{"id":5384,"date":"2013-04-21T00:00:49","date_gmt":"2013-04-21T00:00:49","guid":{"rendered":"http:\/\/craftydba.com\/?p=5384"},"modified":"2017-10-08T16:25:06","modified_gmt":"2017-10-08T16:25:06","slug":"string-functions-soundex","status":"publish","type":"post","link":"https:\/\/craftydba.com\/?p=5384","title":{"rendered":"String Functions – SOUNDEX()"},"content":{"rendered":"

\"\"<\/a>
\nI am going to continue my series of very short articles or tidbits on Transaction SQL string functions. I will exploring the SOUNDEX() function today.<\/p>\n

The SOUNDEX()<\/a> function calculates a four-character code that is based on how the string sounds when spoken. Please see my prior blog entry<\/a> for a sample use of this function in conjunction with the DIFFERENCE()<\/a> function.<\/p>\n

Soundex<\/a> was developed by Robert C. Russell and Margaret K. Odell and patented in 1918 \/ 1922. The United States government created a variation named the American Soundex which was used in the 1930s for retrospective analysis of the US censuses from 1890 through 1920.<\/p>\n

The system became popular when Donald Knuth’s<\/a> reference it in his book named “The Art of Computer Programming”.<\/p>\n

The current American Soundex standard is maintained by the National Archives and Records Administration (NARA<\/a>).<\/p>\n

I will not go into the nitty gritty details of the rules for this system. However, I want to review how the word ‘Mongoose’ recieves a soundex code of M522.<\/p>\n

\r\n-- Get phonetic algorithm code\r\nselect soundex('Mongoose') as word_val\r\n<\/pre>\n
\r\noutput: \r\n\r\nword_val\r\n----------\r\nM522\r\n<\/pre>\n<\/p>\n
The system disregards the letters A, E, I, O, U, H, W, and Y.  A soundex code always starts with the first letter of the word.  It is followed by a three digit number.  Zeros are added at the end if neccessary.<\/p>\n
Therefore, ‘Mongoose’ becomes ‘ngs’.  Given the lookup table, the number 522 represents this sequence.  Finally, the first letter and number are combined into the code ‘M522’.<\/p>\n
In summary, the SOUNDEX() function is a great way to hash words into codes by considering what sounds simular.  Next time, I will be talking about the SPACE()<\/a> function.<\/p>\n","protected":false},"excerpt":{"rendered":"
I am going to continue my series of very short articles or tidbits on Transaction SQL string functions. I will exploring the SOUNDEX() function today. The SOUNDEX() function calculates a four-character code that is based on how the string sounds when spoken. Please see my prior blog entry for a sample use of this function in conjunction with the DIFFERENCE() function. Soundex was developed by Robert C. Russell and Margaret K. Odell and patented in 1918 \/ 1922. The United States government created a variation named the American Soundex which…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[814],"tags":[31,15,831,815,29],"class_list":["post-5384","post","type-post","status-publish","format-standard","hentry","category-very-short-articles","tag-database-developer","tag-john-f-miner-iii","tag-soundex","tag-string-function","tag-tsql"],"_links":{"self":[{"href":"https:\/\/craftydba.com\/index.php?rest_route=\/wp\/v2\/posts\/5384","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/craftydba.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/craftydba.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/craftydba.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/craftydba.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5384"}],"version-history":[{"count":0,"href":"https:\/\/craftydba.com\/index.php?rest_route=\/wp\/v2\/posts\/5384\/revisions"}],"wp:attachment":[{"href":"https:\/\/craftydba.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5384"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/craftydba.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5384"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/craftydba.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}