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Microsoft Access Database Is The Best For Storing Your Business Data.

March 12, 2010 By: lilybird Category: Software

A lot of people prefer storing their data in databases instead of flat files and there are many reasons for this. One of the reasons is that data can be found and grouped much better, when stored in a database. The capability to extract data out of the database depends on the possibility to structure queries. It is relatively easy to structure queries in Access 2007, because this application is designed to work with many different kinds of operators.

Operator is a specific symbol or saved word, which triggers the database to perform a certain action. Access 2007 is made to recognize several kinds of operators such as arithmetic operators, comparison operators, logical operators and expressions including like, between… and, in, etc. when you structure your Access 2007 queries, you can also combine these operators.

You can ask Access to perform some kind of comparison between two values using the comparison operators. When used in a query, comparison operator can find all records with a field value which is greater, equal too, less than, not equal too, etc. to a specified value. These operators can be used with all fields that have a literal value, which is a value that has been entered into the field directly. There are four literals, which Access recognizes. They are text, dates, times, numbers and constants.

As for the arithmetic operators, they include basic mathematical operators. Operators, which Access recognizes, are addition, subtraction, division, multiplication, modulus, exponentiation and unary operators. Arithmetical operators are used to build different mathematical expressions like formulae and others. You would also use these operators for calculating the total value of records or for creating an invoice.

There is also “like” operator, which can be applied to define less specific search criteria. This operator is also used with a wildcard * or ?. The ? wildcard replaces a single character. And the * wildcard is used for the string of characters. So, when you run a query “like a?c” or “like a*c”, Access will produce the results containing words beginning with a and ending with c, but with a different amount of characters in between. The “between…and” operators are recognized by Access for identifying a range of different values. You can use it to limit the range of values.

Access 2007 also recognizes logical operators, which are and, or, not, eqv, xor and imp. The “and” operator will return the real value only when both conditions are true, while “or” operator will return the true value when at least one of the expressions is true. The “not” operator negates the condition. As for the “xor” operator, it is the exclusive “or”, so it gives a true value if only one expression is true or not true. The “imp” operator gives a value when the first expression is true and the second one is not. And “eqv” operator gives a true value, if both conditions are equal.

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