logical operators in a query

I am using the below expression in an update query:

([tblItemMaster]![RuleMet1] = "Yes" AND [tblItemMaster]![RuleMet2] = "No")
OR ([tblItemMaster]![RuleMet1] = "No" AND [tblItemMaster]![RuleMet2] = "Yes")
[tblItemMaster]![ItemQualified] ="No", "")

I have records in tblItemMaster that meet the criteria:
([tblItemMaster]![RuleMet1] = "Yes" AND [tblItemMaster]![RuleMet2] = "No")
([tblItemMaster]![RuleMet1] = "No" AND [tblItemMaster]![RuleMet2] = "Yes")

However [ItemQualified] does not get updated to "No" in tblItemMaster.

I am not sure if I used correct syntax for logical operators

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Logical Operators in Access SQL
Originally, logical operators were a concept from algebra used to exclude and include number sets. They are, very simply, NOT, AND, and OR. Sometimes this set is expanded to combinations of the operators, but at core it's only these three. The logical operators are often referred to as the Boolean operators.

Table of operators
An operator is a sign or symbol that specifies the type of calculation to perform within an expression. There are mathematical, comparison, logical, and reference operators. Access supports a variety of operators, including arithmetic operators such as +, -, multiply (*), and divide (/), in addition to comparison operators for comparing values, text operators for concatenating text, and logical operators for determining true or false values. This article provides details about using these operators.

Query Criteria In Access 2010 Through Logical Operators
As the name implies, Query pulls out specific data from table fields included in database, thus, setting specific criterion in query helps you to filter down the table field data according to your needs. Through simple logical operators in Query Criteria you can set a criteria by using simple AND/OR operators, which lets you to confine the results of a query based upon the query criteria to check which table field data is to be included.

Exploring Data Analysis
To further enhance your filtering capabilities, you can use Boolean algebra combined with the operators we have used so far. Besides the logical operators we know already, Boolean algebra adds extra operators used to concatenate expression.

Database Operators and Operands
The fields we have been using allow the user to enter, view, or change data of a database. Because there is so many types of values a user can be ask to deal with, the values in the fields are categorized by types. Learn: Overview of Operators and Operands, Constants, Operators, Logical Operators.

Database Conditional Values
1) Boolean Values
2) Logical Constants
3) Logical Operations
4) Logical Functions
5) Value Checking Functions
6) Logical Comparisons
The above mentioned topics are covered in this Access 2007 tutorial.

Data analysis: Querying a Database
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Techniques of Data Analysis
Data analysis consists of examining the records of a table, an already existing query, or a form, to isolate records that respond to one or more criteria. To assist you with this, Microsoft Access provides all the (visual) tools you need. These include filtering by form and logical junction operators.

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A value is referred to as Boolean when it is either true or false. In other words, the value only be one or the other, never both, and not any other value. To support Boolean values, Microsoft Access provides a data type named Boolean.
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In this tutorial you will learn about creating queries. Topics: Details on Column Selection, Introduction to Logical Operators and Pattern Operator: LIKE.

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Situation: I'm creating a database to keep track of earth moving activities. There are multiple operators (people operating the earth moving equipment). There are also multiple pieces of equipment.
In any given shift, multiple operators may use one piece of equipment. Similarly, one operator may use multiple pieces of equipment.

I'm thinking that I should create a table for all the operators, and then a table for all the equipment and establish a 'many to many' relationship between the primary key of the equipment(the equipments ID number) and the primary key of the operators table (the operators employee number).

Is this a valid structure, and is it one that can be implemented in Access?

Conditional Statements
One of the goals of computer programming is telling the computer what to do when something occurs, and how to do it. This is performed by setting conditions, examining them and stating what decisions the computer should make. To perform the necessary conditions, you have two main options: Microsoft Access or Microsoft Visual Basic. Microsoft Access is equipped with a series of operators and functions destined to perform various operations. To use a condition in Microsoft Access, if you know the structure of the conditional statement, you can write it after typing an assignment operator. Because most conditions in Microsoft Access are in the form of functions, we will study them later on. For now, we will learn how to write conditions in the Microsoft Visual Basic language.
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Nest a query inside another query or in an expression by using a subquery
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Creating a Validation Rule in an Access Table
The validation rules use the same logical expressions that can be found typically in criteria of a query and must return a logical value of either TRUE or FALSE in order to accept or reject the value and trigger an exception (validation text property). This simple property is easier to apply than attaching a macro or VBA code to an event which means learning VBA programming!

List box with operators
I need to create a list box with operators and I'm having difficulty figuring out how to tell access that greater than = > and less than = < and or = or and so on

Microsoft Access Query Operators
Queries are a very important feature of Microsoft Access that can tell you information about the data stored in the Access tables. Queries make it easier to search the data from different fields. Therefore, using queries to achieve the results you are looking for is quite a useful tool. However, when you have large amounts of information, you will need more advanced techniques such as Boolean Operators to make sense of the queries you have inputted.

Introduction to Expressions
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This topic covers the following: Algebraic Expressions, VBA and Expressions, Procedures and Functions, The Expression Builder, Introduction to Built-In Functions, Logical Functions, Field Emptiness, Nullity Checking, Numerical Checking and Non-Zero Checking.

Examples of expressions
This article provides examples of expressions. An expression is a combination of mathematical or logical operators, constants, functions, table fields, controls, and properties that evaluates to a single value. You can use expressions to calculate values, validate data, and set a default value for a field or control.
In this article
* Understand expressions
* Examples of expressions used in forms and reports
* Examples of expressions used in queries and filters
* Examples of default value expressions
* Examples of field validation rule expressions
* Examples of macro condition expressions

Conjunction and Disjunction in Data Analysis
Consider a database that contains a list of students with various pieces of information. Imagine that our main goal is to make sure that we have a number we can use to contact somebody for the student. In this case, either the home phone number or the emergency number would be fine.
TOC: Logical Disjunction, Logical Conjunction.

Introduction to DAO, ADO, ADOX, and SQL
Microsoft Access ships with a language named Visual Basic For Applications, or VBA. This allows you to complement MS Access with code that can perform complex operations. This language is used throughout the Microsoft Visual Office family of applications, including Microsoft Excel, Work, PowerPoint, Visio, etc. This language is also used by applications published by companies other than Microsoft. An example is Autodesk that publishes AutoCAD. To customize the VBA language for our database environment, Microsoft Access includes a library called Microsoft Access Object Library.
Topics Microsoft Access Object Library and VBA, Microsoft Data Access Objects, Database Creation With DAO, The Structured Query Language, Introduction to SQL Operators, Unary Operators, Binary Operators, Microsoft ActiveX Data Objects, ADOX Fundamentals, The Data Source of an Application and The Connection to a Database.