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The HAVING clause always comes after a GROUP BY clause. It selects rows matching some condition (in this case, COUNT(*) >= 3) from the result of the grouping. It is like having a WHERE clause that acts on the aggregated numbers. As a little aside, we must use COUNT(*) in the HAVING clause; we can t use the alias NumEntries from the first line of the statement. This alias is just used at the end of the query to label the output column. Let s look at another example. Say we want to find those members who have entered four or more tournaments. First, construct a set of rows with the members and the counts of the tournaments they have entered, as in the first three lines of Listing 8-25. Then use the HAVING clause to select just those rows from the result with COUNT(*) >= 4.

Note Slowly but surely, wi-fi is replacing wired Ethernet networks. However, sometimes wi-fi networks are impractical or simply undesirable. For example, the metal infrastructure in some buildings means the signal becomes unreliable. Wi-fi is also considered too insecure for some companies, as the wi-fi signal often spreads to the street outside the building. Although such transmissions are nearly always secured and WPA2 is considered secure, wi-fi security implementations have been broken. Ethernet might be considered old technology, but trying to steal data from physical cables is an order of magnitude more difficult, to the point of being practically impossible.

Notebooks and PDAs typically use built-in wireless network devices, with an invisible antenna built into the case. However, some older notebooks might use PCMCIA cards, which have an external square antenna, and some desktop computers might use PCI-based wireless cards or USB dongles, which have external rubber/plastic antennas, in the style of old cell phones. Ubuntu includes support for most wireless network devices. However, it s possible to use Windows wireless network device drivers for unsupported hardware. Also, sometimes Ubuntu appears to support a wireless network device, in that it identifies it and lets you configure it, but you might find that it simply doesn t work (or works very badly, perhaps with an intermittent connection). In this situation, you can also try installing Windows drivers. See the Installing Windows Wireless Network Device Drivers section later in this chapter for details.

case "$1" in start) log_action_begin_msg "Configuring network interfaces" type usplash_write >/dev/null 2>/dev/null && usplash_write "TIMEOUT 120" || true if [ "$VERBOSE" != no ]; then if ifup -a; then networking The last and possibly the most frequently used method to run a script is to make it an executable first. Do this by adding the execute permission to your script, as in the following command: chmod +x hello

Note Ubuntu is rare in the Linux world in that it uses some proprietary (closed source) wireless device drivers by default. Ubuntu is, after all, an open source OS and is committed to the goals of free and open source software. The use of proprietary drivers is considered a necessary evil because not all devices have open source drivers right now, and not all open source drivers support all the functions you might be used to (typically, they might not support the WPA functionality of your wi-fi device, for example). The use of proprietary drivers is regarded as a stopgap measure, and it s hoped that manufacturers will realize that it is in their interests to support open source driver development, making proprietary drivers redundant.

Listing 8-25. Find Members Who Have Entered More Than Four Tournaments SELECT MemberID, COUNT(*) AS NumEntries FROM Entry GROUP BY MemberID HAVING COUNT(*) >= 4

Connecting to a wireless network device is easy with NetworkManager. Just click the NetworkManager icon, and you will see the available wi-fi networks in the Wireless Network list. Networks protected with WEP/WPA have a padlock in the wireless icon to the right of the name, as shown in Figure 7-5. Those that are open don t have this padlock.

Next, you can simply run the script: ./hello Notice that, in this example, the script is executed as ./hello and not just hello (assuming the script is in the current directory). This is because you need to indicate that the script must run from the current directory. As a default security feature, no Linux shell looks for executable code in the current directory. Excluding the current directory from the search path ensures that a user or an administrator who runs a command always runs the proper command from the search path and not some rogue command that was installed in the current directory. Without the ./, Bash would search for hello in its current PATH setting and would probably not find it.