I am writing below SQL query in mapbasic to insert columns from two tables t1 and t2 into table Sites but error is occuring "Variable or field t2.CELLID not defined"

Table Sites (Source integer, N integer, LAT float, LONG float) Select t1.CELLID, t2.CELLID, t2.LATITUDE, t2.LONGITUDE from t1 left join t2 on t1.CELLID=t2.CELLID where t1.obj within zone into Sites

Can anyone tell me how to rectify it?

  • Unfortunately MapBasic only allows inner joins so you will not be able to perform a left, right, or full join directly like that though there are workarounds involving more steps. Also, it's not clear what zone relates to in the query... is that an object variable?
    – T_Bacon
    Jul 24, 2017 at 7:23

1 Answer 1


You can try this:

Table Sites (Source integer, N integer, LAT float, LONG float)

Select t1.CELLID "CellID1", t2.CELLID "CellID2", t2.LATITUDE, t2.LONGITUDE 
  From t1, t2 
  Where t1.CELLID = t2.CELLID 
  And t1.obj within zone 
  into __TO__INSERT
Insert Into Sites
   From __TO__INSERT

But notice that you will only insert the records where there is a match between the CellIDs in the two tables. As @Tom_Bacon mentioned, MapInfo SQL doesn't support outer joins.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.