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The LEFT JOIN clause selects data starting from the left table (T1). It compares each row in the left table with every row in the right table. If two rows match, the LEFT JOIN combines columns of these two rows into a row and includes this row in the final result set.
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- Table Aliases
If you are joining two tables and want the result set to include unmatched rows from only one table, use a LEFT OUTER JOIN clause or a RIGHT OUTER JOIN clause. The matching is based on the join condition.
This tutorial shows you how to use Db2 joins including inner join, left outer join, right outer join, and full outer join to combine rows from two tables.
The inner join determines the last name for any manager identified in the DEPARTMENT table and the left outer join guarantees that each employee is listed even if a corresponding department is not found in DEPARTMENT. The following examples illustrate the use of joins in a subselect query.
The clause LEFT OUTER JOIN includes rows from the table identified before it where the values in the joined columns are not matched by values in the joined columns of the table identified after it. Example 18: Join the tables on the PROD# column to get a table of all products, showing the parts used in that product, if any, and the supplier.
Unlike inner joins, which only return rows that have matching values in both tables, a left outer join returns all rows from the left table (referred to as the “left” or “first” table) and matching rows from the right table (referred to as the “right” or “second” table).
25 sie 2020 · DB2 - SQL LEFT OUTER JOIN. The LEFT JOIN keyword returns all records from the left table (table1), and the matched records from the right table (table2). The result is NULL from the right side, if there is no match.
