SELECT CASE T-SQL

• Johann Montfort

  Hall of Fame

  Points: 3123

  More actions

  April 14, 2009 at 6:19 am

  #129306

  HI All,

  I have the following code at the moment

  SELECT * FROM

  (

  SELECT vidID, vidDate, vidTitle, vidDesc, AddedBy, OnlyForMembers, ViewCount,

  ROW_NUMBER() OVER (ORDER BY vidDate DESC) AS RowNum

  FROM HS_Videos hv INNER JOIN HS_Video_Tags hvt ON hv.vidID = hvt.fk_vidID WHERE ((@TagID = 0) or (@TagID <> 0 and hvt.fk_tagId = @TagID))

  ) Videos

  WHERE Videos.RowNum BETWEEN (@PageIndex*@PageSize+1) AND ((@PageIndex+1)*@PageSize)

  ORDER BY vidDate DESC

  When the TagID > 0, it works fine, however when the TagID = 0, then its displaying the same video according the the number of tags is has, because of the INNER JOIN. Is it possible to do a CASE or IF Clause, to specify that if the TagID = 0, then ommit the INNER JOIN, and do a normal select?

  Thanks for your help and time

• mister.magoo

  SSC-Forever

  Points: 47174

  More actions

  April 14, 2009 at 6:42 am

  #977168

  Johann Montfort (4/14/2009)

  ---

  HI All,

  I have the following code at the moment

  SELECT * FROM

  (

  SELECT vidID, vidDate, vidTitle, vidDesc, AddedBy, OnlyForMembers, ViewCount,

  ROW_NUMBER() OVER (ORDER BY vidDate DESC) AS RowNum

  FROM HS_Videos hv INNER JOIN HS_Video_Tags hvt ON hv.vidID = hvt.fk_vidID WHERE ((@TagID = 0) or (@TagID <> 0 and hvt.fk_tagId = @TagID))

  ) Videos

  WHERE Videos.RowNum BETWEEN (@PageIndex*@PageSize+1) AND ((@PageIndex+1)*@PageSize)

  ORDER BY vidDate DESC

  When the TagID > 0, it works fine, however when the TagID = 0, then its displaying the same video according the the number of tags is has, because of the INNER JOIN. Is it possible to do a CASE or IF Clause, to specify that if the TagID = 0, then ommit the INNER JOIN, and do a normal select?

  Thanks for your help and time

  Try this:

  SELECT * FROM

  (

  SELECT vidID, vidDate, vidTitle, vidDesc, AddedBy, OnlyForMembers, ViewCount,

  ROW_NUMBER() OVER (ORDER BY vidDate DESC) AS RowNum

  FROM HS_Videos hv LEFT OUTER JOIN HS_Video_Tags hvt ON hv.vidID = hvt.fk_vidID AND hvt.fk_tagId = @TagID

  WHERE @TagID=0 OR NOT (hvt.fk_tagId IS NULL)

  ) Videos

  WHERE Videos.RowNum BETWEEN (@PageIndex*@PageSize+1) AND ((@PageIndex+1)*@PageSize)

  ORDER BY vidDate DESC

  MM
  

  ---

  
  select geometry::STGeomFromWKB(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