Union sub-queries are managed within the Union Panel in the top-right corner of the Query Building Area. Initially there's only one union sub-query labeled with the "Q" letter. All required operations are performed by means of context popup menus.
Union sub-queries can be grouped with other sub-queries and joined with different operators (UNION, UNION ALL, EXCEPT, INTERSECT).
| • | To add a new union sub-query, select the New Union sub-query menu item. |
| • | To enclose the sub-query in brackets, select the Enclose in Brackets menu item. |
| • | To move the sub-query or bracket to the top of the query (the topmost sub-query is the left one), select the Move Left menu item. |
| • | To move the sub-query or bracket to the bottom of the query, select the Move Right menu item. |
| • | To remove the sub-query or bracket, select the Remove menu item. |
| • | To change the union joining operator, select the necessary operator in the list of supported operators in context popup menu.
|
Union Sub-Query operations:
|
Union sub-query operations
|
Operations with brackets:
|
Operations with brackets
|
Select union joining operator
|
Select uniting operator
|
