Eugene,
There are different ways to do this:

cond1 = [ MyField1 = MyCond1 ]
cond2 = [ AND MyField2 = MyCond2 ]
condn = [ AND MyField3 = MyCond3 ]

SELECT * FROM < My Table > WHERE &cond1 &cond2 &condn

or

lcWhere = [ WHERE MyField1 = MyCond1 ]+;
          [ AND MyField2 = MyCond2 ]+;
          [ AND MyField3 = MyCond3 ]

SELECT * FROM < My Table > &lcWhere

HTH

>I need to build SQL-statement and the problem is that I have too many conditions in WHERE-clause. I try to store them in some variables and then use the "&a1.a2.a3..." expression to append conditions in a query. But it generates error message during execution. Maybe anybody knows the way to solve this problem ?