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The precision of the values returned by the AVG function depends on the column s data type, whether decimals are used, and how the SQL implementation averages numbers. For example, the exact average for the Joni Mitchell row is 39.5, but because the NUMBER_SOLD column is configured with an INT data type, only whole numbers are used. For some implementations, the .5 is dropped and not rounded up, as shown in my latest sample query results.
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Value functions are a type of function that allow you to return a value that in some way calculates or derives information from the data stored within your tables or from the SQL implementation itself. Value functions are similar to set functions in the sense that they
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perform some sort of behind-the-scenes action to arrive at that value. However, value functions are different from set functions in that they do not require that data be grouped together. SQL supports a number of value functions. Which functions are supported in which SQL implementations can vary widely. In addition, the meaning of a function name can sometimes vary from one implementation to the next. Still, there are some consistencies among the various implementations, and those are the value functions on which I focus. The value functions that I discuss fall into two categories: string value functions and datetime value functions. In order to illustrate how these functions work, I use the SALES_ DATES table, shown in Figure 10-2.
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A string value function allows you to manipulate character string data to produce a precise value that is based on the original character string. When using a string value function, you must supply the character string as a parameter of the function. That parameter is then converted to a new value according to the purpose of that function and any other parameters that might be specified. In this section, I introduce you to three string value functions: SUBSTRING, UPPER, and LOWER.
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The SUBSTRING string value function extracts a defined number of characters from an identified character string in order to create a new string. That original character string can be derived from a column or can be explicitly stated. In both cases, the character string is
COMPACT_DISC: VARCHAR(60) Famous Blue Raincoat Blue Court and Spark Past Light That Christmas Feeling Patsy Cline: 12 Greatest Hits Out of Africa Leonard Cohen The Best of Fundamental Blues on the Bayou
DATE_SOLD: TIMESTAMP 2002-12-22 10:58:05.120 2002-12-22 12:02:05.033 2002-12-22 16:15:22.930 2002-12-23 11:29:14.223 2002-12-23 13:32:45.547 2002-12-23 15:51:15.730 2002-12-23 17:01:32.270 2002-12-24 10:46:35.123 2002-12-24 12:19:13.843 2002-12-24 14:15:09.673
Figure 10-2
Using value functions on the SALES_DATES table
SQL: A Beginner s Guide
passed as a parameter of the SUBSTRING function, along with a start point and, optionally, a length specification. For example, suppose you want to return only the first 10 characters of the values in the COMPACT_DISC column in the SALES_DATES table. You can create a SELECT statement similar to the following:
SELECT SUBSTRING(COMPACT_DISC FROM 1 FOR 10) AS SHORT_NAME FROM SALES_DATES;
The SUBSTRING function includes three parameters. The first is the name of the column, COMPACT_DISC, which identifies the source used for the character string. The next parameter, FROM 1, indicates that the function will start counting at the first character. The third parameter, 10, follows the FOR keyword. The FOR 10 parameter, which is optional, indicates that up to 10 characters will be included in the new character string.
NOTE
Most implementations, including SQL Server, MySQL, and Oracle, do not use the keywords FROM and FOR you simply separate the parameters using commas. Also, in Oracle, the function is named SUBSTR. Here is the same statement modified for Oracle: SELECT SUBSTR(COMPACT_DISC, 1, 10) AS SHORT_NAME FROM SALES_DATES; If you execute this SELECT statement, you ll receive the following query results: SHORT_NAME ---------Famous Blu Blue Court and Past Light That Chris Patsy Clin Out of Afr Leonard Co Fundamenta Blues on t Notice that only the first 10 characters of each COMPACT_DISC value are included in the results. For those values less than 10 characters, the full name appears.
The FROM parameter can accept a negative number or a zero as a parameter, assuming your SQL implementation allows it. When using a negative number or a zero, keep in mind that 1 represents what you would think of as a normal starting position. The next character to the left of 1 is 0. The character to the left of 0 is 1, and so on. The FOR parameter counts characters starting at the starting point. If a zero or a negative number is used, the SUBSTRING function
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