1. DAY 17: ACCESS CHAPTER 3 Tazin Afrin Tazin.Afrin@mail.wvu.edu Tazin.Afrin@mail.wvu.edu October 17, 2013 1

2. OBJECTIVES Order of operation Calculated field Expression syntax Expression builder Built-in finctions Date arithmetic 2

3. ORDER OF OPERATION Determines the sequence by which operations are calculated in an expression. Parentheses ( ) Exponentiation ˆ Multiplication * Division / Addition + Subtraction – 3 2+3^2 = 11 (2+3)^2 =25

4. CALCULATED FIELD Create a calculation based on the fields from one or more tables. Use expressions – –Identifiers (the names of fields, controls, or properties) –Arithmetic operators (e.g., *, /, +, or –) –Functions (built-in functions like Date() or IIf()) –Constants (numbers such as 30 or.5) 4

5. EXPRESSION SYNTAX Entered in the first row of the query design grid. Must follow the correct syntax. Create expressions to perform calculations using field names, constants, and functions. Assign descriptive field names to the calculated fields. –MonthlyInterest: [Balance] *.035 / 12 –NewBalance: [Balance] + [MonthlyInterest] 5

6. EXPRESSION BUILDER Expression builder provides graphical tools for looking up operators (functions and arithmetic operators) and operands (existing fields, constants). Open query in design view -> design tab-> Query setup group -> builder Right click on field -> build 6

7. BUILT-IN FUNCTION PMT IIF Date, DatePart, DateDiff 7

8. PMT The Pmt function calculates the monthly loan payment given the interest rate (monthly), term of the loan (in months), and the original value of the loan (the principal). –Pmt(rate, num_periods, present value, future value, type) –Pmt(0.06/12, 4*12, 12500) 8

9. IIF The IIf function evaluates an expression and displays one value when the expression is true and another value when the expression is false. –IIf (expression, truepart, falsepart) –IIf (Balance >=10000,.035,.015) 9

10. DATE ARITHMETIC The DatePart function enables you to isolate a specific part of a date, such as the year. –DatePart(“yyyy”, [Employees]![HireDate]) 10

11. NEXT CLASS Access Chapter 3 –Aggregate function Access Chapter 4 11

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