DAY 17:ACCESS CHAPTER 3

Tazin AfrinTazin.Afrin@mail.wvu.edu

October 17, 2013

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OBJECTIVES

• Order of operation• Calculated field• Expression syntax• Expression builder• Built-in finctions• Date arithmetic

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ORDER OF OPERATION

• Determines the sequence by which operations are calculated in an expression.

• Parentheses ( )• Exponentiation ˆ• Multiplication *• Division /• Addition +• Subtraction –

2+3^2 = 11(2+3)^2=25

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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)

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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]

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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

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BUILT-IN FUNCTION

• PMT• IIF• Date, DatePart, DateDiff

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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)

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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)

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DATE ARITHMETIC

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

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NEXT CLASS

• Access Chapter 3– Aggregate function

• Access Chapter 4

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