Hi Eddy,
Your query is correct. It should fetch all the 77400 from your custom table.
But I think, since you are in the debugging mode. You would have check the internal table records, when the debugger point is on your select query, at that point of time your select query will not be executed, so you are getting 0 records.
After your select query add this statement,
IF SY-SUBRC = 0.
ENDIF.
Now keep the breakpoint on the IF statement and execute. You may get the expected result