SELECT "zPaleartic_Birds"."PA_ID", "zPaleartic_Sightings"."Bird_Name", "zPaleartic_Field_Trips"."Date", "zPaleartic_Locations"."LocationName", "zPaleartic_Locations"."Country"įROM "zPaleartic_Field_Trips", "zPaleartic_Locations", "zPaleartic_Sightings", "zPaleartic_Birds" Shift to SQL view by clicking the Switch Design View On/Off button on the toolbar.If you are going to use the View in a grouping query, make sure not to specify a sort order. Create a new Query in Design view, and set up the fields you want to use.Those who are very familiar with SQL can create these SELECT statements "from scratch," but for the rest of us, it is easier to use the Query Design view to create our SELECT statements for us. a text field and a date field cannot be parallel fields.) The parallel fields must be of the same or very similar type.The parallel fields must be in the same order in both statements.Each statement must include the same number of fields.The field names in the two statements do not have to have to be the same, but the following rules must be followed: In our case, one SELECT statement will select data about birds seen in the AOU birding area and the other will select data about birds seen in the paleartic birding area. A UNION command will let us do that.Ī UNION statement consists of two SELECT statements (the Query designer lets you build a SELECT statement without knowing SQL) joined by the UNION command. We'd still like to see a life list including birds from both the AOU and Paleartic lists.
So we create a new set of tables and forms in the same database file but specifically designed to track paleartic birds. Not all of those birds will be on the AOU birdlist, which lists birds in North America. In our example, say we take a visit to Europe or northern Asia and go birdwatching there. A school for example, might have separate tables for students and faculty, but might want to combine the records from these tables to make a phone directory. But you can also use the UNION statement to combine records for unrelated Tables or Queries. The example above uses the same Tables on either side of the UNION statement. Save the View by clicking on the Save button on the toolbar.Verify that the query/view ran correctly.Click on the Run Query button on the toolbar (the double datasource icon with a green arrow pointing down).Click on the Run SQL command directly button on the toolbar (the single datasource icon with a green arrow pointing down).and you will see and SQL statement that looks something like this: Click on the Switch Design View On/Off button on the toolbar (the datasources icon with a blue drafting triangle on it).In the first Or row under Juvenile, type TRUE.In the Criterion row under Female, type TRUE.
#MYSQL CREATE VIEW WITH UNION HOW TO#
See Using a Query to Combine Fields From Different Tables if you are not sure how to do this. Add the following fields to the View designer table at the bottom of the View Design window.In the Add Table or Query window, click add the following tables by selecting them and clicking on the Add button.In the main Database window, click on the Tables icon in the left column.Note that with SQL direct mode chosen, it is not possible to return to the View Design mode.
While someone familiar with SQL can build the entire View in SQL view, we will build the initial part of the View by using the View designer, and then shift to SQL view and SQL direct mode. Furthermore, if we wanted to group these results by Species, we would have to do it this way, as a grouping query based on a query containing multiple OR statements will cause NeoOffice to hang. Due to an known issue with multiple OR statements, our "query" will run faster if we use a View and a UNION command. Suppose we want to find all sightings where a female or a juvenile has been identified. Using UNION to Allow for Multiple OR Statements
0 kommentar(er)
