Web-Based Dynamic Similarity Distance Tool (WebSDT) uses similarity distance yo calculate the similarity between items or objects such as image/picture.
There are several types of algorithm used for similarity distance.
Source: import metadata
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SELECT SQL_CALC_FOUND_ROWS wpqn_comments.comment_ID FROM wpqn_comments WHERE ( comment_approved = '1' ) AND comment_post_ID = 1784 ORDER BY wpqn_comments.comment_date_gmt ASC, wpqn_comments.comment_ID ASC