Sure, here is a step-by-step guide on how to create a PL/pgSQL block that defines a procedure named `update_employee_salary`:

1. Open your PostgreSQL database interface.

2. Start by defining the procedure. In PostgreSQL, you use the `CREATE OR REPLACE PROCEDURE` statement to create a new procedure or replace an existing one.

3. Specify the name of the procedure, which in this case is `update_employee_salary`.

4. Define the parameters that the procedure will take. In this case, it's `employee_id` and `new_salary`.

5. Use the `LANGUAGE` clause to specify the language name that the procedure is implemented in. In this case, it's `plpgsql`.

6. Use the `AS` clause to provide the code block that implements the procedure. In this case, it's an `UPDATE` statement that updates the `salary` column of the `employee` table for the row that has the `eid` equal to the `employee_id` parameter.

Here is the SQL code that implements the above steps:

```sql
CREATE OR REPLACE PROCEDURE update_employee_salary(employee_id INT, new_salary NUMERIC)
LANGUAGE plpgsql
AS $$
BEGIN
UPDATE employee
SET salary = new_salary
WHERE eid = employee_id;
END;
$$;
```

To call this procedure, you would use the `CALL` statement like this:

```sql
CALL update_employee_salary(1, 50000);
```

This would update the salary of the employee with `eid` of 1 to 50000.

Question

Sure, here is a step-by-step guide on how to create a PL/pgSQL block that defines a procedure named `update_employee_salary`:

1. Open your PostgreSQL database interface.

2. Start by defining the procedure. In PostgreSQL, you use the `CREATE OR REPLACE PROCEDURE` statement to create a new procedure or replace an existing one.

3. Specify the name of the procedure, which in this case is `update_employee_salary`.

4. Define the parameters that the procedure will take. In this case, it's `employee_id` and `new_salary`.

5. Use the `LANGUAGE` clause to specify the language name that the procedure is implemented in. In this case, it's `plpgsql`.

6. Use the `AS` clause to provide the code block that implements the procedure. In this case, it's an `UPDATE` statement that updates the `salary` column of the `employee` table for the row that has the `eid` equal to the `employee_id` parameter.

Here is the SQL code that implements the above steps:

```sql
CREATE OR REPLACE PROCEDURE update_employee_salary(employee_id INT, new_salary NUMERIC)
LANGUAGE plpgsql
AS $$
BEGIN
   UPDATE employee
   SET salary = new_salary
   WHERE eid = employee_id;
END;
$$;
```

To call this procedure, you would use the `CALL` statement like this:

```sql
CALL update_employee_salary(1, 50000);
```

This would update the salary of the employee with `eid` of 1 to 50000.

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