SQL subqueries on employee Database: List the department ID and their average salaries for those department where the average salary is less than the averages for all departments
SQL subqueries on employee Database: Exercise-58 with Solution
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58. From the following table, write a SQL query to find those departments where the average salary is less than the averages for all departments. Return department ID, average salary.
Sample table: employees
Sample Solution:
SELECT dep_id,
avg(salary)
FROM employees
GROUP BY dep_id
HAVING avg(salary) <
(SELECT avg(salary)
FROM employees);
Sample Output:
dep_id | avg --------+----------------------- 3001 | 1633.3333333333333333 (1 row)
Practice Online
Structure of employee Database:
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Previous: From the following table, write a SQL query to find those employees who gets a commission and earn the second highest net salary (salary + commission). Return department id, employee name, designation, salary, and net salary.
Next: From the following tables, write a SQL query to find the unique department of the employees. Return complete information about the employees.
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SQL: Tips of the Day
SQL Server SELECT into existing table.
INSERT INTO dbo.TABLETWO SELECT col1, col2 FROM dbo.TABLEONE WHERE col3 LIKE @search_key
This assumes there's only two columns in dbo.TABLETWO - you need to specify the columns otherwise:
INSERT INTO dbo.TABLETWO (col1, col2) SELECT col1, col2 FROM dbo.TABLEONE WHERE col3 LIKE @search_key
Database: SQL Server
Ref: https://bit.ly/3y6tpA3
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