Microsoft Access 2010 VBA Macro Programming in Microsoft Office

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CHAPTER
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QL queries do not form part of the VBA language but it is very important to understand how they work and what they can do
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Microsoft Access 2010 VBA Macro Programming
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Using the Query Design Window
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Queries can be easily constructed in Access by using the Query Design window This provides a GUI that allows the user to easily build a query on several tables To use the Query Design window, click Create in the Access menu and then click the Query Design icon in the Macros & Code group of the ribbon You will then see the window shown in Figure 12-1 In the pop-up window called Show Table, click the tables and queries you want to use and then click the Add button Click the Close button when complete You can return to this window to add more tables or queries by right-clicking in the Query Design window and clicking Show Table Select the Customers and the Orders tables only The tables you have selected will be shown graphically in the Query Design window, listing all the fields available in each table You can drag the tables around the window to reposition them for easy viewing Access will also try to link the tables together for you, although this does not always work Do not rely on Access to do this for you since it can be wrong sometimes
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Figure 12-1
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The Query Design window on opening
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12: SQL Queries
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The Query Design window showing the Customers and Orders tables
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In the example shown in Figure 12-2, the Customers and the Orders tables have been selected Notice that Access automatically makes a join between the ID field in the Customers table and the Customer ID field in the Orders table This is correct in joining the two tables Access has been doing a bit of thinking for us, which can be annoying sometimes, and has surmised that there is a one-to-many relationship between customers and orders In other words, one customer can have many orders, and this is illustrated graphically by the 1 and 00 symbols on the join line If you want to join using other fields, you can right-click the join line and select Delete You can then select a field for joining in one table and drag it to the field you wish to join to in the other table This will create a new join line on the GUI You can have more than one join connecting two tables and have many different tables within one query, although this does affect the query performance The result is a spider s web that can be quite difficult to debug should there be anything wrong with it Because of this, Access has decided that this should be a right join so all orders are shown regardless of whether there is a corresponding customer This is illustrated graphically by the small arrow on the left end of the join line
Microsoft Access 2010 VBA Macro Programming
Figure 12-3
The Join Properties window in the Query Design window
Place your cursor anywhere on the join line, right-click, and then select Join Properties A window like that in Figure 12-3 will appear This provides options in which you can make a straight join (where the joined fields are equal) or a left or right join where all the records are retrieved from one of the tables (but only the records from the other table where the joined fields are equal) In this particular case, where a right join has been made all orders will be shown, matching to customers where possible For the query to work, you need to add some fields into the results section of the window You can either double-click the field name or drag it down to the Field row of the results area You can also use the drop-downs for Field and Table in the results area Add in the fields Company, Order Date, and Ship Name in this way You can also enter criteria in the Criteria row For example, under Order Date, enter >#01/01/2006# Your Query Design window should now look like Figure 12-4 Notice that your date criterion has a hash sign (#) at the start and end to designate it as a date It is entered according to the locale that Windows is set to, so in North America you would use the mm/dd/yyyy format, otherwise the dd/mm/yyyy format
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