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The ROUND function allows you to round a number to a given precision. The ROUND function is used frequently to display only the number of decimal places required in the report or application. The ROUND function requires two parameters, the number and the length, which can be either positive or negative. It also has an optional third parameter that causes the function to just truncate instead of rounding if a nonzero value is supplied. Here is the syntax: ROUND(<number>,<length>[,<function>]) Type in and execute the code in Listing 3-21 to learn how to use ROUND. Listing 3-21. Using ROUND SELECT ROUND(1234.1294,2) AS "2 places on the right", ROUND(1234.1294,-2) AS "2 places on the left", ROUND(1234.1294,2,1) AS "Truncate 2", ROUND(1234.1294,-2,1) AS "Truncate -2"; You can view the results in Figure 3-21. When the expression contains a negative number as the second parameter, the function rounds on the left side of the decimal point. Notice the difference when 1 is used as the third parameter, causing the function to truncate instead of rounding. When rounding 1234.1294, the expression returns 1234.1300. When truncating 1234.1294, the expression returns 1234.1200. It doesn t round the value; it just changes the specified digits to zero.

network board (a multi-homed server), so that it can serve all the networks it s connected to. An alternative is to use a DHCP relay agent, which is a service that forwards packets to the DHCP server. You can run it on any server on the network or on a router. Almost every hardware router has embedded functionality that lets it act as a DHCP relay agent. If you want to install a relay agent on a Linux server, you need the dhcp-relay package; use apt-get install dhcp-relay to install it. After its installation, you can configure the relay agent from the /etc/default/dhcp-relay file in which you ll find the INTERFACES parameter. Use this to specify on which network cards the relay agents should listen for DHCP broadcasts. You can configure it to listen on eth0 and eth1 by adding INTERFACES="eth0 eth1" to the dhcp-relay file. Next, you need to specify the IP address of the DHCP server. To do this, add it as a parameter to the DHCP_SERVERS parameter. After configuring these options, use /etc/init.d/ dhcrelay start to start the relay agent.

RAND returns a float value between 0 and 1. RAND can be used to generate a random value. This might be used to generate data for testing an application, for example. The RAND function takes one optional integer parameter, @seed. When the RAND expression contains the seed value, the function returns the same value each time. If the expression does not contain a seed value, SQL Server randomly assigns a seed, effectively providing a random number. Type in and execute the code in Listing 3-22 to generate a random numbers. Listing 3-22. Using RAND SELECT CAST(RAND() * 100 AS INT) + 1 AS "1 to 100", CAST(RAND()* 1000 AS INT) + 900 AS "900 to 1900", CAST(RAND() * 5 AS INT)+ 1 AS "1 to 5"; Since the function returns a float value, multiply by the size of the range, and add the lower limit (see Figure 3-22). The first expression returns random numbers between 1 and 100. The second expression returns random numbers between 900 and 1900. The third expression returns random values between 1 and 5.

For many networked applications, knowing the correct time is essential for proper operation. On the Internet, the network time protocol (NTP) is the de facto standard for time synchronization. In this section, you ll learn how to configure your server as an NTP time server as well as an NTP client. I ll cover the following subjects: The working of NTP Configuring a stand-alone NTP time server Configure your server to fetch its time from a time reference source Tuning NTP operation

The Spring HTTP invoker client establishes an HTTP connection to the remote server, transmits the encoded service call, and awaits a response from the server. The client creates a proxy object to represent the remote service that implements the supplied interface