在SAS如何從另外兩個創建3臺，基於特定條件

Question

這是我的數據集1（T1）：

data sample1; 
    infile cards truncover expandtabs; 
    input MACH $ EVENT $ DATE :date. TIME :time. PMACH $ PXMACH $ SITE $ RAD MILVAL SF; 
    format date date8. time HHMM.; 
cards; 
US0001 Lat 02JAN13 19:24 . . . 876 2660403.00000 1 
US0001 Cre 29MAY13 0:00 7611 I1124P 1 . 2734440.00000 1 
US0001 Cre 31JAN14 0:00 7402 I1015P 2 . 2735017.00000 1 
US0001 Lat 12JAN15 7:00 . . . . 2900334.00000 1 
US000323 Lat 13OCT12 19:37 . . . 852.2 1332753.00000 1 
US000323 WI 25OCT12 0:00 . . . . 1342148.00000 1 
US000323 Rem 31OCT12 0:00 7416 I1079P 3 . 1346049.00000 1 
US000323 Lat 31OCT12 14:03 . . . 890.5 1346049.00000 1 
US000323 Inst 11JAN13 0:00 7408 I1034P 3 . 1346049.00000 1 
US000323 Lat 16.marras.13 19:52 . . . 888.7 1417443.00000 1 
US000323 Lat 12OCT13 13:49 . . . 886.7 1606899.00000 1 
US000323 Lat 12OCT13 14:17 . . . 886.7 1606899.00000 1 
US000323 Rem 24MAY14 0:00 7408 I1034P 3 . 1812537.00000 1 
US000328 Lat 31JAN13 23:41 853.2 2040610.00000 1 
US000328 Cre 03FEB13 0:00 7209 I1115P 3 . 2040610.00000 1 
US000328 Lat 17MAY13 12:43 . . . 847.2 2134438.00000 1 
US000328 Lat 17MAY13 12:46 . . . 847.2 2134438.00000 1 
US000328 Lat 02SEP13 15:03 . . . 846.3 2134438.00000 1 
US000328 Cre 18JUL14 0:00 7218 I1152P 3 . 2134438.00000 1 
US000328 Lat 25SEP14 8:54 . . . 842.4 2180863.00000 1 
US000328 Inst 15FEB15 0:00 7508 I1098P 3 . 2180863.00000 1 
US000328 Cre 21MAY15 0:00 7212 I1098P 3 . 2232830.00000 1 
US000328 WI 24JUN15 0:00 . . . . 2232830.00000 1 
US000328 Lat 13JUL15 0:00 . . . 890.2 2232830.00000 1 
; 

這是我的數據集2（T2）：

data sample2; 
infile cards truncover expandtabs; 
input Mach $ Date : date9. Data $; 
format date : date9.; 
cards; 
US0001 28Dec2012 dassssd 
US0001 . 322234 
US0001 30Dec2012 sadasd 
US0001 . 1213 
US0001 01Jan2013 asdsds 
US0001 02Jan2013 zxcxzc 
US0001 03Jan2013 asdad 
US0001 04Jan2013 zxczc 
US0001 . zxcc 
US0001 06Jan2013 zxc 
US0001 07Jan2013 czxcxzc 
US0001 24May2013 zxcwef 
US0001 . x 
US0001 26May2013 dassssd 
US0001 . 322234 
US0001 28May2013 sadasd 
US0001 29May2013 1213 
US0001 30May2013 asdsds 
US0001 . zxcxzc 
US0001 01Jun2013 asdad 
US0001 02Jun2013 zxczc 
US0001 03Jun2013 zxcc 
US0001 . zxc 
US0001 27Jan2014 czxcxzc 
US0001 . zxcwef 
US0001 29Jan2014 x 
US0001 30Jan2014 dassssd 
US0001 31Jan2014 322234 
US0001 01Feb2014 sadasd 
US0001 02Feb2014 1213 
US0001 . asdsds 
US0001 04Feb2014 zxcxzc 
US0001 05Feb2014 asdad 
US0001 07Jan2015 zxczc 
US0001 . zxcc 
US0001 09Jan2015 zxc 
US0001 10Jan2015 czxcxzc 
US0001 11Jan2015 zxcwef 
US0001 12Jan2015 x 
US0001 . dassssd 
US0001 14Jan2015 322234 
US0001 15Jan2015 sadasd 
US0001 . 1213 
US0001 17Jan2015 asdsds 
US000323 08Oct2012 zxcxzc 
US000323 09Oct2012 asdad 
US000323 10Oct2012 zxczc 
US000323 . zxcc 
US000323 12Oct2012 zxc 
US000323 13Oct2012 czxcxzc 
US000323 . zxcwef 
US000323 15Oct2012 x 
US000323 16Oct2012 dassssd 
US000323 17Oct2012 322234 
US000323 18Oct2012 sadasd 
US000323 . 1213 
US000323 21Oct2012 asdsds 
US000323 22Oct2012 zxcxzc 
US000323 . asdad 
US000323 24Oct2012 zxczc 
US000323 25Oct2012 zxcc 
US000323 26Oct2012 zxc 
US000323 27Oct2012 czxcxzc 
US000323 28Oct2012 zxcwef 
US000323 29Oct2012 x 
US000323 30Oct2012 dassssd 
US000323 26Oct2012 322234 
US000323 . sadasd 
US000323 28Oct2012 1213 
US000323 29Oct2012 asdsds 
US000323 30Oct2012 zxcxzc 
US000323 . asdad 
US000323 01Nov2012 zxczc 
US000323 02Nov2012 zxcc 
US000323 03Nov2012 zxc 
US000323 04Nov2012 czxcxzc 
US000323 05Nov2012 zxcwef 
US000323 26Oct2012 x 
US000323 . dassssd 
US000323 28Oct2012 322234 
US000323 29Oct2012 sadasd 
US000323 30Oct2012 1213 
US000323 31Oct2012 asdsds 
US000323 01Nov2012 zxcxzc 
US000323 02Nov2012 asdad 
US000323 03Nov2012 zxczc 
US000323 04Nov2012 zxcc 
US000323 . zxc 
US000323 06Jan2013 czxcxzc 
US000323 07Jan2013 zxcwef 
US000323 08Jan2013 x 
US000323 09Jan2013 dassssd 
US000323 . 322234 
US000323 11Jan2013 sadasd 
US000323 12Jan2013 1213 
US000323 13Jan2013 asdsds 
US000323 14Jan2013 zxcxzc 
US000323 15Jan2013 asdad 
US000323 16Jan2013 zxczc 
US000323 11Mar2013 zxcc 
US000323 12Mar2013 zxc 
US000323 13Mar2013 czxcxzc 
US000323 14Mar2013 zxcwef 
US000323 15Mar2013 x 
US000323 16Mar2013 dassssd 
US000323 17Mar2013 322234 
US000323 18Mar2013 sadasd 
US000323 19Mar2013 1213 
US000323 20Mar2013 asdsds 
US000323 21Mar2013 zxcxzc 
US000323 07Oct2013 asdad 
US000323 08Oct2013 zxczc 
US000323 09Oct2013 zxcc 
US000323 10Oct2013 zxc 
US000323 11Oct2013 czxcxzc 
US000323 12Oct2013 zxcwef 
US000323 13Oct2013 x 
US000323 14Oct2013 dassssd 
US000323 15Oct2013 322234 
US000323 16Oct2013 sadasd 
US000323 17Oct2013 1213 
US000323 07Oct2013 asdsds 
US000323 08Oct2013 zxcxzc 
US000323 09Oct2013 asdad 
US000323 10Oct2013 zxczc 
US000323 11Oct2013 zxcc 
US000323 12Oct2013 zxc 
US000323 13Oct2013 czxcxzc 
US000323 14Oct2013 zxcwef 
US000323 15Oct2013 x 
US000323 16Oct2013 dassssd 
US000323 17Oct2013 322234 
US000323 19May2014 sadasd 
US000323 20May2014 1213 
US000323 21May2014 asdsds 
US000323 22May2014 zxcxzc 
US000323 23May2014 asdad 
US000323 24May2014 zxczc 
US000323 25May2014 zxcc 
US000323 26May2014 zxc 
US000323 27May2014 czxcxzc 
US000323 28May2014 zxcwef 
US000323 29May2014 x 
US000328 26Jan2013 dassssd 
US000328 27Jan2013 322234 
US000328 28Jan2013 sadasd 
US000328 . 1213 
US000328 30Jan2013 asdsds 
US000328 31Jan2013 zxcxzc 
US000328 01Feb2013 asdad 
US000328 02Feb2013 zxczc 
US000328 . zxcc 
US000328 04Feb2013 zxc 
US000328 05Feb2013 czxcxzc 
US000328 29Jan2013 zxcwef 
US000328 30Jan2013 x 
US000328 . dassssd 
US000328 01Feb2013 322234 
US000328 02Feb2013 sadasd 
US000328 03Feb2013 1213 
US000328 04Feb2013 asdsds 
US000328 . zxcxzc 
US000328 06Feb2013 asdad 
US000328 07Feb2013 zxczc 
US000328 08Feb2013 zxcc 
US000328 . zxc 
US000328 13May2013 czxcxzc 
US000328 14May2013 zxcwef 
US000328 15May2013 x 
US000328 16May2013 dassssd 
US000328 . 322234 
US000328 18May2013 sadasd 
US000328 19May2013 1213 
US000328 20May2013 asdsds 
US000328 21May2013 zxcxzc 
US000328 . asdad 
US000328 12May2013 zxczc 
US000328 13May2013 zxcc 
US000328 14May2013 zxc 
US000328 . czxcxzc 
US000328 16May2013 zxcwef 
US000328 17May2013 x 
US000328 18May2013 dassssd 
US000328 19May2013 322234 
US000328 20May2013 sadasd 
US000328 21May2013 1213 
US000328 22May2013 asdsds 
US000328 28Aug2013 zxcxzc 
US000328 29Aug2013 asdad 
US000328 . zxczc 
US000328 31Aug2013 zxcc 
US000328 01Sep2013 zxc 
US000328 02Sep2013 czxcxzc 
US000328 03Sep2013 zxcwef 
US000328 04Sep2013 x 
US000328 . dassssd 
US000328 06Sep2013 322234 
US000328 07Sep2013 sadasd 
US000328 13Jul2014 1213 
US000328 14Jul2014 asdsds 
US000328 15Jul2014 zxcxzc 
US000328 16Jul2014 asdad 
US000328 17Jul2014 zxczc 
US000328 18Jul2014 zxcc 
US000328 19Jul2014 zxc 
US000328 20Jul2014 czxcxzc 
US000328 21Jul2014 zxcwef 
US000328 . sdsfsfqeww 
US000328 23Jul2014 zxcc 
US000328 20Sep2014 zxc 
US000328 21Sep2014 czxcxzc 
US000328 22Sep2014 zxcwef 
US000328 23Sep2014 x 
US000328 24Sep2014 dassssd 
US000328 . 322234 
US000328 26Sep2014 sadasd 
US000328 27Sep2014 1213 
US000328 28Sep2014 asdsds 
US000328 29Sep2014 zxcxzc 
US000328 30Sep2014 asdad 
US000328 . zxczc 
US000328 11Feb2015 zxcc 
US000328 12Feb2015 zxc 
US000328 . czxcxzc 
US000328 14Feb2015 zxcwef 
US000328 15Feb2015 x 
US000328 16Feb2015 dassssd 
US000328 17Feb2015 322234 
US000328 18Feb2015 sadasd 
US000328 19Feb2015 1213 
US000328 . asdsds 
US000328 16May2015 zxcxzc 
US000328 17May2015 asdad 
US000328 18May2015 zxczc 
US000328 19May2015 zxcc 
US000328 20May2015 zxc 
US000328 21May2015 czxcxzc 
US000328 22May2015 zxcwef 
US000328 . x 
US000328 24May2015 dassssd 
US000328 25May2015 322234 
US000328 26May2015 sadasd 
US000328 19Jun2015 1213 
US000328 20Jun2015 asdsds 
US000328 21Jun2015 zxcxzc 
US000328 22Jun2015 asdad 
US000328 23Jun2015 zxczc 
US000328 24Jun2015 zxcc 
US000328 25Jun2015 zxc 
US000328 26Jun2015 czxcxzc 
US000328 . zxcwef 
US000328 28Jun2015 x 
US000328 29Jun2015 dassssd 
US000328 08Jul2015 322234 
US000328 . sadasd 
US000328 10Jul2015 1213 
US000328 11Jul2015 asdsds 
US000328 12Jul2015 zxcxzc 
US000328 . asdad 
US000328 14Jul2015 zxczc 
US000328 15Jul2015 zxcc 
US000328 16Jul2015 zxc 
US000328 17Jul2015 czxcxzc 
US000328 . zxcwef 
; 

我要的是：

1. 其中t1.Event = 「緯度」 和t1.Mach = t2.Mach和t1.Date = t2.Date

2. 獲得從T2這是最接近的前一後立即（該日期時t1.Date = t2.Date如上面1）所述。如果日期在t2爲空白，則在匹配日期之後選擇第二個前一個或第二個。 （請參閱下面的註釋）。

3. 結合T1和T2到T3這樣的結果看起來像是如下：

樣品T3：

MACH EVENT DATE TIME PMACH PXMACH SITE RAD MILVAL SF DATA 
US0001 . 01Jan2013 .  .  .  .  . .  . asdsds 
US0001 Lat 02Jan2013 19:24 .  .  .  876 2660403 1 . 
US0001 . 03Jan2013 .  .  .  .  . .  . asdad 
US0001 . 07Jan2013 .  .  .  .  . .  . czxcxzc 
US0001 Lat 12Jan2015 7:00  .  .  .  . 2900334 1 . 
US0001 . 24May2013 .  .  .  .  . .  . zxcwef 
US000323 . 12Oct2012 .  .  .  .  . .  . zxc 
US000323 Lat 13Oct2012 19:37 .  .  .  852.2 1332753 1 . 
US000323 . 15Oct2012 .  .  .  .  . .  . . x 

注：爲US000323 13Oct2012後在T1，從t2中選擇的日期是15Oct2012，這是t2中的第二個下一個日期，因爲緊接着t1.Date = t2.Date（= 130ct2016）在t2中是空白日期，所以我們不選擇那個，而是選擇第二個下一個日期是15Oct2016。

Answer 1

OK，有了一個開始，這裏是＃1中的代碼：

proc sql noprint; 
    create table work.temp as 
    select t1.MACH, t1.EVENT, t1.DATE, t1.TIME, t1.PMACH, t1.PXMACH, t1.SITE, t1.RAD, t1.MILVAL, t1.SF, 
    t2.Data from 
    sample1 t1, 
    sample2 t2 

    Where t1.EVENT = "Lat" and t1.MACH = t2.MACH and t1.DATE = t2.Date; 
quit; 

下行，這會產生只有一條記錄：

US0001 Lat 02Jan2013 19:24 .  .  .  876 2660403 1 . 

我不知道如何從這個跳導致您的示例輸出，它實際上不包括此記錄。似乎邏輯步驟與結果集不匹配。

我想你可能想先做第2步，然後在＃1比較？這可能會讓我們更接近。讓我知道如果是這樣的話，我可以試試這種方式。