I have the following two data sets that looks like:
 
| ID | X | Y | Z | 
| 4 | 24 | 23 | 29 | 
| 5 | 42 | 31 | 36 | 
| 6 | 50 | 43 | 42 | 
| 7 | 43 | 31 | 21 | 
| 8 | 50 | 44 | 28 | 
| 9 | 42 | 49 | 30 | 
and 
| ID | W | 
| 1 | 60 | 
| 2 | 78 | 
| 3 | 93 | 
| 4 | 43 | 
| 5 | 98 | 
| 6 | 97 | 
| 7 | 83 | 
| 8 | 51 | 
| 9 | 83 | 
| 10 | 42 | 
| 11 | 63 | 
| 12 | 95 | 
| 13 | 46 | 
| 14 | 72 | 
I want to merge these for only complete information. I.e. I want to keep all of the ID's for the first data set and create a new column W which comes from the second data set. My desired result looks like this:
| ID | X | Y | Z | W | 
| 4 | 24 | 23 | 29 | 43 | 
| 5 | 42 | 31 | 36 | 98 | 
| 6 | 50 | 43 | 42 | 97 | 
| 7 | 43 | 31 | 21 | 83 | 
| 8 | 50 | 44 | 28 | 51 | 
| 9 | 42 | 49 | 30 | 83 | 
How can I achieve this result?