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I need to optimize a multiple concatenate.
The situation is the following:
Table 1: result of concatenation of 3 identical files with 13 fields.
I want to concatenate to Table 1, other 3 identical files that have 12 fields each, mostly different from those in the Table 1.
I tried to concatenate the first 3 identical files, then the other 3 files with each other, and finally the two tables together, but I had to do a re-reading!
You have a better solution?