Simple Queries

Queries are saved sets of instructions that allow users to view selective parts of data contained in one or more tables or other queries. These instructions are written in a language called Structured Query Language (SQL). Each time a query is "run" it selects for display from the data currently in the database so that if data is added and then a query is run, the new data will be displayed according to the instructions contained in the query. Tow major functions of queries are ordering and filtering.

Related Tutorials

Action queries
Action queries are queries that permit us in just one operation to perform changes on one o various rows in a table. With these queries we can create a new table including in it the records of another, change the data stored, insert new records or erase old records. Learn how to Make-table queries, Update queries, Append queries, Delete queries and Unshowing confirmation messages

Using Queries to Examine Your Data
Learn about another, more powerful tool provided by Access--queries. Like filters, Access queries let you select specific data from your table. However, queries are much more powerful than filters. By the time you finish this tutorial, you will understand the following key concepts: what queries are, what types of queries Access lets you create, how Access stores queries, how to use the Query Wizards, how to design your own queries, how to use the QBE grid and how to set properties in a query.

Advaned Queries and SQL
This week we're going to take queries to another level. We discussed the commonly used select query in last week's tutorial. This week we'll discuss some other ways to retrieve data as well as other query operations that allow for updating, adding, and deleting data. We'll start this lesson with a look at some special purpose queries: parameter and autolookup queries. After that we'll discuss the action queries update, append, make-table, and delete. TOC: Advanced Queries and SQL; AutoLookup Queries; Update Queries; Delete Queries; SQL (Structured Query Language).

Extend Access with Pass-Through Queries
In this article, we will devote our efforts to the latter of the three options, and concentrate on the use of Pass-Through queries as the medium of communication. Our examination of Pass-Through queries will include the following: the nature of Pass-Through queries, and instances in which their use is warranted; the advantages and disadvantages incumbent within the choice to use Pass-Through queries; creation and operation of a Pass-Through query to a MSSQL Server 2000 database.

Do Stored Queries Increase the Speed of Access Queries?
Having mentioned the ability to execute stored Access database queries from ASP via ADO in a thread at SitePoint Forums, Dave Maxwell asked what the speed difference was (if any) between these stored queries and traditional hardcoded dynamic queries. I had to confess that I didn't know, but I said that I would find out. This article is the result of the research that followed ...

Working with Queries in Access 2003
In this section, you'll learn how to: Create queries, Sort results, Add criteria, Employ Boolean operators, Find duplicate records, Create Update queries, Create Delete queries.

Working with Queries in Access 2007
In this section, you'll learn how to: Create queries, Sort results, Add criteria, Employ Boolean operators, Find duplicate records, Create Update queries, Create Delete queries.

Queries and Filters
Queries and filters are primary ways to find and organize your data. A filter is saved with a table and can't be reused for other objects unless you save it as a query. Queries can be used to answer questions themselves, but can also be used as the foundation for forms and reports. Creating queries and filters involves tasks such as sorting data, choosing data (setting criteria), and selecting tables and fields. Queries are more versatile than filters and you can use them to mass update, delete, and add records to a table. You can also do substantial calculations with queries

Enhancing Queries
To enhance the result produced by a query, you can use some of the built-in functions of Microsoft Access. You can use a function to control the values that would display in the query or you can include the functions in the condition set to filter the values. TOC: Using Functions, Summary Queries, Parameterized Queries, Action Queries: Table Creation, Action Queries: Appending Records.

Queries that change data
All of the queries that you have created to this point have been variations of "select" queries. Select queries are used to display data, but do not actually change the data in any way. In this lesson, you are going to learn about action queries. Learn: What is an action query? Why use action queries? Learning objectives: understand the difference between action queries and select queries; make a backup copy of a table using an action query; undo (rollback) an action query once it has been executed; update only certain records in a table; create a button on a form that executes an action query when pressed. (pdf file, install Acrobat Reader to read this tutorial)

Working with Queries
Queries are the stars of Microsoft Access. Queries make sense out of all the thousands of jumbled records and display exactly what you need to know. Queries discover things like what the average price of tea in China is or which customers bought the most parakeet food from your company. Queries can even make widespread changes to the records in your database without wearing out your mouse and keyboard! For example, a delete query can automatically delete a whole bunch of records that meet your criteria.

Parameterized Queries in Access
Parameterized queries are a great asset when developing database applications. They allow you to modularize your code, so that it's easier to read and maintain. Another great benefit of parameterized queries is that they run faster than queries which you explicity type in each time.

Plan for Null Responses in Your Parameter Queries
Parameter queries in your database are a favourite with many users because they're efficient, easy to create, and they offer a dynamic solution when you want to query the same field for different criteria. For the most part, parameter queries work great until you decide not to limit the results of the query. For instance, suppose you want to return all of the records in a table. If you ignore the parameter request by entering nothing in response to the prompt, Microsoft Access doesn't return any records. In this article, we'll show you a simple way to avoid this behaviour.

Microsoft Access Stored Queries and VBscript
Microsoft Access is a very commonly used database, and enables its users to run queries on the database contents. More than that Microsoft Access allows users to store useful queries meaning that the queries can be rerun whenever required without the need to rewrite them. This is also useful for any programmers who can run queries on the database rather than write them into their applications. If the programmer is using VBScript they can even write a script that will create the queries automatically.

A Quick Microsoft Access 2000 Tutorial
This tutorial is intended for computer science students who need a quick introduction to Microsoft Access, but it will be useful to anyone needing such an introduction. To get the full benefit of this tutorial, you will need a computer running one of Microsoft Windows 95 or higher, Microsoft NT 4.0 or higher, or Microsoft Windows 2000. You will also need to have a copy of Microsoft Access 2000 installed. Chapters: -Getting Started -Adding and Changing Data -Simple Queries -Creating QBE Queries -Multi-table QBE Queries -SQL Queries

Queries-Based Functions
These functions can also be used in queries and even included in SQL statements. The SQL interpreter of Microsoft Access can recognize these functions as long as you use them appropriately. Topics: Queries and Built-In Functions, Summary Queries and SQL Aggregate Functions.

Access Report from two queries
I have created two queries that have one field each. I'd like to create a report that states the results of both queries and cannot get anything to work. Any suggestions???

Default Permissions for new Query
You can change the default permissions that allow others to view data returned from queries or in the case of action queries, to run the queries, even if they are otherwise restricted from viewing the underlying table or query. Changing the default permissions affects only new queries.

Retrieving and Arranging Data Meaningfully
We'll cover three important and related topics this lesson: filtering and sorting records, and basic queries. When you Sort records you order them in meaningful ways. When you filter records you hide those you don't want to see. Queries are like powerful filtering and sorting tools that also perform calculations. We'll discuss some basic queries in this lesson and more advanced queries next time. TOC: Retrieving and Arranging Data Meaningfully; Filtering; Basic Queries; Select Queries.

Regarding queries in ms access, while converting to mysql
Currently I am working on a project to convert ms access back end to mysql back end. Front end is still going to be ms access. The backend which is currently held in ms access is a different file, meaning front and back ends aren't in one mdb. Now i heard alot of suggestions about converting access tables to mysql tables, but not much discussions are held about queries. My questions are: (1) I have around 30-40 queries , querying forms, subforms & reports. Should i convert them to mysql queries or should i just leave it the way it is. (2) Will converting queries to mysql queries increase/decrease the speed. (3) How efficient are ms access queries. i find them extremely friendly to work around and i can create any query using its design view or with sql very fast. (4) also off the topic are there any tools that can be used to show the time taken by each forms or queries to run and load in ms access...

Queries in MS Access
Is there any way to write queries in access like you could in SQL? Eg. JOIN, GROUP, SELECT etc. It's just I have linked a MySQL database to it and I need to run some queries so I can output the data how I want it. It would probably require some VB work though? Any nice tutorials on the matter would be great

Creating and Running a Report
Reports are similar to queries in that they retrieve data from one or more tables and display the records. Unlike queries, however, reports add formatting to the output including fonts, colors, backgrounds and other features. Reports are often printed out on paper rather than just viewed on the screen. In this section, we cover how to create simple reports using the Report wizard.

Microsoft Access Queries Tutorial
In MS Access you can use queries to extract information (data) from one (or more) tables (or from other queries). The information you retrieve can be limited by the definition of your query. In access queries are database objects that can be used to retrieve a subset of data.

Queries
Queries select records from one or more tables in a database so they can be viewed, analyzed, and sorted on a common datasheet. Toc: Introduction to queries, Create a query in design view, Query wizard, Find duplicates query, Delete a query

Microsoft Access for Beginners Part III: Writing the Queries
A database storing every bit of knowledge you could ever need wouldn't be of much use without some way to retrieve the data. After I create the tables, my next step is usually to create the forms for the database but first I need to provide some information on queries. Many of the queries that you use will actually be created automatically as you design forms and reports which often use them to obtain the required data. You may never even notice them. If you do any significant amount of work with Access, however, you will need to know how to construct queries for those times when you need something specific.

Simple Queries
It is easier to give examples of queries than to give a formal definition. So consider, for example, the Products table in the Northwind sample database. The Products table lists both current and discontinued products. You can tell which is which by looking at the Discontinued field of the Products table. Suppose you want a list of all current products. It is inconvenient to print out all 77 product records in the table and then run down the list by hand and check off those which are not discontinued. It would be far easier to let the computer do the work by querying the database and getting a machine prepared list of current products. This is where queries come in.

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.

Creating Action Queries - Update, Append and Delete Queries
Most Microsoft Access database users will use database queries to request or question information from one or more of your database tables. In Microsoft Access certain queries can also be used to change data as well as display or retrieve it. These queries, defined as Microsoft Action queries, will allow the user to update data (Update Query), delete data (Delete Query) or add data from one database table to another (Append Query).

Progress Meter
When we process large volume of data in MS-Access for Reports it may take few minutes to several minutes to complete them, depending on the size of the transactions involved. We have to run VB Routines or several Action Queries, which takes data from other Queries or Tables, and sequence the process steps through Macros to complete them. If you have Queries of Select Type or Action Query that pulls data from Crosstab Queries and if large volume of transactions involved, it takes longer than the Normal Queries to prepare the output.

Microsoft Access 2003 (comprehenisve)
A complete tutorial on Access 2003. It includes 12 units which includes reports, forms, action queries, crosstab queries, summary queries, relationships, creating and modification of data tables, and more.

Multiple Parameters for Query
Queries are an essential element in data processing and we use them a lot in various ways. While creating Queries the main issue we are faced with is how to filter data in a user-friendly manner and make things work effortless for the User. We use several methods to facilitate the user to pass values as criteria to the Queries.

Combine the results of several select queries by using a union query
When you want to review all of the data that is returned by several similar select queries together, as a combined set, you can use a union query. This article shows you how to create a union query from two or more existing select queries and also explains how to write a union query by using Structured Query Language (SQL). To complete the examples in this article, you should have a basic understanding of how to create and run select queries.

Access 2007, Deleteing Queries
In Access 2007 where are the queries kept and how can I delete queries that are no longer needed?

SQL Queries in Microsoft Access
Microsoft Access is and excellent package for handling databases. Its query feature is used to retrieve data in desired formats. You can also use SQL Queries. SQL queries are those that are created using the various SQL commands like SELECT, DELETE, UPDATE or APPEND

Combining 2 queries into one
I have two separate queries that I would like to combine into one. Unfortunately, I can't use join, due to one query has a where statement and the other doesn't.

Using queries to get the information you need
At first glance, it appears that splitting information into multiple tables and relationships creates more of a headache than it is worth. People generally like to have all the information they require on one screen (like a spreadsheet, for instance); they do not want to have to know about multiple tables, foreign keys, relationships, and so on. Saved queries address this problem. Queries allow the user to join data from one or more tables, order the data in different ways, calculate new fields, and specify criteria to filter out certain records. The important thing to keep in mind is that a query contains no data it merely reorganizes the data from the table (or tables) on which it is built without changing the "underlying tables" in any way. Once a query is defined and saved, it can be used in exactly the same way as a table. Because of this, it is useful to think of queries as "virtual tables". Indeed, in the majority of DBMSes, saved queries are called views because they allow different users and different applications to have different views of the same data. Learning objectives: create different types of queries; understand how queries can be used to answer questions; develop a naming convention for queries; understand the difference between an 'updatable' and 'non-updatable' recordset. (pdf file, install Acrobat Reader to read this tutorial)

Advanced Queries
We are going to teaches you how to work with advance queries in MS-Access.

Action Queries
We have used queries so far only to create a list of fields that would be considered for a set of records. We also mentioned that a query in Microsoft Access is simply a means of graphically representing data. Indeed, a query is based on a SQL statement. As SQL is its own, fully functional language, we can use it perform far more operations than to only select columns for a query. The SQL can be used to create tables, perform data entry, modify records, etc. Some of these operations can be performed visually in the query Design View. They can also be performed using SQL statements. To know what is going on behind the scenes, you can write your own code. You can also use the Design View to start a query, and then open the code to customize the statement. Topics: Queries and Table Creation, SQL and Table Creation, SQL and Data Entry, Queries and Record Appending, Queries and Records Updating, Queries and Table Deletion, Queries and Record Deletion.

Queries on Steroids - 4
This article covers the tools available to analyze queries in both Microsoft Access and SQL Server, with a limited explanation of how the results may be interpreted.

Simple Queries

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