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Arithmetic Operators
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Consider the JOB_HISTORY table, which stores the start date and end date of an employee s term in a previous job role It may be useful for tax or pension purposes to calculate how long an employee worked in that role This information can be obtained using an arithmetic expression Several elements of both the SQL statement and the results returned from Figure 9-5 warrant further discussion The SELECT clause specifies five elements The first four are regular columns of the JOB_HISTORY table, while the latter provides the source information required to calculate the number of days that an employee filled a particular position Consider employee number 176 on the ninth row of output This employee started as a Sales Manager on January 1, 1999, and ended employment on December 31, 1999 Therefore, this employee worked for exactly one year, which, in 1999, consisted of 365 days
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9: Retrieving, Restricting, and Sorting Data Using SQL
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Figure 9-5 Arithmetic expression to calculate number of days worked
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The number of days for which an employee was employed can be calculated by using the fifth element in the SELECT clause, which is an expression This expression demonstrates that arithmetic performed on columns containing date information returns numeric values that represent a certain number of days To enforce operator precedence of the subtraction operation, the subexpression end_date-start_date is enclosed in round brackets Adding 1 makes the result inclusive of the final day TIP As you practice SQL on your test database environment, you may encounter two infamous Oracle errors: ORA-00923: FROM keyword not found where expected and ORA-00942: table or view does not exist These usually indicate spelling or punctuation errors, such as missing enclosing quotes around character literals
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Expression and Column Aliasing
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Figure 9-5 introduced a new concept called column aliasing Notice that the expression has a meaningful heading named Days Employed This heading is an alias An alias is
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an alternate name for a column or an expression If this expression did not make use of an alias, the column heading would be (END_DATE-START_DATE)+1, which is not very user friendly Aliases are especially useful with expressions or calculations and may be implemented in several ways There are a few rules governing the use of column aliases in SELECT statements The alias Days Employed in Figure 9-5 was specified by leaving a space and entering the alias in double quotation marks These quotation marks are necessary for two reasons First, this alias is made up of more than one word Second, case preservation of an alias is only possible if the alias is double quoted If a multiworded space-separated alias is specified, an ORA-00923: FROM keyword not found where expected error is returned if it is not double quoted SQL offers a more formalized way of inserting aliases by inserting the AS keyword between the column or expression and the alias as shown in the first line of this query:
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SELECT EMPLOYEE_ID AS "Employee ID", JOB_ID AS "Occupation", START_DATE, END_DATE, (END_DATE-START_DATE)+1 "Days Employed" FROM JOB_HISTORY;
Character and String Concatenation Operator
The double pipe symbols || represent the character concatenation operator This operator is used to join character expressions or columns together to create a larger character expression Columns of a table may be linked to each other or to strings of literal characters to create one resultant character expression The concatenation operator is flexible enough to be used multiple times and almost anywhere in a character expression Consider the following query:
SELECT 'THE '||REGION_NAME||' region is on Planet Earth' "Planetary Location", FROM REGIONS;
Here, the character literal The is concatenated to the contents of the REGION_NAME column This new string of characters is further concatenated to the character literal region is on Planet Earth , and the entire expression is aliased with the friendly heading Planetary Location
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