怎么把一年的数据和几年的数据匹配

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1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str7 code int year
   
4. "       000004" 2013
   
5. "       000004" 2015
   
6. "       000004" 2016
   
7. "       000005" 2016
   
8. "       000006" 2015
   
9. "       000007" 2016
   
10. "       000008" 2013
    
11. "       000008" 2015
    
12. "       000009" 2014
    
13. "       000012" 2014
    
14. "       000012" 2016
    
15. "       000014" 2014
    
16. "       000016" 2013
    
17. "       000016" 2016
    
18. "       000017" 2014
    
19. "       000019" 2015
    
20. "       000020" 2015
    
21. "       000021" 2015
    
22. "       000021" 2016
    
23. "       000023" 2013
    
24. end

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1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str15 code int year byte industry
   
4. "000002" 2016 3
   
5. "000004" 2015 5
   
6. "000005" 2016 2
   
7. "000006" 2016 3
   
8. "000007" 2016 3
   
9. "000008" 2016 5
   
10. "000009" 2015 4
    
11. "000010" 2016 3
    
12. "000011" 2016 3
    
13. "000012" 2016 5
    
14. "000014" 2016 3
    
15. "000016" 2016 5
    
16. "000017" 2016 5
    
17. "000018" 2016 4
    
18. "000019" 2016 5
    
19. "000020" 2015 5
    
20. "000021" 2015 5
    
21. "000022" 2016 2
    
22. "000023" 2015 5
    
23. "000024" 2015 3
    
24. end

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我想把industry匹配到第一个数据上，然后只有code一样，那么该公司其他年份的industry也都一样

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1. 你者两个档都是多年的！2. 上面档的部分要改一下

1. input str17 code int year

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。3.

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str15 code int year
   
4. "       000004" 2013
   
5. "       000004" 2015
   
6. "       000004" 2016
   
7. "       000005" 2016
   
8. "       000006" 2015
   
9. "       000007" 2016
   
10. "       000008" 2013
    
11. "       000008" 2015
    
12. "       000009" 2014
    
13. "       000012" 2014
    
14. "       000012" 2016
    
15. "       000014" 2014
    
16. "       000016" 2013
    
17. "       000016" 2016
    
18. "       000017" 2014
    
19. "       000019" 2015
    
20. "       000020" 2015
    
21. "       000021" 2015
    
22. "       000021" 2016
    
23. "       000023" 2013
    
24. end
    
25. 
    
26. gen id = strtrim(code)
    
27. tempfile a
    
28. save `a'
    
29. 
    
30. * Example generated by -dataex-. To install: ssc install dataex
    
31. clear
    
32. input str15 code int year byte industry
    
33. "000002" 2016 3
    
34. "000004" 2015 5
    
35. "000005" 2016 2
    
36. "000006" 2016 3
    
37. "000007" 2016 3
    
38. "000008" 2016 5
    
39. "000009" 2015 4
    
40. "000010" 2016 3
    
41. "000011" 2016 3
    
42. "000012" 2016 5
    
43. "000014" 2016 3
    
44. "000016" 2016 5
    
45. "000017" 2016 5
    
46. "000018" 2016 4
    
47. "000019" 2016 5
    
48. "000020" 2015 5
    
49. "000021" 2015 5
    
50. "000022" 2016 2
    
51. "000023" 2015 5
    
52. "000024" 2015 3
    
53. end
    
54. 
    
55. gen id = strtrim(code)
    
56. merge 1:1 id year using `a'
    
57. sort id year

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