CURSOR c
IS
SELECT COMPANYID,
GROUPID,
PERIODID,
FN_PPROCESSCURRENT
FROM LIQUIDATIONSDETAILS
WHERE PROCESSID = FN_PPROCESSPREVIOUS
AND (UNCOLLECTED > 0 OR INVOICE = 0)
AND (((GROUPID = vgroupid) AND (vgroupid > -1)) OR (vgroupid = -1))
например:ако vgroupid = -1 , тогава последното условие ще бъде (((GROUPID = -1) AND (-1 > -1)) OR (-1 = -1)) или ((forever_false AND forever_false) OR (forever_true)) или (-1 = -1) - всички записи
вместо това, ако vgroupid = 123 последното условие ще бъде (((GROUPID = 123) AND (123 > -1)) OR (123 = -1)) или (((GROUPID = 123) and forever_true) OR (forever_false)) или (GROUPID = 123) - само 123 GROUPID
