BDI302cXuất hiện trong 2 đề thi
What does the following do?\ndf.select("userid", "teamlevel").show(5)
Các lựa chọn
ASelect the rows named "userid" and "teamlevel" and display first 5 rows.
BDisplay all rows except "userid" and "teamlevel".
CSelect the columns named "userid" and "teamlevel" and display first 5 rows.
DDisplay all columns except "userid" and "teamlevel".