how to match lookup value using CAML

When you query a Lookup field using CAML by default it will be executed for matching the text of lookup that is not desired in many cases like my.

<Query>
<Where>
<Eq>
<FieldRef Name="LookupFieldName" />
<Value Type="Lookup">1</Value>
</Eq>
</Where>
</Query>

We need to just set a property "LookupId" to true in FieldRef Tag like the following


<Query>
<Where>
<Eq>
<FieldRef Name="LookupFieldName" LookupId="True" />
<Value Type="Lookup">1</Value>
</Eq>
</Where>
</Query>

This will instruct the CAML engine to use the value property of lookup to execute the match.