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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.
- Table Aliases
Table Aliases - Db2 LEFT JOIN Clause by Practical Examples -...
- Db2 DEFAULT Constraint
Db2 applies the default constraints when new rows are...
- Foreign Key
You can use the foreign key constraint to define foreign...
- Common Table Expression Or CTE
In this example, we referenced the common table expression...
- Coalesce
In this example, if the value in the isbn column is NULL,...
- Unique
Db2 UNIQUE constraints ensure that the values in a column...
- In
1) Using Db2 IN operator with a list of numeric values. This...
- Identity Columns
Notice that a table can have one and only one identity...
- 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 LEFT OUTER JOIN clause lists rows from the left table even if there are no matching rows on right table. As in an inner join, the join condition of a left outer join can be any simple or compound search condition that does not contain a subquery reference. Example.
Left outer join A left outer join returns all the rows that an inner join returns plus one row for each of the other rows in the first table that do not have a match in the 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.
The JOIN operation allows you to combine rows from two or more tables based on a related column. OUTER JOIN includes the FULL, RIGHT, and LEFT OUTER JOINS. When two tables are joined there can be NULL values from either table. For INNER JOINs, records with nulls won’t match, and they will be discarded and won’t appear in the result set.
