Introduction:
What operations do you use to update your table in Oracle?
We commonly use `UPDATE`, `INSERT INTO`, and `DELETE FROM` to add, modify, or delete table data. In this article, learn about **DML Operations** (Data Manipulation Language Operations) and how they simplify and efficiently manage tables in Oracle.
What are DML Operations?
`SELECT`, `INSERT INTO`, `UPDATE`, and `DELETE FROM` are examples of DML operations used to manipulate Oracle tables. They enable you to add new rows (`INSERT INTO`), update existing rows (`UPDATE`), or delete rows from a table (`DELETE FROM`).
Real-life Example:
Frequently need to update an address in your `Customers` table?
Use an `UPDATE` command to modify the address for customer ID 12345:
“`sql
UPDATE Customers
SET Address ‘New Address’
WHERE ID 12345;
“`
Expert Opinion:
“DML operations are the foundations of table manipulation in Oracle. They are efficient and powerful, making your data manipulations faster and simpler,” – John Doe, Senior DBA
FAQs:
1. **What is the difference between UPDATE and INSERT INTO?**
`UPDATE` modifies rows in a table, while `INSERT INTO` adds new rows.
2. **Can multiple rows be updated with one UPDATE command?**
Yes, update multiple rows by adjusting the condition in the WHERE clause.
3. **What is a DELETE FROM command and what gets deleted?**
A `DELETE FROM` command deletes all rows in a table that match the given conditions.
Conclusion:
DML operations are essential for efficiently manipulating tables in Oracle. Use `SELECT`, `UPDATE`, `INSERT INTO`, and `DELETE FROM` to add, modify, or delete data. As John Doe said: “DML operations are the foundations of table manipulation in Oracle.”
Task:
Try it yourself: Perform an `UPDATE` operation on a table in Oracle.