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How Do You Insert Data into an Existing Table in Oracle?

Published in Database Management 2 mins read

You can insert data into an existing table in Oracle using the INSERT statement. This statement allows you to add new rows of data to your table.

Syntax:

INSERT INTO table_name (column1, column2, ...)
VALUES (value1, value2, ...);
  • table_name: The name of the table you want to insert data into.
  • column1, column2, ...: The list of columns you want to insert data into. You can specify all or only a subset of the columns.
  • value1, value2, ...: The values you want to insert into the corresponding columns. The number of values must match the number of columns specified.

Examples:

1. Inserting data into all columns:

INSERT INTO employees (employee_id, first_name, last_name, salary)
VALUES (100, 'John', 'Doe', 60000);

This statement inserts a new row into the employees table with the specified values for all columns.

2. Inserting data into specific columns:

INSERT INTO employees (first_name, last_name, salary)
VALUES ('Jane', 'Smith', 55000);

This statement inserts a new row into the employees table, but only specifies values for the first_name, last_name, and salary columns. The employee_id column will be assigned the next available value by Oracle.

3. Inserting data from another table:

INSERT INTO employees (first_name, last_name, salary)
SELECT first_name, last_name, salary
FROM temp_employees;

This statement inserts data from the temp_employees table into the employees table. The SELECT statement specifies the columns and data to be inserted.

Tips and Best Practices:

  • Always verify the data types of the columns you are inserting into.
  • Use placeholders for values to prevent SQL injection vulnerabilities.
  • Consider using a transaction to ensure data integrity when inserting large volumes of data.

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