Update multiple rows in same query using PostgreSQL

Updating Multiple Rows in One Go Using PostgreSQL 💪

Updating multiple rows in PostgreSQL can be a bit tricky, but fear not! We've got you covered with easy solutions to this common problem. In this blog post, we'll explore how you can update multiple rows in one statement using PostgreSQL, saving you time and effort. 🚀

The Challenge ⚡️

Let's start by understanding the challenge at hand. You want to update multiple rows in a single query, but the syntax you provided in your question is not quite right. Unfortunately, PostgreSQL doesn't support updating multiple rows using a single set of SET statements like that.

The Solution ✔️

Don't worry! PostgreSQL provides us with a powerful feature called the CASE expression, which we can leverage to update multiple rows at once. Here's how you can achieve this:

UPDATE table 
SET 
  column_a = CASE 
               WHEN column_b = '123' THEN 1
               WHEN column_b = '345' THEN 2
               ELSE column_a
             END
WHERE 
  column_b IN ('123', '345');

Let's break down this solution:

1. We use the CASE expression within the SET statement to conditionally update the column_a value.

2. Each WHEN clause checks the value of column_b and sets column_a accordingly.

3. The ELSE clause ensures that column_a remains unchanged if none of the specified conditions are met.

4. The WHERE clause specifies which rows to update by filtering on the values of column_b.

You can customize the conditions and values according to your specific requirements. 🛠️

Test Drive 🚗

To better understand how this works, let's assume we have the following table called "employees":

| id | name   | salary |
|----|--------|--------|
| 1  | Alice  | 3000   |
| 2  | Bob    | 2500   |
| 3  | Charlie| 2000   |

We want to update the salaries of Alice and Charlie. Here's how our query would look like:

UPDATE employees
SET
  salary = CASE
             WHEN name = 'Alice'   THEN 3500
             WHEN name = 'Charlie' THEN 2200
             ELSE salary
           END
WHERE
  name IN ('Alice', 'Charlie');

After executing this query, our updated table would look like this:

| id | name   | salary |
|----|--------|--------|
| 1  | Alice  | 3500   |
| 2  | Bob    | 2500   |
| 3  | Charlie| 2200   |

Hooray! We successfully updated multiple rows using a single query. 👏

Take It to the Next Level 👩‍💻

Now that you've learned how to update multiple rows in one go using PostgreSQL, the possibilities are endless. You can apply this technique to a wide range of scenarios, from simple updates to more complex conditional modifications. 🌟

So go ahead and unleash the power of PostgreSQL with multiple row updates! If you have any questions or face any issues, feel free to leave a comment below. Happy coding! 😄💻

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*[CASE]: A syntax structure in SQL that allows conditional evaluations and execution of code blocks. *[SET]: A keyword used in SQL to assign new values to database columns. *[WHERE]: A clause used to filter specific rows in a SQL statement.