Difference between revisions of "LibreOffice-Suite-Base/C2/Create-queries-using-Query-Wizard/English-timed"
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| − | ||In this tutorial, we will learn how to: create simple queries using the '''Query wizard''' | + | ||In this tutorial, we will learn how to: create simple queries using the '''Query wizard'''Select fields |
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Set the sorting order of the fields and | Set the sorting order of the fields and | ||
provide search criteria or conditions for a query. | provide search criteria or conditions for a query. | ||
Revision as of 10:29, 10 March 2017
| Time | Narration |
| 00:02 | Welcome to the Spoken tutorial on LibreOffice Base. |
| 00:06 | In this tutorial, we will learn how to: create simple queries using the Query wizardSelect fields
Set the sorting order of the fields and provide search criteria or conditions for a query. |
| 00:24 | Let us first learn what a query is. |
| 00:29 | A query can be used to get specific information from a database. |
| 00:36 | In other words, we can "query" the database for some data that matches a given criteria. |
| 00:48 | For example, let us consider our familiar 'Library' database example. |
| 00:56 | We have stored information about books and members in our Library database. |
| 01:04 | Now we can query the Library database for all the members of the Library. |
| 01:12 | Or we can query the database for all the books that are not in the Library. |
| 01:21 | Let us see how we can create a simple query using Base. |
| 01:30 | Our example is to list all the members of the 'Library' along with their phone numbers. |
| 01:44 | We are in the 'Library' database. You probably know how to open this by now. |
| 01:51 | Let us click on the Queries icon on the left panel. |
| 01:57 | On the right panel, we see three options. |
| 02:03 | Since we are creating a simple query first, we will choose an easy and fast method. |
| 02:11 | And that is by using a Query Wizard. |
| 02:17 | For creating complex queries, Base provides us with very handy options such as 'Create Query in Design View' |
| 02:28 | and 'Create Query in SQL view' which we will learn about later. |
| 02:36 | For now, let us click on 'Use Wizard to Create Query'. |
| 02:43 | Now, we see a pop-up window that says Query Wizard on the top. |
| 02:50 | On the left, we see 8 steps that we will go through. |
| 02:57 | We are in Step 1 - 'Field Selection'. |
| 03:03 | On the right side, we will see a drop-down box underneath the label Tables. |
| 03:11 | This is where we will select the source of the data that we need from this query. |
| 03:21 | Since our example query is about getting a list of all the members of the Library, we will click on the Tables: Members from the drop-down box. |
| 03:35 | Now, let us double-click on the Name field in the Available fields list on the left and move it to the list box on the right. |
| 03:50 | Next, let us click on the Phone field on the left and move it to the right. |
| 04:00 | Note that to move all the fields to the right, we can use the double-arrow button that points to the right. |
| 04:09 | Now, let us click on the Next button at the bottom. |
| 04:15 | Now we are in Step 2 - Sorting Order. |
| 04:20 | Since the result of our query is a list of members and their phone numbers, we can leave this as it is. |
| 04:30 | Or we can order the list by member names. |
| 04:36 | The Base Wizard allows us to sort up to 4 fields in the result list at a time. |
| 04:45 | For now, let us click on the top most drop-down box, |
| 04:51 | And click on Members.Name. |
| 04:55 | We can also choose if we want to sort the names in ascending or descending order. |
| 05:03 | Let us click on the Ascending option |
| 05:07 | and proceed to the next step. |
| 05:11 | Step 3 - Search Conditions. |
| 05:16 | This step will help if we want to limit our result set to some conditions. |
| 05:22 | For example, we can limit the result set to only those members whose name starts with the alphabet R. |
| 05:34 | For this, we will click on the Fields drop-down box and then click on Members.Name. |
| 05:45 | Now, click on the Condition drop-down box. |
| 05:51 | Notice the various conditions here. |
| 05:58 | Let us click on like. |
| 06:02 | In the Value text box, let us type in ‘capital R’ and a ‘percentage symbol’. |
| 06:13 | This is how we can introduce simple and complex conditions into our query. |
| 06:22 | Let us now delete the 'R%' from the Value text-box to list all the members and click on the Next button. |
| 06:37 | Please note that we have skipped to Step 7. |
| 06:43 | This is because we are creating a simple query from a single table. |
| 06:51 | And our query will return details and not summaries. |
| 06:57 | Summary queries show data from aggregate functions and by grouping. |
| 07:05 | Some examples are count of all the members or sum of the prices of all the books. |
| 07:13 | We will learn about these later. |
| 07:17 | Okay, now here let us set aliases, |
| 07:23 | meaning- let us provide friendly and descriptive labels or headers in the resulting list. |
| 07:32 | So the 'Name' field can have an alias as 'Member Name' and the 'Phone' field can have an alias as 'Phone Number'. |
| 07:46 | So, let us type in these new aliases in the two text-boxes and click on the Next button. |
| 07:57 | Now, we are in Step 8 - the final step. |
| 08:03 | Here let us give a nice descriptive name to our simple query. |
| 08:09 | Let us type in 'List of all members and their phone numbers' against the 'Name of the Query’ label. |
| 08:20 | Now, notice that we see an overview of our choices in the wizard. |
| 08:27 | And how do we want to proceed from here? |
| 08:31 | Let us click on the 'Display Query' option on the top right side and click on the Finish button. |
| 08:41 | The wizard window has closed and there is a new window whose title says- 'List of all members and their phone numbers'. |
| 08:52 | Notice that we see all the four members that we originally entered in the Members table along with their phone numbers. |
| 09:04 | Also, we see that this list is arranged alphabetically in ascending order. |
| 09:13 | So, this is our first simple query. |
| 09:18 | Here is an assignment. |
| 09:21 | Create a query that will list all the Books in ascending order. |
| 09:28 | Include all fields. |
| 09:31 | Name it as ‘List of all books in the Library’. |
| 09:38 | This brings us to the end of this tutorial on Creating Queries using Wizard in LibreOffice Base. |
| 09:45 | To summarize, we learned how to :
Create simple queries using the Query wizard Select fields Set the sorting order of the fields And provide search criteria or conditions for a query. |
| 10:00 | Spoken Tutorial project is a part of the Talk to a Teacher project, supported by the National Mission on Education through ICT, MHRD, Government of India. |
| 10:12 | This project is coordinated by http://spoken-tutorial.org. |
| 10:17 | More information on the same is available at the following link. |
| 10:22 | This script has been contributed by Priya Suresh, DesiCrew Solutiions. And this is soundharya, DesiCrew Solutions, signing off.
Thanks for joining. |
