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What kind of operations (+, -, etc) we can do on recordset?

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You can do all types of set operations and also conditional operations.

record in recset1           # include
record not in recset1 # not include
recset1 + recset2 # extend
recset1 | recset2 # union
recset1 & recset2 # intersect
recset1 - recset2 # difference
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