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SQL Exercise: Six-character employee names with R in 3rd position

SQL employee Database: Exercise-106 with Solution

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106. From the following table, write a SQL query to find those employees whose name is six characters in length and the third character must be 'R'. Return complete information about the employees.

Sample table: employees


Sample Solution:

SELECT *
FROM employees
WHERE length(emp_name)=6
  AND emp_name LIKE '__R%';

Sample Output:

 emp_id | emp_name | job_name | manager_id | hire_date  | salary  | commission | dep_id
--------+----------+----------+------------+------------+---------+------------+--------
  69324 | MARKER   | CLERK    |      67832 | 1992-01-23 | 1400.00 |            |   1001
(1 row)

Explanation:

The said query in SQL that selects all columns of employees whose names have a length of 6 characters and start with any two characters, followed by the letter 'R' from the 'employees' table.

With the WHERE clause, the length() function will check if the emp_name has exactly 6 characters, and the LIKE operator will match any two characters following 'R'.

Practice Online


Sample Database: employee

employee database structure

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Previous SQL Exercise: List the names of those employees starting with A.
Next SQL Exercise: Employee start with 'A' and end with 'N', length six.

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SQL: Tips of the Day

Grouped LIMIT in PostgreSQL: Show the first N rows for each group?

db=# SELECT * FROM xxx;
 id | section_id | name
----+------------+------
  1 |          1 | A
  2 |          1 | B
  3 |          1 | C
  4 |          1 | D
  5 |          2 | E
  6 |          2 | F
  7 |          3 | G
  8 |          2 | H
(8 rows)

I need the first 2 rows (ordered by name) for each section_id, i.e. a result similar to:

id | section_id | name
----+------------+------
  1 |          1 | A
  2 |          1 | B
  5 |          2 | E
  6 |          2 | F
  7 |          3 | G
(5 rows)

PostgreSQL v9.3 you can do a lateral join

select distinct t_outer.section_id, t_top.id, t_top.name from t t_outer
join lateral (
    select * from t t_inner
    where t_inner.section_id = t_outer.section_id
    order by t_inner.name
    limit 2
) t_top on true
order by t_outer.section_id;

Database: PostgreSQL

Ref: https://bit.ly/3AfYwZI

 

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