The explicit Join prefix can be preceded by the prefix outer in order to specify an outer join. In an outer join all combinations between the two tables are generated. The resulting table will thus contain combinations of field values from the raw data tables where the linking field values are represented in one or both tables. The outer keyword is optional.
Syntax:
Outer Join [ (tablename) ](loadstatement |selectstatement )
Arguments:
| Argument | Description |
|---|---|
| tablename | The named table to be compared to the loaded table. |
| loadstatement or selectstatement | The LOAD or SELECT statement for the loaded table. |
Example:
|
Table1 |
|
|
A |
B |
|
1 |
aa |
|
2 |
cc |
|
3 |
ee |
|
Table2 |
|
|
A |
C |
|
1 |
xx |
|
4 |
yy |
SQL SELECT * from table1;
join SQL SELECT * from table2;
OR
SQL SELECT * from table1;
outer join SQL SELECT * from table2;
|
Joined table |
|
|
|
A |
B |
C |
|
1 |
aa |
xx |
|
2 |
cc |
- |
|
3 |
ee |
- |
|
4 |
- |
yy |
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