Hi,   I need some help here. I am trying to compare values of a visit variable in one dataset(Assessment )with that of a variable in another dataset(Treatment) to populate the treatment the subject was having during that visit. Assessment: ID   VISIT  VISDT   A      1         10 A      2         11 A      3         12 B      1         11 B      2         12 B      3         13   Treatment: ID  TRT  TRTDT A     x         9 A     x         10 A     y         11 A     x         12 B     x         11 B     y         12 B     y         14 B     x         15   I am trying to compare the VISDT from Assessment dataset with that of the Treatment dataset. If the VISIDT is equal to or between the TRTDT then I want the respective TRT values populated for Assessment dataset.   Thanks in advance. ... View more