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An eight-character string that contains any first two characters followed by exactly two zeros and then any four digits A string that contains any character other than a number or the letter B, M, or Q in the first position and ends with exactly four digits

This is also an interesting example of what should be avoided! The code that uses the join clause and not our Books operator will be more efficient in most cases because it uses the GroupJoin operator behind the scenes. GroupJoin is optimized to join sequences, and in our case it will loop on books only once to find their publisher. The version of the code that uses our Books operator will loop on the collection of books for each publisher. This example should help you to understand that while it s easy to create new query operators, it s not always the most efficient option. The choice is yours. Always consider the implications.

LIKE 00#### LIKE [!0-9BMQ]*####

* Character string comparisons in Microsoft Access are case-insensitive. So, smith, SMITH, and Smith are all equal.

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To assist you in entering formatted data, Access allows you to define an input mask for Text, Number (except Replication ID), Date/Time, and Currency data types. You can use an input mask to do something as simple as forcing all letters entered to be uppercase or as complex as adding parentheses and hyphens to phone numbers. You create an input mask by using the special mask definition characters shown in Table 4-6. You can also embed strings of characters that you want displayed for formatting or stored in the data field.

Before we move on to other kinds of extensibility, let s consider one more example of a domain-specific query operator.

Table 4-6.

A single digit must be entered in this position. A digit or a space can be entered in this position. If the user skips this position by moving the cursor past the position without entering anything, Access stores nothing in this position. A digit, a space, or a plus or minus sign can be entered in this position. If the user skips this position by moving the cursor past the position without entering anything, Access stores a space. A letter must be entered in this position. A letter can be entered in this position. If the user skips this position by moving the cursor past the position without entering anything, Access stores nothing. A letter or a digit must be entered in this position. A letter or a digit can be entered in this position. If the user skips this position by moving the cursor past the position without entering anything, Access stores nothing. A character or a space must be entered in this position. Any character or a space can be entered in this position. If the user skips this position by moving the cursor past the position without entering anything, Access stores nothing.

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When you run the query, you see the recordset shown in Figure 8-2. The fields from the tblFacilities table appear first, left to right. I resized the columns displayed in Figure 8-2 so 280

Book.IsExpensive The last operator in this section will show you how query operators can be used to code a specific concept only once. The sample operator in listing 12.6 takes a book as a parameter and returns whether or not it is expensive.

Building Complex Queries that you can see all the fields. You might need to scroll right in the datasheet to see them on your machine.

A query is really defined by its SQL The query designer converts everything you build in a query grid into SQL the lingua franca of database queries. Access actually stores only the SQL and rebuilds the query grid each time you open a query in Design view. Later in this chapter, we ll examine some of the actual syntax behind your queries, and you can study the full details of SQL in Article 1, Understanding SQL, on the companion CD.

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