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Editorial Team
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Asked: 2026-06-13T05:01:37+00:00

How can I get the count is 0 if it is null. when I

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How can I get the count is 0 if it is null. when I run with the following statement:

SELECT S.shortText, COUNT(O.selectionID) AS C FROM Opinions O
LEFT JOIN Selections S ON S.id=O.selectionID
WHERE S.qID=3 AND MONTH(O.entryDate)=5 
GROUP BY S.shortText

 shortText         C    
 ----------------  ---- 
 Leisure           0       <------ this line missing 
 Business          3
 University visit  1

My Selections Table

 id     shortText        
 -----  ---------------- 
 1      Leisure          
 2      Business         
 3      University visit

My Opinions Table

 id     entryDate              selectionID    
 -----  ---------------------  -------------- 
 186    5/21/2012 11:34:37 AM  2              
 205    5/22/2012 9:13:25 AM   2              
 216    5/22/2012 9:43:14 AM   2              
 237    5/24/2012 8:24:00 PM   3
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1 Answer

  1. Editorial Team

    If you want to display the Leisure rows as 0 even there is no matching record in opinions table. Use subquery as below:

    select t1.shorttext,if(t2.c is null,0,t2.c)as c from selections t1 left join (

SELECT s.id,S.shortText, COUNT(O.selectionID) AS C FROM selections S
LEFT JOIN opinions O ON S.id=O.selectionID
WHERE  MONTH(O.entryDate)=5 
GROUP BY S.shortText
  ) t2 on t1.id=t2.id

    http://sqlfiddle.com/#!2/8ca3e/11

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