barcode generator java source code free 3: Forms-based Database Queries in Software

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3: Forms-based Database Queries
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Figure 3-11 Design View (Employees table)
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Creating Queries in Microsoft Access
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As mentioned, Microsoft Access queries closely resemble what most DBMSs call views, because a view is defined in the SQL standard as a stored database query A key similarity is that Access queries, like views, do not store any data; instead, the data is stored in the tables However, Access queries have some capabilities not found in views, such as the ability to tailor a query to perform inserts to or updates of data rows in the database On the Navigation Pane, expanding the Queries category lists all the queries stored in this database, as shown in Figure 3-12 Although Microsoft Access offers several ways to create a new query, the Query Design option is the easiest for beginners to understand When you click the Query Design icon (in the Other area of the Create ribbon), Access displays the Show Table dialog box, as shown in Figure 3-13
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Figure 3-12 Northwind database Queries listing
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For every new query, Access opens the Show Table dialog box to allow you to select the tables and/or queries on which the query will be based (that is, the tables or queries that are to be the source of the data that will be displayed) As tables and queries are added, they appear on the Query Design panel, which allows for the entry of the specification for the desired query Figure 3-14 shows the Query Design panel with the Customers table added The Query Design panel has the following components:
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In the open area at the top of the panel (light blue background), a graphical representation of the query s source tables, queries, and their relationships for the query are shown Any relationships defined for the tables are automatically inherited here
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Figure 3-13 Show Table dialog box
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3: Forms-based Database Queries
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Figure 3-14 Query Design panel (with Customers table added)
In the grid area in the lower part of the panel, each column represents a column of data that is to be returned in the result set when the query is executed Rows in the grid area define various options to be applied to the corresponding columns Usage examples are provided in the sections that follow:
Field The specification for the source of the column This is normally a table or query column name, but it can also be a constant or an expression similar to calculations used in spreadsheets Table The source table or query name for the column Sort The specification for any sort sequencing for the column (Ascending, Descending, or None) Show A check box that controls display of the column If the box is not checked, the column can be used in forming the query but does not appear in the query results Criteria The specification that determines which rows of data are to appear in the query results All conditions placed on the same line must be met for a row of data to be displayed in the query results Conditions placed on subsequent lines (labeled or on the panel) are alternative sets of conditions that will also cause
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a matching data row to be displayed in the results The usage of these will not likely make sense until you see the examples that follow, but in short, conditions placed on one line are connected with a logical AND operator, and each new line of criteria is connected using a logical OR operator with all the other lines Said another way, any row that matches the specifications that appear on any one of the criteria lines will be displayed in the query results The Criteria entry is the most complicated and thus requires a bit more explanation Conditions are usually written using a comparison operator and one or more data values However, the equal to (=) operator may be omitted For example, if you want to select only rows in which a column value is equal to 0, you can enter =0 or just 0 Character values are enclosed in either single or double quotes, but if you leave them out, Access will assume they are there based on the data type of the column For example, if you want to select only rows containing a column value of M, you can enter the condition in any of the following ways: M, M , M , =M, = M , or = M When you enter dates, you might notice that Access delimits date values using the pound sign (#), but you need not worry about doing so yourself As you might guess, you can use other comparison operations in addition to equal to (=) The following table shows all the supported comparison operators: Operator
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