Pg . में एक दूसरे से सटे दो शब्दों वाले वाक्य खोजें

आसान समाधान, लेकिन केवल तभी परिणाम देता है, जब item.position . में कोई अंतराल न हो रों:

SELECT DISTINCT sentence.sentenceid 
  FROM sentence 
  JOIN item ON sentence.sentenceid = item.sentenceid
  JOIN word ON item.wordid = word.wordid
  JOIN item AS next_item ON sentence.sentenceid = next_item.sentenceid
                        AND next_item.position = item.position + 1
  JOIN word AS next_word ON next_item.wordid = next_word.wordid
 WHERE word.spelling = 'word1'
   AND next_word.spelling = 'word2'

विंडो फ़ंक्शंस का उपयोग करके अधिक सामान्य समाधान :

SELECT DISTINCT sentenceid
FROM (SELECT sentence.sentenceid,
             word.spelling,
             lead(word.spelling) OVER (PARTITION BY sentence.sentenceid
                                           ORDER BY item.position)
        FROM sentence 
        JOIN item ON sentence.sentenceid = item.sentenceid
        JOIN word ON item.wordid = word.wordid) AS pairs
 WHERE spelling = 'word1'
   AND lead = 'word2'

संपादित करें :इसके अलावा सामान्य समाधान (अंतराल की अनुमति है), लेकिन केवल जुड़ने के साथ:

SELECT DISTINCT sentence.sentenceid
  FROM sentence 
  JOIN item ON sentence.sentenceid = item.sentenceid
  JOIN word ON item.wordid = word.wordid
  JOIN item AS next_item ON sentence.sentenceid = next_item.sentenceid
                        AND next_item.position > item.position
  JOIN word AS next_word ON next_item.wordid = next_word.wordid
  LEFT JOIN item AS mediate_word ON sentence.sentenceid = mediate_word.sentenceid
                                AND mediate_word.position > item.position
                                AND mediate_word.position < next_item.position
 WHERE mediate_word.wordid IS NULL
   AND word.spelling = 'word1'
   AND next_word.spelling = 'word2'