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SQL Anywhere 12.0.0 (Français) » SQL Anywhere Server - SQL Usage » Querying and modifying data » Full text search » How to perform a full text search

 

Tutorial: Performing a fuzzy full text search

Use the following procedure to perform a fuzzy full text search on a text index that uses an NGRAM term breaker.

See also: Tutorial: Performing a full text search on a GENERIC text index.

 ♦  Perform a fuzzy full text search on an NGRAM term index
  1. Start Interactive SQL and connect to the sample database using the SQL Anywhere 12 Demo data source.

  2. Execute the following statement to create a text configuration object called myFuzzyTextConfig.

    CREATE TEXT CONFIGURATION myFuzzyTextConfig FROM default_char;
  3. Execute the following statement to change the term breaker to NGRAM and set the maximum term length to 3. Fuzzy searches are performed using n-grams. Separate ALTER TEXT CONFIGURATION statements are used to implement these changes:

    ALTER TEXT CONFIGURATION myFuzzyTextConfig
       TERM BREAKER NGRAM;
    ALTER TEXT CONFIGURATION myFuzzyTextConfig
       MAXIMUM TERM LENGTH 3;
  4. Start Sybase Central and connect to the sample database using the SQL Anywhere 12 Demo data source.

  5. Create a copy of the MarketingInformation table.

    1. In Sybase Central, expand the Tables folder.

    2. Right-click MarketingInformation and choose Copy.

    3. Right-click the Tables folder and choose Paste.

    4. In the Name field, type MarketingInformation2. Click OK.

  6. In Interactive SQL, execute the following command to add data to the MarketingInformation2 table:

    INSERT INTO MarketingInformation2
       SELECT * FROM MarketingInformation;
  7. Execute the following command to create a text index on the MarketingInformation2.Description column that references the myFuzzyTextConfig text configuration object:

    CREATE TEXT INDEX myFuzzyTextIdx ON MarketingInformation2 ( Description ) 
       CONFIGURATION myFuzzyTextConfig;
  8. Execute the following statement to check for terms similar to coten:

    SELECT MarketingInformation2.Description, ct.* 
        FROM MarketingInformation2 CONTAINS ( MarketingInformation2.Description, 'FUZZY "coten"' ) ct 
        ORDER BY ct.score DESC;
    Description Score
    <html><head><meta http-equiv=Content-Type content="text/html; charset=windows-1252"><title>Sweatshirt</title></head><body lang=EN-US><p><span style='font-size:10.0pt;font-family:Arial'>Lightweight 100% organically grown cotton hooded sweatshirt with taped neck seams. Comes pre-washed for softness and to lessen shrinkage.</span></p></body></html> 0.9461597363521859
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    <html><head><meta http-equiv=Content-Type content="text/html; charset=windows-1252"><title>Visor</title></head><body lang=EN-US><p><span style='font-size:10.0pt;font-family:Arial'>Lightweight 100% organically grown cotton construction. Shields against sun and precipitation. Metallic ions in the fibers inhibit bacterial growth, and help neutralize odor.</span></p></body></html> 0.9134171046194403
    <html><head><meta http-equiv=Content-Type content="text/html; charset=windows-1252"><title>Sweatshirt</title></head><body lang=EN-US><p><span style='font-size:10.0pt;font-family:Arial'>Top-notch construction includes durable topstitched seams for strength with low-bulk, resilient rib-knit collar, cuffs and bottom. An 80% cotton/20% polyester blend makes it easy to keep them clean.</span></p></body></html> 0.8856420222728282
    <html><head><meta http-equiv=Content-Type content="text/html; charset=windows-1252"><title>Baseball Cap</title></head><body lang=EN-US><p><span style='font-size:10.0pt;font-family:Arial'>This fashionable hat is ideal for glacier travel, sea-kayaking, and hiking. With concealed draw cord for windy days.</span></p></body></html> 0
    <html><head><meta http-equiv=Content-Type content="text/html; charset=windows-1252"><title>Baseball Cap</title></head><body lang=EN-US><p><span style='font-size:10.0pt;font-family:Arial'>A lightweight wool cap with mesh side vents for breathable comfort during aerobic activities. Moisture-absorbing headband liner.</span></p></body></html> 0
    <html><head><meta http-equiv=Content-Type content="text/html; charset=windows-1252"><title>Tee Shirt</title></head><body lang=EN-US><p><span style='font-size:10.0pt;font-family:Arial'>We've improved the design of this perennial favorite. A sleek and technical shirt built for the trail, track, or sidewalk. UPF rating of 50+.</span></p></body></html> 0
    <html><head><meta http-equiv=Content-Type content="text/html; charset=windows-1252"><title>Tee Shirt</title></head><body lang=EN-US><p><span style='font-size:10.0pt;font-family:Arial'>A sporty, casual shirt made of recycled water bottles. It will serve you equally well on trails or around town. The fabric has a wicking finish to pull perspiration away from your skin.</span></p></body></html> 0
    <html><head><meta http-equiv=Content-Type content="text/html; charset=windows-1252"><title>Tee Shirt</title></head><body lang=EN-US><p><span style='font-size:10.0pt;font-family:Arial'>This simple, sleek, and lightweight technical shirt is designed for high-intensity workouts in hot and humid weather. The recycled polyester fabric is gentle on the earth and soft against your skin.</span></p></body></html> 0
    <html><head><meta http-equiv=Content-Type content="text/html; charset=windows-1252"><title>Visor</title></head><body lang=EN-US><p><span style='font-size:10.0pt;font-family:Arial'>A polycarbonate visor with an abrasion-resistant coating on the outside. Great for jogging in the spring, summer, and early fall. The elastic headband has plenty of stretch to give you a snug yet comfortable fit every time you wear it.</span></p></body></html> 0
    Note

    The last six rows have terms that contain matching n-grams. However, no scores are assigned to them because all rows in the table contain these terms.

  9. Disconnect from Interactive SQL and Sybase Central.

  10. (optional) Restore the sample database (demo.db) to its original state by following the steps found here: Recreate the sample database (demo.db).

 See also