PHP MySQL Basic Test

MySQL is a widely used relational database management system that is compatible with various operating systems. It can run on Unix, Linux, Windows, and other operating systems. This makes it a versatile choice for different environments and allows users to choose the operating system that best suits their needs.

PHP is a server-side scripting language, which means that it is executed on the server before the webpage is sent to the client's browser. This allows PHP to interact with databases, process form data, and generate dynamic content on the server before sending it to the user. Unlike client-side scripting languages like JavaScript, PHP code cannot be viewed or modified by the client, making it more secure for handling sensitive data and server-side operations. Therefore, the correct answer is "Server Side".

The INSERT statement is used to add a row to a table in a database. It allows the user to specify the values for each column in the new row, or to select values from another table to insert. The ALTER statement is used to modify the structure of a table, such as adding or removing columns, but it does not add rows. The ADD statement is not a valid SQL statement. The UPDATE statement is used to modify existing rows in a table, but it does not add new rows. Therefore, the correct answer is INSERT.

Transactions in SQL are used to ensure that a set of SQL statements are executed as a single, indivisible unit. This means that either all the statements within the transaction are successfully executed, or none of them are executed at all. This helps maintain data integrity and consistency in the database. By treating a set of SQL statements atomically, transactions allow for rollback and recovery in case of failures or errors during the execution of the statements. Therefore, the given answer "True" is correct.

The correct answer is mysql_connect() function. This function is used in PHP to establish a connection with a MySQL database. It takes parameters such as server name, username, password, and database name to establish the connection. Once the connection is established, it allows PHP to interact with the MySQL database and perform various operations such as querying, inserting, updating, and deleting data.

The DROP TABLE statement is used to delete a table.

SQL is not case sensitive, meaning that the keywords and identifiers in SQL statements can be written in any case and will be treated the same. In this case, "SELECT" and "select" are considered equivalent and will produce the same result. Therefore, the statement "SQL is not case sensitive. SELECT is the same as select" is true.

The given statement is incorrect. In a database, a primary key does not allow null values, while a unique key does allow null values. A primary key is a column or a combination of columns that uniquely identifies each row in a table. It is used to enforce data integrity and ensure uniqueness. On the other hand, a unique key also enforces uniqueness but allows null values.

PHP, MySQL, and Linux are all examples of open source technologies. Open source refers to software that is freely available to use, modify, and distribute. PHP is a popular scripting language used for web development, MySQL is a widely used open source database management system, and Linux is an open source operating system. These technologies have a large community of developers who contribute to their improvement and provide support, making them accessible and customizable for users. ASP.Net, on the other hand, is a Microsoft framework and is not open source.

The given list includes DML (Data Manipulation Language) commands, which are used to manipulate data in a database. "Update" is a DML command that allows modifying existing data in a table, while "select" is used to retrieve data from a table. Therefore, both "update" and "select" are correct answers as they are valid DML commands.