The Geq element is an arithmetic operator that means "greater than or equal to." It can be used within a Where element in a view definition.
<Query>
<Where>
<Or>
<IsNull>
<FieldRef Name="Expires" />
</IsNull>
<Geq>
<FieldRef Name="Expires" />
<Value Type="DateTime">
<Today />
</Value>
</Geq>
</Or>
</Where>
<OrderBy>
<FieldRef Name="Modified" Ascending="FALSE" />
</OrderBy>
</Query>
2.Eq(=)
The Eq element is an arithmetic operator that means "equal to" and is used within the Query element.
<Query>
<OrderBy>
<FieldRef Name="Modified" Ascending="FALSE"></FieldRef>
</OrderBy>
<Where>
<Or>
<Eq>
<FieldRef Name="Status"></FieldRef>
<Value Type="Text">Completed</Value>
</Eq>
<IsNull>
<FieldRef Name="Status"></FieldRef>
</IsNull>
</Or>
</Where>
</Query>
3.Gt(>)
The Gt element is an arithmetic operator that means "greater than." This element is used similarly to Eq and Lt.
<Query>
<Where>
<Or>
<IsNull>
<FieldRef Name="Deadline" />
</IsNull>
<Gt>
<FieldRef Name="Deadline" />
<Value Type="DateTime">
<Today />
</Value>
</Gt>
</Or>
</Where>
<OrderBy>
<FieldRef Name="Modified" Ascending="FALSE" />
</OrderBy>
</Query>
4.Lt(<)
The Lt element is an arithmetic operator that means "less than" and is used in queries in views. This element is used similarly to Eq and Gt.
<Query>
<Where>
<Or>
<IsNull>
<FieldRef Name="Deadline" />
</IsNull>
<Lt>
<FieldRef Name="Deadline" />
<Value Type="DateTime">
<Today />
</Value>
</Lt>
</Or>
</Where>
<OrderBy>
<FieldRef Name="Modified" Ascending="FALSE" />
</OrderBy>
</Query>
5.Neq(!=)
The Neq element is an arithmetic operator that means "not equal to" and is used in queries.
<Query>
<OrderBy>
<FieldRef Name="Modified" Ascending="FALSE"></FieldRef>
</OrderBy>
<Where>
<Or>
<Neq>
<FieldRef Name="Status"></FieldRef>
<Value Type="Text">Completed</Value>
</Neq>
<IsNull>
<FieldRef Name="Status"></FieldRef>
</IsNull>
</Or>
</Where>
</Query>