Kas saaksite selgitada täisliitmise (FULL JOIN) täitmise mehhanismi SQL-is?

FULL JOIN (or FULL OUTER JOIN) in SQL combines rows from two tables, returning all records from both tables. If a row from one table has no match in the other, the missing columns will have NULL values in the result set.

Example:

SELECT * FROM tableA
FULL JOIN tableB ON tableA.id = tableB.id;

This will return all rows from tableA and tableB, joined according to the condition, and if there is no match, the corresponding fields will be NULL.

FULL JOIN is useful when you want to obtain a complete dataset from both tables, including unmatched records.