Connecting to Databases with MySQL
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Connecting to Databases with MySQL

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Questions and Answers

What is the purpose of the mysql_select_db function in PHP?

  • To list all databases on a server
  • To create a new database
  • To delete a database
  • To select a database for operations (correct)

    • What should you do when creating tables in a new database using PHP?

  • Execute an SQL query using mysql_query (correct)
  • Select an existing table to create a new one
  • Use an implicit command to create tables
  • Use mysql_create_table function directly

    • What is a crucial consideration when deleting a database table?

  • Ensure that no other tables are dependent on it (correct)
  • The operation can only be done with admin privileges
  • You can always recover it afterwards
  • It will automatically delete the entire database

    • How can data be entered into a MySQL table using PHP?

    <p>By executing an SQL INSERT with mysql_query</p> Signup and view all the answers

    Which SQL command is needed to permanently remove a MySQL database?

    <p>DROP DATABASE</p> Signup and view all the answers

    What SQL command is used to create a new database?

    <p>CREATE DATABASE database_name;</p> Signup and view all the answers

    Which command would you use to see the entire contents of a table?

    <p>SELECT * FROM table_name;</p> Signup and view all the answers

    What is the purpose of the ALTER TABLE command?

    <p>To add or modify columns in a table</p> Signup and view all the answers

    To see the structure of a specific table in MySQL, which command should be used?

    <p>DESCRIBE table_name;</p> Signup and view all the answers

    Which command will successfully delete a specific record from a table?

    <p>DELETE FROM table_name WHERE column_name=field_text;</p> Signup and view all the answers

    What is the correct command to insert a new record in the table named 'stuTab'?

    <p>INSERT INTO stuTab (id, name, address, mobile) VALUES (01, 'John', 'America', '098765431');</p> Signup and view all the answers

    Which command will update the name of a record in 'stuTab' where id is '01'?

    <p>UPDATE stuTab SET name = 'John Mc' WHERE id = '01';</p> Signup and view all the answers

    What is the correct SQL statement to create the Mytable in the Mydatabase with the specified fields?

    <p>CREATE TABLE Mytable (Stu_ID int(4) NOT NULL, Firstname char(15) NOT NULL, Lastname char(15) NULL, Address varchar(50), Email varchar(30), mobile int(10));</p> Signup and view all the answers

    What does the MySQL command 'DROP DATABASE database_name;' do?

    <p>Deletes the specified database and all its contents</p> Signup and view all the answers

    Which SQL command is used to add a new column grade after the mobile column in Mytable?

    <p>ALTER TABLE Mytable ADD COLUMN grade INT AFTER mobile;</p> Signup and view all the answers

    Which PHP function is used to close the database connection in MySQL?

    <p>mysql_close();</p> Signup and view all the answers

    What is the function used to create and delete a database in MySQL?

    <p>mysql_query();</p> Signup and view all the answers

    How can you modify the column names in Mytable from Firstname to fname and Lastname to lname?

    <p>ALTER TABLE Mytable CHANGE Firstname fname char(15), CHANGE Lastname lname char(15);</p> Signup and view all the answers

    What type of value should the mobile column in Mytable store?

    <p>int(10);</p> Signup and view all the answers

    What should you do to permanently remove the primary key constraint from Mytable?

    <p>ALTER TABLE Mytable DROP PRIMARY KEY;</p> Signup and view all the answers

    How many rows of data should be entered into Mytable according to the exercise?

    <p>Four rows;</p> Signup and view all the answers

    Study Notes

    Connecting to Databases

    • What is a database? A database is a separate application that stores a collection of data. It has APIs for creating, accessing, managing, searching, and replicating data.
    • MySQL Database
      • A fast, easy-to-use RDBMS popular with large and small businesses
      • Developed, marketed, and supported by MySQL AB (a Swedish company)
    • Commands:
      • SHOW DATABASES: Displays all existing databases.
      • CREATE DATABASE database_name: Creates a new database with the specified name.
      • DROP DATABASE database_name: Deletes the specified database.
      • USE database_name: Selects the specified database for use.
      • SHOW TABLES: Displays all tables within the currently selected database.
      • CREATE TABLE table_name (column_name data_type, ...): Creates a new table with specified columns and data types.
      • DESCRIBE table_name: Displays the structure of the specified table.
      • SELECT * FROM table_name: Retrieves all data from the specified table.
      • INSERT INTO table_name (column_name, ...) VALUES (value1, ...): Inserts data into the specified table.
      • UPDATE table_name SET column_name = value WHERE condition: Updates the specified column(s) in the table based on the provided condition.
      • DELETE FROM table_name WHERE condition: Deletes rows from the specified table based on the provided condition.
      • ALTER TABLE table_name ADD column_name data_type: Adds a new column to the specified table.
      • ALTER TABLE table_name MODIFY column_name data_type: Modifies the data type of a column in the specified table.
      • ALTER TABLE table_name DROP column_name: Deletes a column from the specified table.

    Connecting to MySQL Database Using PHP

    • mysql_connect(): Opens a database connection. It takes five parameters and returns a MySQL link identifier on success or FALSE on failure.
    • mysql_close(): Closes a database connection. It takes a connection resource returned by mysql_connect() and returns TRUE on success or FALSE on failure.
    • mysql_query(): Executes an SQL query. It takes the SQL query and a connection resource as parameters and returns TRUE on success or FALSE on failure.

    Creating a MySQL Database Using PHP

    • mysql_query("CREATE DATABASE database_name"): Creates a new database. Requires admin privileges.
    • mysql_select_db(): Selects a database to work with.

    Deleting a MySQL Database Using PHP

    • mysql_query("DROP DATABASE database_name"): Deletes a database. Requires admin privileges.

    Deleting a MySQL Table Using PHP

    • mysql_query("DROP TABLE table_name"): Deletes a table. Exercise caution as this permanently removes the table and its data.

    Inserting Data into a MySQL Database Using PHP

    • mysql_query("INSERT INTO table_name (column_name, ...) VALUES (value1, ...)"): Inserts data into a table.

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    Related Documents

    Chapter 5.docx.pdf

    Description

    This quiz covers the basics of databases, focusing on MySQL as a relational database management system (RDBMS). Test your knowledge of essential commands and concepts related to creating, accessing, and managing databases and tables in MySQL.

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