SAS question: I have 50 fils a1,a2,...,a50. the primary key is upc. then if i want to merge all 50 files, the code is as follows, data test; merge a1 ... a50; by upc; run; we know that writing all 50 files name is time consuming, is there any standard format of this code?
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why and how current drawn by battery charger depends upon the altitude where it is located?
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I created 3 actions in test suppose I want to run action 1 in single time, action 2 is 4 time what I do?
Maximum cement content in 1cum for RCC and PSC? (please give IS,IRC referance?
