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Subsequent characters can be letters, numbers, underscore, or a dollar sign ($) Must be 63 or fewer characters long Case sensitive The last rule is often what gets novice database administrators in trouble This means that you can have a table named Customer as well as another table named customer in the same schema This is almost always a recipe for disaster when running SQL statements, and should be avoided if at all possible For this exercise, we will capitalize the first character in the table names and make the rest lowercase When creating this new table, use the name Customer As with the other database objects, you must define the owner of the table Again, we will use the postgres user for this exercise When creating a new table, you must specify the tablespace where the table will be stored You may store tables in different tablespaces within the same database if you desire For this exercise, you should just use the pg_default tablespace The Has OIDs check box indicates whether PostgreSQL will assign an object ID (OID) to the newly created table By default, PostgreSQL does not assign an OID to user-created tables If you plan on using the PostgreSQL inheritance feature (discussed in 1), you must assign an OID to the table Since our tables will not use this feature, we can leave this check box unchecked The Inherits from Tables section allows you to specify whether the newly created table will inherit any columns (fields) from parent tables The parent table must have an OID assigned to it Again, since none of our tables will do this, we will leave this section blank Finally, the Comment section allows us to place a comment in the table that can be seen from pgAdmin III when we view the properties of the table This is extremely handy when designing a large system with lots of tables After filling in the required information in the Properties tab, click the OK button to create the table The new table appears under the Tables list in the new schema You have created a new table, but there is no data defined within the table We will do that shortly Before entering new data, look at the table objects created with the new table Expand the new Customer table object that was created in the new schema Each table consists of five categories of objects: Columns Hold data elements in the table Constraints Add further restrictions on data in the columns Indexes Speed up data searching in the table Rules Define functions performed on data in other tables based on events Triggers Define functions performed on data in the table based on events The next step to complete your table is to define columns for the data Each column defines a data element that will be stored in the table Each column must be declared as.

measured in dots per inch (dpi) The dpi qualifier refers to the number of dots per linear inch in a scanned image, horizontally or vertically That is, a 2400-dpi scanner, like the one in Figure 3-5, is capable of storing an image

or paint thinner, clean the flux from the bottom of the board and allow it to dry Figure 1-8 is a photograph of the completed adapter Because the photo in Figure 1-8 is not in color, you can t see that I have painted the tops of the header to remind myself of the function of each pin (To identify the colors I used, I have added a single-letter label to each pin) I used small jars of Testors model paints and a small detail brush from the local hobby shop for this purpose Stripboard headers tend to be difficult to

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The schematic for the Hello World! project is presented in Figure 1-9 Note the 330 current-

Figure 3-5

1

(Photo courtesy of Hewlett-Packard Company)

Next, do the same for the Accountant Group Role, assigning them only SELECT privileges for the table When you have finished, do the same for the Product table, assigning INSERT, SELECT, UPDATE, and DELETE privileges for the Accountant role, and only SELECT privileges for the Salesman role Finally, assign privileges for the Order table, giving both the Salesman and Accountant roles INSERT, SELECT, UPDATE, and DELETE privileges Now that you have all of the table privileges created, you might think that you are done Unfortunately that is not the case There is one more privilege you need to address As a security feature, a newly created schema does not grant any privileges to any groups (not even the public group) Only the superuser (postgres by default) has privileges to modify the schema By default, pgAdmin III does not show individual user privileges in the listing until after you add group privileges, so you will not see the postgres user privileges displayed You must specify if your new Group Roles should have access to the store schema Double-click the store schema in pgAdmin III, then

Figure 1-9

with 5,760,000 (2400 times 2400) dots per square inch The typical home scanner will have this photographic quality resolution, or res Maximum color depth One of the scanner specs is the number of bits associated with each dot, its color depth The color depth of the scanner in Figure 3-5 is 48 bits That means that the scanner can detect and code many millions of colors for each dot (248 or a lot of colors) I seldom scan at this color depth, though, because there is a trade-off between the color depth being used and the size of the scanned image Huge images are cumbersome to work with and take up storage space You can opt to scan at much lower color depths with relatively little loss in image quality, especially if your plans are to view images via a monitor Maximum scan area The typical area will be slightly larger than a standard sheet of letter paper (85 11) You can get a scanner with a larger scan area, but you pay for it and you probably won t need it Most scanners are sold with a variety of support software, including the basic scan software, OCR software for interpreting text, and imaging software that allows you to digitally modify images with special effects The scanning function is built into all-in-one multifunction devices, which are introduced in the next chapter on output

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