Geek asks and answers

Avoid showing repetitive Poptart Flavors when they are warm

Please review the select statement:

  SELECT 
    fc.flavorid,
    fc.flavorname,
    CASE 
      WHEN sa.flavorid IS NULL THEN 'No'
      ELSE 'Yes' END ) IsEaten
    CASE 
      WHEN t.tempid IS NULL THEN 'No' 
      ELSE 'Yes' END ) IsWarm

  FROM [poptart] p

    LEFT JOIN [diet] d ON d.Active = 1
    LEFT JOIN [toaster] ts ON p.poptartid = ts.poptartid AND d.dietname = ts.dietname
    LEFT JOIN [flavor] fl ON fl.poptartid = ts.poptartid
    LEFT JOIN [flavorcolor] fc ON fc.flavorid = fl.flavorid

    LEFT OUTER JOIN [stomach] sa ON sa.flavorid = fc.flavorid

    LEFT JOIN [poptart] p2 ON ts.poptartid = p2.poptartid
    LEFT JOIN [temp] t ON t.tempid = p2.tempid AND t.Active = 1

  GROUP BY fc.flavorid,fc.flavorname,sa.flavorid,t.tempid
  ORDER By fc.flavorname

As you can see below, this returns one for each IsWarm value for the “berry”. I want only certain fragrance names to appear on this list, but the IsWarm field has become a problem because it can be Yes or No, and I want to show only Yes if Yes is available, and not “Yes” and “No”, pull out duplicate flavors like “berry”:

    flavorid  |  flavorname  |  IsEaten  |  IsWarm
      123     |    berry     |    No     |   Yes
      123     |    berry     |    No     |   No
      234     |    fudge     |    Yes    |   No
      235     |    honey     |    No     |   No

How to force this operator to return only this.?

  flavorid  |  flavorname  |  IsEaten  |  IsWarm
    123     |    berry     |    No     |   Yes
    234     |    fudge     |    Yes    |   No
    235     |    honey     |    No     |   No

Any suggestions?

+3
source share
1 answer

Try the following:

;WITH FlavorsList
AS
( 
    //Your query here
    SELECT 
      fc.flavorid,
      fc.flavorname,
    CASE 
      WHEN sa.flavorid IS NULL THEN 'No'
      ELSE 'Yes' END ) IsEaten
    CASE 
      WHEN t.tempid IS NULL THEN 'No' 
      ELSE 'Yes' END ) IsWarm

  FROM [poptart] p

    LEFT JOIN [diet] d ON d.Active = 1
    LEFT JOIN [toaster] ts ON p.poptartid = ts.poptartid 
                           AND d.dietname = ts.dietname
    LEFT JOIN [flavor] fl ON fl.poptartid = ts.poptartid
    LEFT JOIN [flavorcolor] fc ON fc.flavorid = fl.flavorid

    LEFT OUTER JOIN [stomach] sa ON sa.flavorid = fc.flavorid

    LEFT JOIN [poptart] p2 ON ts.poptartid = p2.poptartid
    LEFT JOIN [temp] t ON t.tempid = p2.tempid AND t.Active = 1

  GROUP BY fc.flavorid,fc.flavorname,sa.flavorid,t.tempid
)
SELECT fl.flavorid, fl.flavorname, fl.IsEaten, Max(fl.IsWarm)
FROM FlavorsList fl
GROUP BY fl.flavorid, fl.flavorname, fl.IsEaten
ORDER BY fl.flavorname

, , - , GROUP BY flavorid, flavorname, IsEated. MAX(IsWarm) , IsWarm DISTINCT vlafors. , CTE , .

+3

More articles:


All Articles