How to bump most helpful reviews to the top?

Picture this, I have a bunch of products, each product has a review section, if someone leaves a good review their review gets a like to inform that other users found it helpful.

I have a table named CustomerReview, and another table named likeReview, and inside this table (likeReview) I have a column:

isLike(values true, false or null)

I need to make this table bump the most helpful reviews to the top of the list.

How should I go about that?

I get an error with My SQL trying to make isLike do that, because there are reviews (CustomerReview) that are not associated with the likeReview table.

SELECT {c.pk} 
FROM{ CustomerReview as c LEFT JOIN LikeReview as l ON {c.pk} = {l.pk} } 
WHERE {c.product}=?product 
  AND {c.LANGUAGE}=?language 
ORDER BY   {l.ISLIKE } ;

my items.xml

        <relation code="Review2User" localized="false"
              generate="true" autocreate="true">
        <sourceElement qualifier="likeReview" type="LikeReview"
                       cardinality="many" >
        </sourceElement>
        <targetElement qualifier="customerReview" type="CustomerReview"
                       cardinality="one">
        </targetElement>
    </relation>

relation

        <typegroup name="LikeReview">
        <itemtype code="LikeReview" autocreate="true" generate="true">
            <deployment table="likeReview" typecode="15088"/>

            <attributes>
                <attribute type="Customer" qualifier="customer" >
                    <modifiers optional="false" unique="true"/>
                    <persistence type="property"/>
                </attribute>
                <attribute type="CustomerReview" qualifier="review" >
                    <modifiers optional="false" unique="true"/>
                    <persistence type="property"/>
                </attribute>
                <attribute qualifier="isLike" type="java.lang.Boolean">
                    <defaultvalue>Boolean.FALSE</defaultvalue>
                    <persistence type="property"/>
                </attribute>
            </attributes>
        </itemtype>
    </typegroup>

Try to join using ON {c.pk} = {l.customerReview}

SELECT {c.pk}
FROM { CustomerReview c LEFT JOIN
     LikeReview l
     ON {c.pk} = {l.customerReview} }
WHERE {c.product} = ?product AND
      {c.LANGUAGE} = ?language
GROUP BY {c.pk}
ORDER BY SUM(CASE WHEN {l.ISLIKE} = "true" THEN 1 ELSE 0 END) DESC