An INTERSECT operation retrieves the matching set of distinct values (not rows) from two columns. The INTERSECT ALL returns the set of matching individual rows. An INTERSECT and/or EXCEPT operation is done by matching ALL of the columns in the top and bottom result sets. In other words, these are rows, not the column, operations. […]
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A UNION operation combines two sets of columns and removes duplicates. The UNION ALL expression does the same but does not remove the duplicates. When DB2 encounters the keyword, it processes each select / sub-select to form an interim result table, then it combines the interim result table and deletes duplicate rows to form a
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COALESCE DB2 function is used to handle the NULL values that might be present in the data or a list of values that are specified. If the NOT NULL constraint on the column is not applied, then the default value that gets inserted in those columns when not specified is the NULL value. It returns the
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