SQL Exercise: Produce the output of employees
SQL employee Database: Exercise-6 with Solution
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6. Write a query in SQL to produce the output of employees as follows:
Sample table: employees
SELECT emp_name || '('|| lower(job_name)||')' AS "Employee" FROM employees;
Employee -------------------- KAYLING(president) BLAZE(manager) CLARE(manager) JONAS(manager) SCARLET(analyst) FRANK(analyst) SANDRINE(clerk) ADELYN(salesman) WADE(salesman) MADDEN(salesman) TUCKER(salesman) ADNRES(clerk) JULIUS(clerk) MARKER(clerk) (14 rows)
The said query in SQL that retrieves a result set that includes a list of concatenated strings, where each string represents an employee name and job name enclosed in parentheses and with the job name in lowercase.
The concatenation is performed using the concatenation operator || and a string literal '(' and ')', with the lower() function used to convert the "job_name" to lowercase and the AS keyword assigns the name "Employee" to the newly created column.
Sample Database: employee
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Previous SQL Exercise: Produce the output of employees name and job name.
Next SQL Exercise: Employees with Hire date in format February 22, 1991.
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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;
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