Advanced Database - Lecture 3

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Questions and Answers

What is the correct SQL statement to insert a new row in the 'Employee' table with Emp_No = 20, Emp_Name = 'ali', and Emp_Salary = 1600?

  • insert into Employee (Emp_No, Emp_Name, Emp_Salary) values (20, 'ali', 1600); (correct)
  • insert into Employee (Emp_No, Emp_Name, Emp_Salary) values (20, ali, 1600);
  • insert into employee (Emp_No, Emp_Name, Emp_Salary) values (20, 'ali', 1600);
  • insert into Employee values (20, 'ali', 1600);

Which of the following SQL statements will display only the 'Emp_No' and 'Emp_Name' columns from the 'Employee' table?

  • SELECT * FROM Employee
  • SELECT Emp_No, Emp_Name WHERE Emp_No=12 FROM Employee
  • SELECT TOP 1 Emp_No, Emp_Name FROM Employee
  • SELECT Emp_No, Emp_Name FROM Employee (correct)

What SQL statement would you use to display all employees with an 'Emp_No' equal to 12?

  • SELECT Emp_No FROM Employee WHERE Emp_No = 12
  • SELECT * FROM Employee WHERE Emp_No LIKE '12'
  • SELECT * FROM Employee WHERE Emp_No=12 (correct)
  • SELECT * FROM Employee WHERE Emp_No = '12'

Which of the following SQL commands can be used to modify the design of a table?

<p>DESIGN (C)</p> Signup and view all the answers

What is the purpose of the 'SELECT DISTINCT' statement in SQL?

<p>To select unique values from a column. (B)</p> Signup and view all the answers

Which statement correctly inserts a new employee record with Emp_No = 17, Emp_Name = 'sara', and Emp_Salary = 1400 into the 'Employee' table?

<p>insert into Employee (Emp_No, Emp_Name, Emp_Salary) values (17, 'sara', 1400); (C)</p> Signup and view all the answers

Which of these SQL statements will display the 'Emp_No' and 'Emp_Salary' for the employee with 'Emp_No' equal to 12?

<p>SELECT Emp_No, Emp_Salary FROM Employee WHERE Emp_No=12 (B)</p> Signup and view all the answers

What SQL command is used to display all the data in a table without specifying the column names?

<p>SELECT * FROM Employee (A)</p> Signup and view all the answers

What is the purpose of the ORDER BY clause in SQL?

<p>To define how to sort the retrieved data (C)</p> Signup and view all the answers

Which of the following describes the term 'Column' in the context of SQL?

<p>The name of the field or fields to sort by (C)</p> Signup and view all the answers

What must be established to retrieve data successfully from a table?

<p>Conditions must be specified for filtering data (C)</p> Signup and view all the answers

Which statement about ORDER BY is incorrect?

<p>ORDER BY automatically groups the data (B)</p> Signup and view all the answers

When using the ORDER BY clause, what is necessary to specify?

<p>The columns or aliases for sorting (C)</p> Signup and view all the answers

What does the keyword 'FROM' indicate in a database query?

<p>The name of the table from which to retrieve data (C)</p> Signup and view all the answers

Which part of an SQL statement is used to declare the conditions for data retrieval?

<p>WHERE (A)</p> Signup and view all the answers

In an SQL query, what is specified by the 'SELECT' statement?

<p>The fields or columns to be retrieved from the table (B)</p> Signup and view all the answers

What is the function of the 'Table' identifier in an SQL query?

<p>To name the table from which data is being retrieved (B)</p> Signup and view all the answers

Which SQL statement would you use to specify multiple conditions for data retrieval?

<p>WHERE (C)</p> Signup and view all the answers

What symbol is used to indicate the end of a statement?

<p>Semicolon (B)</p> Signup and view all the answers

What action should you take to input values into a created database table?

<p>Right-click the table and choose 'Edit Top 200 Rows' (A)</p> Signup and view all the answers

What is the initial state of the data in the table when first opened for editing?

<p>Empty and showing all fields as Null (D)</p> Signup and view all the answers

Which of the following statements is true regarding the database table editing process?

<p>The 'Edit Top 200 Rows' option allows for data entry for the specified number of rows. (D)</p> Signup and view all the answers

Why might you find 'Null' values when opening a newly created database table?

<p>The table has not yet been populated with any data. (B)</p> Signup and view all the answers

What will happen if the WHERE clause is omitted in an UPDATE statement?

<p>All records in the table will be updated. (C)</p> Signup and view all the answers

Which statement correctly describes the function of the DELETE command?

<p>It removes records from a table. (A)</p> Signup and view all the answers

In the provided SQL command, what will be the Emp_Name of the employee with Emp_No 19 after the update?

<p>Areej (C)</p> Signup and view all the answers

What is the purpose of using the SET clause in an UPDATE statement?

<p>To define new values for columns that are updated. (D)</p> Signup and view all the answers

Which command would you use to change the salary of an employee while ensuring only one specific employee's record is updated?

<p>UPDATE Employee SET Emp_Salary=5000 WHERE Emp_No=32; (B)</p> Signup and view all the answers

What is the primary function of the 'SELECT' command in a database?

<p>To retrieve data from tables (A)</p> Signup and view all the answers

What does the '*' symbol represent in a 'SELECT' statement?

<p>All columns in the table (C)</p> Signup and view all the answers

Which of the following is a valid SQL 'SELECT' statement?

<p>All of the above (D)</p> Signup and view all the answers

What is the purpose of using a 'WHERE' clause in a 'SELECT' statement?

<p>To filter data based on specific criteria (B)</p> Signup and view all the answers

In the statement 'SELECT name, age FROM Students WHERE age > 18', what does the 'Students' part represent?

<p>A table name (B)</p> Signup and view all the answers

Flashcards

Columns

Field names specified for data retrieval from a table.

FROM

SQL keyword used to specify the table name for data retrieval.

Table

The name of the table from which data is fetched.

WHERE

SQL clause used to specify conditions for data retrieval.

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Conditions

Specified criteria used in the WHERE clause to filter data.

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SELECT statement

A SQL command used to retrieve data from tables.

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All fields selection

Using SELECT to retrieve every column from a table.

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SQL

Structured Query Language, used for managing and retrieving data in databases.

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Tables in databases

Structured collections of data organized in rows and columns.

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Data retrieval

The process of obtaining data from a database.

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ORDER BY

A SQL command used to specify the order of retrieved data from a table.

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Sorting

Arranging data in a specific order based on criteria like ascending or descending.

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Semicolon

A punctuation mark indicating the end of a statement or command.

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Edit Top 200 Rows

Option to access and modify the first 200 entries in a database table.

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NULL

Represents a lack of value or an empty field in a database.

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Input Data

The process of entering values into a database table.

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Database Table

A structured collection of related data organized in rows and columns.

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UPDATE statement

SQL command used to modify existing records in a table.

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SET clause

Specifies the columns and values to update in a SQL UPDATE statement.

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WHERE clause importance

Condition that determines which records will be updated or deleted.

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DELETE statement

SQL command used to remove existing records from a table.

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Deleting without WHERE

Deleting all records from a table if the WHERE clause is omitted.

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INSERT statement

A SQL command to add data to a table.

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Employee table

A table that stores information about employees.

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SELECT *

Retrieves all fields from a specified table.

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WHERE clause

Specifies conditions for filtering data in SQL queries.

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SELECT DISTINCT

Returns unique values from specified columns, eliminating duplicates.

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SELECT with condition

Retrieves specific data based on a given criterion using WHERE.

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Table design modification

Alters the structure of an existing table in a database.

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Study Notes

Advanced Database - Lecture 3

  • Data Retrieval (SELECT): The SELECT command is used to retrieve data from tables.
    • SELECT *: Retrieves all columns from a table.
    • Columns: Specifies the column(s) to retrieve.
    • FROM: Specifies the table from which to retrieve data.
    • Table: The name of the table.
    • WHERE: Specifies conditions to filter the retrieved data
    • Conditions: The criteria to meet for the retrieval to happen
    • ORDER BY: Orders the retrieved data by specific column(s).
    • Column: The column(s) used for ordering.

Inserting Data

  • Inserting data into a table: Use the INSERT INTO statement to add new rows to a table.
    • insert into Table_Name (fieldo, fieldl, field2, ...field N ) values(value0, value1, value2, ...value N): Add new values to specified columns in a table.

Data Modification (UPDATE)

  • Modifying Existing Data: The UPDATE statement modifies existing data in a table.
    • UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition: Modifies specific columns based on the 'WHERE' clause

Data Deletion (DELETE)

  • Deleting Data: The DELETE statement removes rows from a table.
    • DELETE FROM table_name WHERE condition: Deletes rows satisfying the specified conditions.

Displaying Unique Values (SELECT DISTINCT)

  • SELECT DISTINCT column1, column2, ... FROM table_name: Retrieves unique combinations of values from specified columns, eliminating duplicate rows.

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