﻿ SQL: List id, name, department id, location of all employees

# SQL Exercise: List id, name, department id, location of all employees

## SQL employee Database: Exercise-93 with Solution

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93. From the following table, write a SQL query to list the employee id, name, department id, location of all the employees.

Sample table: employees

Sample table: department

Sample Solution:

``````SELECT e.emp_id,
e.emp_name,
e.dep_id,
d.dep_location
FROM employees e,
department d
WHERE e.dep_id = d.dep_id ;
``````

Sample Output:

``` emp_id | emp_name | dep_id | dep_location
--------+----------+--------+--------------
68319 | KAYLING  |   1001 | SYDNEY
66928 | BLAZE    |   3001 | PERTH
67832 | CLARE    |   1001 | SYDNEY
65646 | JONAS    |   2001 | MELBOURNE
67858 | SCARLET  |   2001 | MELBOURNE
69062 | FRANK    |   2001 | MELBOURNE
63679 | SANDRINE |   2001 | MELBOURNE
64989 | ADELYN   |   3001 | PERTH
65271 | WADE     |   3001 | PERTH
66564 | MADDEN   |   3001 | PERTH
68454 | TUCKER   |   3001 | PERTH
68736 | ADNRES   |   2001 | MELBOURNE
69000 | JULIUS   |   3001 | PERTH
69324 | MARKER   |   1001 | SYDNEY
(14 rows)
```

Explanation:

The said query in SQL that selects the emp_id, emp_name, dep_id from the employees table and the dep_location from the department table. The query joins the two tables on the dep_id column where they have the same values.

Relational Algebra Expression:

Relational Algebra Tree:

## Practice Online

Sample Database: employee

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Previous SQL Exercise: Compute the total salary for each job in 1991.
Next SQL Exercise: List employee id of all the departments 1001 and 2001.

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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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