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Questions and Answers
What is the purpose of the mysql_select_db function in PHP?
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?
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?
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?
How can data be entered into a MySQL table using PHP?
Which SQL command is needed to permanently remove a MySQL database?
Which SQL command is needed to permanently remove a MySQL database?
What SQL command is used to create a new database?
What SQL command is used to create a new database?
Which command would you use to see the entire contents of a table?
Which command would you use to see the entire contents of a table?
What is the purpose of the ALTER TABLE command?
What is the purpose of the ALTER TABLE command?
To see the structure of a specific table in MySQL, which command should be used?
To see the structure of a specific table in MySQL, which command should be used?
Which command will successfully delete a specific record from a table?
Which command will successfully delete a specific record from a table?
What is the correct command to insert a new record in the table named 'stuTab'?
What is the correct command to insert a new record in the table named 'stuTab'?
Which command will update the name of a record in 'stuTab' where id is '01'?
Which command will update the name of a record in 'stuTab' where id is '01'?
What is the correct SQL statement to create the Mytable in the Mydatabase with the specified fields?
What is the correct SQL statement to create the Mytable in the Mydatabase with the specified fields?
What does the MySQL command 'DROP DATABASE database_name;' do?
What does the MySQL command 'DROP DATABASE database_name;' do?
Which SQL command is used to add a new column grade after the mobile column in Mytable?
Which SQL command is used to add a new column grade after the mobile column in Mytable?
Which PHP function is used to close the database connection in MySQL?
Which PHP function is used to close the database connection in MySQL?
What is the function used to create and delete a database in MySQL?
What is the function used to create and delete a database in MySQL?
How can you modify the column names in Mytable from Firstname to fname and Lastname to lname?
How can you modify the column names in Mytable from Firstname to fname and Lastname to lname?
What type of value should the mobile column in Mytable store?
What type of value should the mobile column in Mytable store?
What should you do to permanently remove the primary key constraint from Mytable?
What should you do to permanently remove the primary key constraint from Mytable?
How many rows of data should be entered into Mytable according to the exercise?
How many rows of data should be entered into Mytable according to the exercise?
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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 bymysql_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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