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Questions and Answers
What is the purpose of the semicolon (';') in the provided content?
What is the purpose of the semicolon (';') in the provided content?
- To indicate the end of a SQL statement.
- To mark the end of a function in programming.
- To separate clauses in a sentence.
- To signal the end of a command in a database system. (correct)
- To separate different data entries in a table.
What does the term "Null" refer to in the context of a database table?
What does the term "Null" refer to in the context of a database table?
- A value representing a numerical zero.
- A value representing an empty string.
- A value that is not allowed to be entered in a database table.
- A value that is empty or undefined. (correct)
- A value that has not been initialized.
What is the significance of "Edit Top 200 Rows" option when right-clicking on a database table?
What is the significance of "Edit Top 200 Rows" option when right-clicking on a database table?
- It allows direct editing of the first 200 rows in the database.
- It displays a visual representation of the first 200 rows of the table.
- It opens a form to add or modify data into the first 200 rows of the table. (correct)
- It is the only way to insert data into a table that already exists in the database.
- It is the most efficient way to populate the first 200 rows with data.
Which of the following actions is performed before you can start entering data into a table?
Which of the following actions is performed before you can start entering data into a table?
What is the most likely reason why all data is displayed as "Null" when a newly created table is opened?
What is the most likely reason why all data is displayed as "Null" when a newly created table is opened?
In a SQL query, which clause specifies the table from which data should be retrieved?
In a SQL query, which clause specifies the table from which data should be retrieved?
Which clause in a SQL query is used to specify the columns (fields) that should be returned in the results?
Which clause in a SQL query is used to specify the columns (fields) that should be returned in the results?
What does the 'WHERE' clause do in a SQL query?
What does the 'WHERE' clause do in a SQL query?
The term 'Table' in the context of SQL refers to what?
The term 'Table' in the context of SQL refers to what?
Which of the following is NOT a valid SQL keyword?
Which of the following is NOT a valid SQL keyword?
Flashcards
Columns
Columns
The field or fields to retrieve from a table.
FROM
FROM
Used to specify the name of the table.
Table
Table
The name of the table to retrieve data from.
WHERE
WHERE
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Condition
Condition
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Semicolon
Semicolon
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Edit Top 200 Rows
Edit Top 200 Rows
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Null Value
Null Value
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Database Table
Database Table
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Right-click Menu
Right-click Menu
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Study Notes
Advanced Database Lecture 3
- SELECT Statement: Used to retrieve data from tables.
SELECT *: Returns all columns from a table.Columns: Specifies the column(s) to retrieve.FROM: Indicates the table to retrieve data from.Table: The name of the table.WHERE: Filters the data based on specified conditions.Conditions: Criteria for selecting specific rows.ORDER BY: Sorts the retrieved data.Column: The column used for sorting.
Inserting Data
INSERT INTO: Used to add new data to a table.Table_Name: The name of the target table.field0, field1, field2,...field N: Column names to insert values into.value0, value1, value2,...value N: Corresponding values to insert.NULL: Represents the absence of a value.
Retrieving Data using SELECT
SELECT * FROM Employee: Returns all columns from theEmployeetable.SELECT Emp_No, Emp_Name FROM Employee: Returns specific columns from theEmployeetable.SELECT Emp_No, Emp_Salary FROM Employee WHERE Emp_No=12: Selects specific columns and filters by a condition.SELECT * FROM Employee WHERE Emp_No=12: Returns all columns for a particular employee.SELECT DISTINCT: Returns unique values.SELECT DISTINCT Emp_Salary FROM Employee: Returns unique employee salaries.
Updating Data using UPDATE
UPDATE: Used to modify existing data in a table.SET: Specifies the columns and new values.WHERE: Filters the rows to be updated.UPDATE Employee SET Emp_Name = 'Areej', Emp_Salary = 2000 WHERE Emp_No=19: Changes name and salary for employee 19.UPDATEwithoutWHEREaffects all rows in the table -- use carefully.
Deleting Data using DELETE
DELETE FROM: Used to remove rows from a table.WHERE: Filters the rows to be deleted.DELETE FROM Employee WHERE Emp_Name = 'ahmed': Deletes rows whereEmp_Nameis 'ahmed'DELETE FROM table_name: Deletes all rows in the table (withoutWHEREclause).
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