?Describe the use of joins in in XQuery, and differentiate between an inner join and outer join. Which is the default join type in XQuery?
What will be an ideal response?
?A join is a database operation used to combine two or more database tables based on fields or columns that are common to the tables. The default join type is the inner join, in which only those records that contain matching values between the tables are included in the query result.?An outer join takes all of the records from one table and then matches those records to values in the other tables if possible. If no matching value is present, the record from the first table is still part of the query result but displays missing values for any data from the other tables.?The default in XQuery is to create inner joins, but you can create an outer join by nesting one FLWOR structure within another. The outer FLWOR structure iterates through all of the records in the first table, displaying all of the records, while the inner FLWOR structure iterates through all of the records in the other tables, returning missing values if no matching record is found.
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