4.2: Simple Query
- Page ID
- 15511
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)The simplest query is one that displays a complete table – all rows and columns. Suppose we want to list all books in the library. The process of creating the query is as follows:
- Click on the Create tab if necessary and then click on the Query Design icon. Now you can right-click in the Relationships area and choose the Show Table option
- A window pops up, and from the list of tables you must double-click Book:
Figure \(\PageIndex{1}\): The QBE List of tables. - Choose Close from the Show Table pop up window
MS Access displays the Book table and its fields in the Relationships area. The first in this list is an * which stands for all attributes – double-click the *. This results in the following:
We can run the query to test it and confirm it does what we expect: list all rows in Book. To run a query, click the Run icon:
There are other views of a query. If you click the drop down just below the View icon:
You can see all the ways of viewing a query, including:
- Datasheet View
- Design View
- SQL View
You can also run a query by choosing Datasheet View. When developing a query one often alternates between Datasheet View and Design View in order to get the query working as required. When you run a query, MS Access will retrieve the information requested. In this case the results of running the query are:
|
callNo |
title |
author |
paperback |
|---|---|---|---|
|
CB 351 M293 1983 |
Atlas of medieval Europe |
Donald Matthew |
True |
|
HQ 1143 P68 1975 |
Medieval women |
Eileen Power |
False |
|
PC 14 V48 1965 |
Medieval miscellany |
Frederick Whitehead |
True |
|
QA 76.73 S67C435 2004 |
Joe Celko's Trees and hierarchies in SQL for smarties |
Joe Celko |
False |
|
QA 76.73 S67C46 1997 |
Joe Celko's SQL puzzles & answers |
Joe Celko |
True |
|
QA 76.76 A65P76 2011 |
Programming Android |
Zigurd R Mednieks |
True |
|
QA 76.9 D26H355 2008 |
Information modeling and relational databases |
T A Halpin |
True |
|
QA 76.9 D26H39 1996 |
Data model patterns : conventions of thought |
David Hay |
True |
|
QA 76.9 D35C45 1999 |
Joe Celko's data & databases : concepts in practice |
Joe Celko |
False |
|
R 141 E45 2006 |
Medieval medicine and the plague |
Lynne Elliott |
False |
|
R 487 T35 1967 |
Medicine in medieval England. |
Charles H Talbot |
False |
You can save the query:
Now you can see the query listed as a database object. The query can be run any time by an end user. The results of the query are not stored or saved – only the definition of the query. Whenever a user runs the query the current contents of the Book table are accessed.