﻿ SQL: Employees retiring after 31-Dec-99 after 8 years

# SQL Exercise: Employees retiring after 31-Dec-99 after 8 years

## SQL employee Database: Exercise-30 with Solution

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30. From the following table, write a SQL query to identify those employees who retired after 31-Dec-99, completing eight years of service. Return employee name.

Sample table: employees

Pictorial Presentation:

Sample Solution:

``````SELECT emp_name
FROM employees
WHERE hire_date + interval '96 months' > '1999-12-31';
``````

Sample Output:

``` emp_name
--------------
MARKER
SCARLET
(3 rows)
```

Explanation:

The said query in SQL that selects the "emp_name" column from the "employees" table who were hired after December 31st, 1999.

The WHER clause filters the result set for the "hire_date" column plus 96 months (or 8 years) is greater than December 31st, 1999.

## Practice Online

Sample Database: employee

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Previous SQL Exercise: Employees who earn more than 100 as daily salary.
Next SQL Exercise: List those employees whose salary is an odd value.

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## SQL: Tips of the Day

Concatenate strings of a string field in a PostgreSQL 'group by' query:

Input:

```ID   COMPANY_ID   EMPLOYEE
1    1            Anna
2    1            Bill
3    2            Carol
4    2            Dave
```
```SELECT company_id, string_agg(employee, ', ')
FROM mytable
GROUP BY company_id;
```

Output:

```COMPANY_ID   EMPLOYEE
1            Anna, Bill
2            Carol, Dave
```

Database: PostgreSQL

Ref: https://bit.ly/2XTiRjq

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