What are the three different functions used for inserting data into the database based on certain conditions?

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In the field of database management, there are various functions that can be used to insert data into a database based on certain conditions. These functions provide flexibility and control over the data insertion process, allowing for efficient and accurate management of the database. In this answer, we will discuss three different functions commonly used for inserting data into a database based on certain conditions.

1. INSERT INTO statement: The INSERT INTO statement is a widely used function in SQL (Structured Query Language) for inserting data into a database table. It allows you to specify the table name, columns, and values to be inserted. This function is typically used when you want to insert data into a table without any conditions. Here is an example of how the INSERT INTO statement can be used:

sql
   INSERT INTO employees (id, name, age, salary)
   VALUES (1, 'John Doe', 30, 50000);

In this example, the data is being inserted into the "employees" table, and the values for the "id", "name", "age", and "salary" columns are provided.

2. INSERT INTO SELECT statement: The INSERT INTO SELECT statement is another powerful function in SQL that allows you to insert data into a table based on certain conditions. It enables you to select data from one or more tables and insert it into another table. This function is useful when you want to insert data into a table based on a specific condition or criteria. Here is an example of how the INSERT INTO SELECT statement can be used:

sql
   INSERT INTO employees_new (id, name, age, salary)
   SELECT id, name, age, salary
   FROM employees
   WHERE age > 30;

In this example, the data is being inserted into the "employees_new" table based on the condition that the age of the employees is greater than 30. The data is selected from the "employees" table.

3. INSERT INTO…ON DUPLICATE KEY UPDATE statement: The INSERT INTO…ON DUPLICATE KEY UPDATE statement is a unique function in SQL that allows you to insert data into a table based on certain conditions and update the existing data if a duplicate key is found. This function is helpful when you want to insert new data into a table but update the existing data if a duplicate key is encountered. Here is an example of how the INSERT INTO…ON DUPLICATE KEY UPDATE statement can be used:

sql
   INSERT INTO employees (id, name, age, salary)
   VALUES (1, 'John Doe', 30, 50000)
   ON DUPLICATE KEY UPDATE name = 'Jane Doe', age = 31, salary = 55000;

In this example, the data is being inserted into the "employees" table. If a duplicate key is found (in this case, the "id" column), the existing data for the duplicate key will be updated with the specified values.

These three functions provide different ways to insert data into a database based on certain conditions. The choice of function depends on the specific requirements of the database and the conditions that need to be met during the data insertion process. By utilizing these functions effectively, you can ensure accurate and efficient management of your database.

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