When are two sets of columns union compatible?
What will be an ideal response?
Two sets of columns are union compatible if they contain the same number of columns, and if the data types of the columns in one set match the data types of the columns in the other set. In other words, the first column in one set has a compatible data type with the data type of the first column in the other set, the second column in one set has a compatible data type with the data type of the second column in the other set, and so on.
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