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Extra info for ActualTests Oracle 1Z0-042 Exam Q and A
After the table is closed, the CUSTOMER table object remains displayed in the Navigation Pane, as shown in Figure AW-1-21. Inserting Data into Tables: The Datasheet View There are three commonly used methods for adding data to a table. First, we can use a table as a datasheet, which is visually similar to and works like a Microsoft Excel worksheet. When we do this, the table is in Datasheet view, and we enter the data cell by cell. Second, we can build a data entry form for the table and then use the form to add data.
This is the reason for using the AutoNumber data type, which automatically assigns a unique number to each row in the table as it is created. Required refers to whether the column must have a data value. If it must, a value must be present in the column. If not, the column may be blank. Note that because CustomerID is a primary key used to identify each row it must have a value. Remarks contains comments about the column or how it is used. For CUSTOMER, the only comment is that CustomerID is a surrogate key.
Select the AutoNumber data type for CustomerID from the Data Type drop-down list, as shown in Figure AW-1-13. (Continued) ■■ 34 Part One Database Fundamentals Figure AW-1-13 Selecting the Data Type The Data Type dropdown list arrow The Data Type dropdown list Select AutoNumber 6. If you like, an optional comment may be stored in the Description column. To do so, move to the Description column by pressing the Tab key or clicking in the Description text box. Type the text Surrogate key for CUSTOMER and then press the Tab key to move to the next row.