How to search 50% to 80% from a database column which has contained lots of paragraph text.

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I want to search 50% to 80% similar text from a database column.

The rows of that particular column has contained lots of paragraph text. From this text

I need to find out which are all the rows has similar text in that particular column.

If required, then use function.

Posted 15-May-15 4:39am

Bittu14

Updated 16-May-15 3:20am

v2

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Tomas Takac 15-May-15 10:51am

Homework? Show what you have tried so far. Explain where you are stuck.

Sergey Alexandrovich Kryukov 15-May-15 13:40pm

Define "similarity". This is very non-trivial issue, something which is very hard to define. Example is not a definition, of course.
—SA

2 solutions

Solution 2

Yes, OriginalGriff is right, but you may want to know a bit more about text similarity algorithms.

Please, follow below links:
Pattern Matching: the Gestalt Approach[^]
Simil: An algorithm to look for similar strings[^]
Text similarity algorithm - solution 2[^]

Posted 15-May-15 5:32am

Maciej Los

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OriginalGriff · Accepted Answer · 2015-05-15T04:50:00

Don't do it in SQL.
SQL string handling is - at best - pretty basic.

And what you want to do is pretty complicated.
Seriously: This is overkill for your purposes, probably, but it's an advanced form of what you are asking for: Levenshtein Edit Distance Algorithm[^]

Do this in your "real" programming language, whichever that is. SQL is a poor choice.