I have a question. Please help.
I have two dataframe. data1 and data2

data1 has following data

```
HHID..... blockid....serial_number...name
100............1............1.........xxx
100............2............2.........yyy
100............1............3.........zzz
200............1........... 1.........sss
200............1............2.........ddd

```

data2 is as below

```
HHID-.......serial....... hospital
100...........3...............Delhi
200...........2...............paris

```

Now,i want to select rows in data1 based on HHID and serial in data2. For eg, here, in data2, we can see a row with HHID 100 and serial 3. So, I want select only that row from data1 where HHID is 100 and serial is 3. Similarly for HHID 200 and serial 2. Also, when I select row from data1, I dont want any extra columns from data2. All I care about is if HHID and serial in data2 is matching in data1. If it does, then I need that complete row in data1. So the output should be as follows

```
HHID....blockid.....serial....name
100..... .....1........3......zzz
200...........1........2......ddd

```

Can somebody help?

Thank you