{KEYWORD}) UNION ALL SELECT NULL,NULL
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KEYWORD) UNION ALL SELECT NULL,NULL
In the following example, the INTO clause in the second SELECT statement specifies that the table named ProductResults holds the final result set of the union of the selected columns of the ProductModel and Gloves tables. The Gloves table is created in the first SELECT statement.
Even though you can create a union query by directly writing the SQL syntax in the SQL view, you might find it easier to build it in parts with select queries. You can then copy and paste the SQL parts into a combined union query.
Repeat steps 5 through 10 until you have copied and pasted all of the SQL statements for the select queries into the SQL view window of the union query. Do not delete the semicolon or type anything following the SQL statement for the last select query.
If you're very comfortable writing SQL syntax, you can certainly write your own SQL statement for the union query directly into SQL view. However, you might find it useful to follow the approach of copying and pasting SQL from other query objects. Each query can be much more complicated than the simple select query examples used here. It can be to your advantage to create and test each query carefully before combining them in the union query. If the union query fails to run, you can adjust each query individually until it succeeds and then rebuild your union query with the corrected syntax.
In the example from the previous section using the Northwind database, only data from two tables are combined. However, you can combine three or more tables very easily in a union query. For example, building on the previous example, you might want to also include the names of the employees in the query output. You can accomplish that task by adding a third query and combining with the previous SQL statement with an additional UNION keyword like this:
A common usage for a union query is to serve as the record source for a combo box control on a form. You can use that combo box to select a value to filter the form's records. For example, filtering the employee records by their city.
Now that you have a completed union query displaying each city name only once, along with an option that effectively selects all cities, you can use this query as the record source for a combo box on a form. Using this specific example as a model, you could create a combo box control on a form, set this query as its record source, set the Column Width property of the Filter column to 0 (zero) to hide it visually, and then set the Bound Column property to 1 to indicate the index of the second column. In the Filter property of the form itself, you can then add in code such as the following to activate a form filter using the value of what was selected in the combo box control:
If you join on a column that has repeated values, you'll get many copies of the matching rows in the joined table. For example, there are two blue bricks. The toy Cuteasaurus is blue. So joining the tables on colour returns two copies of the row for Cuteasaurus:select * from toysjoin brickson toy_colour = brick_colour;Note that the keyword inner is optional.
This statement will allow the lookup to display a list of values with one row added to show 'No Subject' null value.(NOTE: We found that you cannot place the @[email protected] keyword in the second select statement for the union, the Lookup will not get registered if you attempt to do so.)
Fragments allow for the reuse of common repeated selections of fields, reducing duplicated text in the document. Inline Fragments can be used directly within a selection to condition upon a type condition when querying against an interface or union.
Field selection is also determined by spreading fragments into one another. The selection set of the target fragment is unioned with the selection set at the level at which the target fragment is referenced. 59ce067264
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