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SQL Exercise: Without the spaces, count each employee name characters

SQL employee Database: Exercise-8 with Solution

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8. From the following table, write a SQL query to count the number of characters except the spaces for each employee name. Return employee name length.

Sample table: employees


Pictorial Presentation:

SQL exercises on employee Database: Count the no. of characters with out considering the spaces for each name

Sample Solution:

SELECT length(trim(emp_name))
FROM employees;

Sample Output:

 length
--------
      7
      5
      5
      5
      7
      5
      8
      6
      4
      6
      6
      6
      6
      6
(14 rows)

Explanation:

The given query in SQL that selects the length of the trimmed employee names for all rows in the 'employees' table.

In the "trim" function, leading or trailing spaces are removed from the employee name, and the "length" function returns the length.

Practice Online


Sample Database: employee

employee database structure

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Previous SQL Exercise: Employees with Hiredate in format February 22, 1991.
Next SQL Exercise: List employees id, salary, and commission.

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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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