<P> The output Concept contains only records that fulfill the SQL condition formulated 
  by the parameters of this operator. This operator is <B>loopable</B>! If applied 
  in a loop, the conditions from the different loops are connected by AND. Every 
  condition consists of a left-hand side, an SQL operator and a right-hand side. 
  Together, these three must form a valid SQL condition. For example, to specify 
  that only records (rows) whose value of attribute <TT>sale</TT> is either or 
  should be selected, the left condition is the BaseAttribute for <TT>sale</TT>, 
  the operator is <I>IN</I>, and the right condition is (50,60). 
<P> If this operator is applied in a loop, only the three parameters modelling 
  the condition change from loop to loop, while input and output Concept remain 
  the same. 
<P> <BR>
  <BR>
<P> 
PARAMETERDESCRIPTION
TheInputConcept:inherited (same in all loops)
TheLeftCondition:any BA of input concept
TheConditionOperator:an SQL operator: &lt;,= ,... 
TheRightCondition:&nbsp;
TheOutputConcept:inherited (same in all loops)
