Question:Which of the following rules must be followed for combining the result sets of two queries by using UNION? 

A The number of columns must be same in all queries. 
B The order of columns must be same in all queries. 
C The data types of the columns of the queries must be compatible. 
D There should be at least one common column in the tables which are part of the UNION operation. 

+ Answer
A B C 

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Mohammad Towhidul Islam

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