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As with the conjunctive operators, if you mix arithmetic operators in the same SQL statement without using parentheses, there is a precedence that determines the order in which the operators are evaluated. Thankfully, the precedence in SQL is the same one we use in regular mathematics. In grade school, I learned the phrase Please My Dear Aunt Sally to remind me that the order of precedence is parentheses, multiplication, division, addition, and subtraction. However, it s always best to use parentheses so that neither you nor anyone who reads your SQL statement has to remember the order of precedence. Here are some examples using arithmetic operators: How much would it cost to buy both the VHS and DVD copies of The Last Samurai Notice that I am using an alias name for the column in the result set. If I didn t do this, the SQL engine would be forced to generate a name for the column since the column value in the result set comes from a function instead of a column. Generated names are usually not easy to read, so I recommend you always give an alias name to any calculated column.
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SELECT RETAIL_PRICE_VHS + RETAIL_PRICE_DVD AS COST FROM MOVIE WHERE MOVIE_TITLE = 'The Last Samurai'; COST ---------35.91
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How much would the same purchase cost if I had a coupon for \$5 off Although not technically necessary, I added parentheses because they make the statement more readable.
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SELECT (RETAIL_PRICE_VHS + RETAIL_PRICE_DVD) - 5 AS COST FROM MOVIE WHERE MOVIE_TITLE = 'The Last Samurai'; COST ---------30.91
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If the tax rate is 8.25 percent (0.0825), what would be the sales tax on the purchase Assume that tax is calculated on the entire sale price (that is, before any coupons are subtracted). The parentheses in this statement are essential to getting a correct result you must make sure the addition is done before the multiplication. You might also notice that I omitted the spaces before and after the addition operator (+). While more dif cult to read this way, SQL does not require that arithmetic operators have spaces around them.
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SELECT (RETAIL_PRICE_VHS+RETAIL_PRICE_DVD) * 0.0825 AS TAX FROM MOVIE WHERE MOVIE_TITLE = 'The Last Samurai'; TAX ---------2.8728
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You may have noticed that the result has more than two decimal places, which doesn t match the precision of U.S. currency (dollars and cents). However, you have not learned how to round numbers yet. Rounding can be done using an SQL function, which I discuss in the Basic SQL Functions section, so you ll soon know how to round. What is the average cost of a copy of The Last Samurai You ll determine this by adding the DVD and VHS prices and dividing by 2. Again, the parentheses are essential to achieving a correct result. You may notice that this result could also bene t from rounding.
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SELECT (RETAIL_PRICE_VHS + RETAIL_PRICE_DVD) / 2 AS AVG_COST FROM MOVIE WHERE MOVIE_TITLE = 'The Last Samurai' AVG_COST ---------17.955
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SQL Demysti ed
Basic SQL Functions
A function is a special type of program that returns a single value each time it is invoked. The term comes from the mathematical concept of a function. In SQL, functions always require an expression, which often includes the name of a column. Functions are most often used in the column list of the SELECT statement and are invoked for each row processed by the query and therefore return a single value for each row that appears in the result set. Sometimes the term column function is used to remind you that the function is being applied to a table or view column. A number of functions are provided by the DBMS vendor, and in most SQL implementations, you can write your own using a special language that comes with the DBMS, such as PL/SQL for Oracle, or Transact SQL for Microsoft SQL Server and Sybase Adaptive Server. Functions can be categorized in many ways, but most people categorize them by the type of work that they perform. The most common functions are described here, but as always, check your DBMS documentation it s likely that it provides more functions than the ones covered in this book. The categories used in this book are character, mathematical, conversion, and aggregate, and each category has its own sections.