By C. J. Date
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Extra info for A Guide to Ingres: A User's Guide to the Ingres Product
Sample text
Figure 3-8 Limit Retrieved Cases dialog box To build your criteria, you need at least two expressions and a relation to connect them. E To build an expression, put your cursor in an Expression cell. You can type field names, constants, arithmetic operators, numeric and other functions, and logical variables. Other methods of putting a field into a criteria cell include double-clicking the field in the Fields list, dragging the field from the Fields list, or selecting a field from the drop-down menu that is available in any active Expression cell.
Defining Variables Variable names and labels. The complete database field (column) name is used as the variable label. Unless you modify the variable name, the Database Wizard assigns variable names to each column from the database in one of two ways: If the name of the database field forms a valid, unique variable name, it is used as the variable name. If the name of the database field does not form a valid, unique variable name, a new, unique name is automatically generated. Click any cell to edit the variable name.
To add data sources in distributed analysis mode, see your system administrator. Data sources. A data source consists of two essential pieces of information: the driver that will be used to access the data and the location of the database that you want to access. To specify data sources, you must have the appropriate drivers installed. For local analysis mode, you can install drivers from the CD-ROM for this product: SPSS Data Access Pack. Installs drivers for a variety of database formats. Available on the AutoPlay menu.