LibreOffice Base Queries Quiz

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Questions and Answers

What is the purpose of using 'IS EMPTY' in the Return_Date field?

To add an alias to the Return_Date field

To display records with Return_Date filled in

To sort the records in descending order by Return_Date

To filter records for media that have not yet been returned (correct)

Which SQL command is used to specify the sorting order of query results?

GROUP BY

SELECT

WHERE

ORDER BY (correct)

When is 'IS NULL' used instead of 'IS EMPTY'?

To add a new field to a query

In graphical user interface

In Design Mode only

In SQL Mode (correct)

What indicates that a field has been linked in the Design view?

Direct links shown between tables Signup and view all the answers

Which command must you use to sort by descending order in SQL?

DESC Signup and view all the answers

Which of the following is a characteristic of linking tables in Design Mode?

Links can only be created if they were declared earlier Signup and view all the answers

What is shown in the SQL query when switching from Design Mode to SQL Mode?

Selection criteria used in the query Signup and view all the answers

What must be done to display the readers’ names in the query results?

Include the Reader table in the query Signup and view all the answers

What is the primary purpose of queries in a database?

To quickly filter and retrieve specific records from large datasets. Signup and view all the answers

Which of the following methods can be used to enter queries into a database?

Through GUI or SQL code entry. Signup and view all the answers

What should be done first when creating a query in Design View?

Select at least one table to base the query on. Signup and view all the answers

During the creation of a query, what does the tabular area in the Query Design dialog allow you to do?

Select fields for display and set conditions related to those fields. Signup and view all the answers

What happens if you try to create a query without selecting any tables?

The database management system will prevent the creation of the query. Signup and view all the answers

What is the function of the 'Add' button in the Query Design dialog?

To include a selected table, view, or query into the current query. Signup and view all the answers

When developing a query using the Query Design dialog, what occurs after selecting all necessary tables?

You click the Close button to finalize the selection of tables. Signup and view all the answers

What does the graphical area in the Query Design dialog display?

It displays tables linked to the query and their relationships. Signup and view all the answers

What can be used as a criterion for a query while not providing any visible data in the results?

Return_Date Signup and view all the answers

Which method allows sorting results by 'Loan_Date' and 'Loan.Reader_ID'?

Using a temporary invisible field for sorting. Signup and view all the answers

In a SQL query, what is the function of the Count?

To calculate the number of records based on a specific criterion. Signup and view all the answers

What is necessary for a field to be suitable for the Count function in a query?

The field must not be empty in any of the records. Signup and view all the answers

How can fields be sorted in the graphical user interface?

By dragging and dropping the fields in the tabular view. Signup and view all the answers

When adding a sorting field temporarily, what is required for it to be registered correctly?

The field must be an alias. Signup and view all the answers

What functionality allows grouping records by Reader_ID in a query?

The Grouping function. Signup and view all the answers

Which SQL command is needed to sort by 'Loan_Date' and 'Loan.Reader_ID'?

ORDER BY Loan_Date, Loan.Reader_ID Signup and view all the answers

What does the EVERY function return if at least one student in a swimming class cannot swim?

FALSE Signup and view all the answers

Which statistical function would return 0 if all values within a group are equal?

VAR_POP Signup and view all the answers

What is necessary to display fields from multiple tables in a query?

Combination of table name with field name. Signup and view all the answers

What is indicated by a check mark in the Swimmer field of the output?

ALL students can swim. Signup and view all the answers

Which statement correctly describes the use of the '*' symbol in a query?

It is used to display all fields of a single table. Signup and view all the answers

What effect does using DISTINCT have in a query?

It excludes records with the same values. Signup and view all the answers

When is it necessary to use the INTO command in a SQL query?

To create a new table directly from a query. Signup and view all the answers

What happens if a query attempts to write into a new table without defining a primary key?

The new table is not editable initially. Signup and view all the answers

What SQL query is used to retrieve titles of media that have not been loaned out?

SELECT 'Title' || ' - Nr.' || 'ID' FROM Media WHERE ID NOT IN (SELECT Media_ID FROM Loan WHERE Return_Date IS NULL) Signup and view all the answers

Which font is recommended for creating a fixed-width display of items in a tabular form?

Courier Signup and view all the answers

What is the significance of using the function LEFT in the SQL query for the Stock display?

It formats the Stock field to a maximum of 25 characters. Signup and view all the answers

How should non-printing characters like newlines be handled in the SQL query?

By replacing them with a space using REPLACE function. Signup and view all the answers

What is the purpose of LEFT(REPLACE('Stock', CHAR(10), ' '), 25) in the SQL query?

To trim Stock values to 25 characters and replace newlines with spaces. Signup and view all the answers

What does the RIGHT function accomplish in the SQL query displaying Stock?

It extracts the rightmost characters from the Price field. Signup and view all the answers

What SQL clause is used to sort the final output of the Stock query?

ORDER BY (Stock || ' - ' || Price || ' €') ASC Signup and view all the answers

What will happen if the Price exceeds € 99999,99 in the displayed output?

It will be truncated to fit within the space allocated. Signup and view all the answers

Study Notes

Queries in LibreOffice Base

LibreOffice Base allows creating queries in both graphical user interface (GUI) and SQL code.
Using Query Design dialog allows for visual query creation.
Query Design dialog consists of two areas: graphical area and tabular area.
Graphical area displays tables with their relationships.
Tabular area is used for selecting fields, setting display conditions, and defining sorting order.
IS EMPTY function is used in Design view to filter for empty fields, while IS NULL is used in SQL view.
ASC keyword defines ascending order, while DESC defines descending order in sorting.
Functions can be used to perform calculations and other operations on data.
Count function counts non-empty fields in a table.
Grouping function groups records with the same value.
EVERY function returns TRUE if all values in a group meet a criteria, otherwise FALSE.
VAR_POP, VAR_SAMP, STDDEV_POP, STDDEV_SAMP are statistical functions that operate on integer and decimal fields.
Alias can be used to assign a different name to a field within a query.
"*" symbol in SQL can be used to select all fields from a table.
INTO keyword allows writing the query result into a new table.
CROSS JOIN, INNER JOIN, LEFT OUTER JOIN, RIGHT OUTER JOIN keywords are used to define relationships between tables.
NOT IN operator is used to filter records based on absence of a specific value.
LEFT function cuts a string from the left, RIGHT function cuts a string from the right.
SPACE function adds spaces to a string.
REPLACE function replaces specific characters in a string.
MAX function finds the maximum value in the specified field.
LENGTH function determines the length of the string.
To create tabular form in a listfield, you can use LEFT, RIGHT, SPACE functions to format strings.
You can use REPLACE function to remove unwanted characters like newlines from a string.
You can determine the number of spaces needed for padding based on the maximum length of a field.
You can use SPACE and RIGHT function to right-justify strings.

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Description

Test your knowledge on creating queries in LibreOffice Base, focusing on both graphical user interface and SQL code. This quiz covers essential functions, sorting methods, and design components for effective data querying.