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hello can any one explain me these topic plz\
in which scenario we should use join
in which scenario we should use concatenation
in which scenario we should use noconcatenation
thanks in advance
This is a very wide argument, I'll try to do an extreme syntesis:
Join (Left, Right, Inner, Outer) is used when you need to link a table to another table according to one or more fields.
Concatenate is a "Union" of 2 or more tables where rows from the second table are queued to the first table.
No concatenate is uset to keep a set of data (loaded with Load or Select) distincted by another equal set of data previously loaded.