What does the "Update" operation in CRUD involve in Java?Question 15Answera.Deleting datab.Modifying existing datac.Inserting new datad.Retrieving data

Understanding the "Update" Operation in CRUD

The "Update" operation in CRUD (Create, Read, Update, Delete) refers specifically to modifying existing data in a database. This operation is essential in applications that require the ability to change data records after they have been created.

1. Defining CRUD:

   • Create: Refers to the ability to insert new data into the database.
   • Read: Involves retrieving and reading existing data from the database.
   • Update: This operation modifies the current data records.
   • Delete: Refers to removing existing data from the database.

2. Implications of Update:

   • The update operation will typically involve identifying the record to be modified using a unique identifier (like a primary key).
   • It will also require providing the new data values that need to replace the existing ones.
   • In Java, this can be done using database management tools like JDBC to execute SQL statements for updating records.

3. Implementation:

   • In a Java application, an update operation might look like this:

     String updateQuery = "UPDATE tableName SET column1 = value1, column2 = value2 WHERE condition";
     

   • This command modifies the specified columns for records that satisfy the given condition in the database.

Final Answer

Thus, the correct answer to the question about what the "Update" operation in CRUD involves is b. Modifying existing data.