商品條碼(International Article Number),即前歐洲商品條碼 (European Article Number) and Japanese Article Number (JAN) 最長 13 位數
- UPC 通用產品代碼 (Universal Product Code) 最長 12 位數,只允許數字 (UPC-A)
- ASIN 亞馬遜標準識別號碼 (Amazon Standard Identification Number) 由十個字元(字母或數字)組成
書籍
- ISBN 國際標準書號(International Standard Book Number) 最長 13 位數
國際電話號碼
使用 Google libphonenumber 套件驗證國際電話號碼格式 – Frochu – Medium
很長的文字
(left blank intentionally) * data ** data type ** ex: ** range/limit:
comparision of datatypes in different database server
numeric
bigint
text
Storing Unicode text[32]
- MySQL: varchar / MS SQL 2008: nvarchar
- MySQL: LONGTEXT (4GB)[33] / MS SQL 2008: nvarchar(max) (2GB)[34]
date and time
DATETIME: ex: "2013-06-13 03:33:33"
- MS SQL 2008 & MySQL are equivalent
TIMESTAMP: MS SQL 2008 and MySQL are NOT equivalent[35]
- MS SQL 2008[36] ex: 0x00000000000007D3
- MySQL ex: 2013-06-13 03:33:33
further reading
- MySQL to SQL Server Data Type Comparisons
- Microsoft SQL Server - Data Types (Migration by Ispirer SQLWays) [Last visited: 2015-12-22]
- SQL Data Types for MS Access, MySQL, and SQL Server [Last visited: 2015-12-22]
tools
ER圖(entity-relationship diagram)
- MySQL :: MySQL Workbench 6.0: Notice the installation prerequisiteshttps://www.planetoid.info/images/Icon_exclaim.gif
產生資料庫結構表格文件
參考其他資料表的結構設計[37]
- DESCRIBE table_name;
references
- ↑ 最年長者 - 維基百科,自由的百科全書: 「根據金氏世界紀錄大全紀錄的最長壽者是活了122年的雅娜·卡爾曼特」、[https://zh.wikipedia.org/zh-tw/%E5%90%84%E5%9B%BD%E4%BA%BA%E5%8F%A3%E9%A2%84%E6%9C%9F%E5%AF%BF%E5%91%BD%E5%88%97%E8%A1%A8 各國人口預期壽命列表
- ↑ Type df -aT to list the file system types in Linux
- ↑ Comparison of file systems - Wikipedia, the free encyclopedia
- ↑ Naming Files, Paths, and Namespaces (Windows)
- ↑ Datatype for storing ip address in SQL Server - Stack Overflow
- ↑ Help:Range blocks - MediaWiki
- ↑ PostgreSQL: Documentation: Manuals: Network Address Types
- ↑ sql - Best database field type for a URL - Stack Overflow
- ↑
- ↑ 中國新聞網 (2010). 台灣“獨一姓氏”者達149人 最長姓名有13個字_台灣頻道_新浪網-北美
- ↑ 姓名8個字 外交部不給護照 - 生活 - 自由時報電子報
- ↑ MySQL :: MySQL 5.0 Reference Manual :: 11.3.2 The TIME Type
- ↑ 各級學校名錄--教育部統計處 Department of Statistics[Last visited: 2012-02-16]
- ↑ address
- ↑ mysql - What is the ideal data type for latitude / longitude? - Stack Overflow
- ↑ Creating a Store Locator with PHP, MySQL & Google Maps - Google Maps API Family - Google Code
- ↑ sql - Best Data Type for Currency - Stack Overflow[Last visited: 2012-03-07]
- ↑ mysql 用什么数据类型表示价格?_百度知道[Last visited: 2015-05-25]
- ↑ 取自中華郵政全球資訊網
- ↑ Password length & complexity - OWASP "Minimum length. Passwords should be at least eight (8) characters long."
- ↑ php - Can I use VARCHAR(32) for md5() values? - Stack Overflow
- ↑ mysql - How long is the SHA256 hash? - Stack Overflow
- ↑ 魚乾的筆記本: MD5被破解了,要改用SHA
- ↑ insert - Storing a binary SHA1 hash into a mySQL BINARY(20) column - Stack Overflow
- ↑ 公示資料查詢服務-財政部稅務入口網
- ↑ » 營利事業統一編號驗證完全手冊(Javascript,Java,C#,PHP) - Hero Think~用手摀住我的嘴
- ↑ MySQL :: MySQL 5.7 Reference Manual :: 11.1.3 String Type Overview
- ↑ MySQL TEXT 格式 的 長度限制 - Tsung's Blog
- ↑ nchar and nvarchar (Transact-SQL)
- ↑ int、bigint、smallint 和 tinyint (Transact-SQL)
- ↑ MySQL :: MySQL 5.5 Reference Manual :: 11.2.1 Integer Types (Exact Value) - INTEGER, INT, SMALLINT, TINYINT, MEDIUMINT, BIGINT
- ↑
- ↑ Whats SQL Server NVARCHAR(max) equivalent in MySQL? - Database Administrators Stack Exchange
- ↑ nchar 和 nvarchar (Transact-SQL)
- ↑ SQL Server 2008 timestamp data type - Stack Overflow
- ↑ timestamp (Transact-SQL)
- ↑ MySQL :: MySQL 5.0 Reference Manual :: 3.4 Getting Information About Databases and Tables
further reading
- MySQL :: MySQL 5.0 Reference Manual :: 10 Data Types
- SQL Server 2005 Data Types (Database Engine) / 資料類型 (Database Engine)
- Oracle Data Types
- Industry Data Models
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