SQL exercises on employee Database: Display the number of employee for each job in each department
SQL employee Database: Exercise-97 with Solution
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97. From the following table, write a SQL query to count the number of employees of each designation in each department. Return department id, job name and number of employees.
Sample table: employees
Sample Solution:
SELECT dep_id,
job_name,
count(*)
FROM employees
GROUP BY dep_id,
job_name;
Sample Output:
dep_id | job_name | count --------+-----------+------- 3001 | MANAGER | 1 2001 | ANALYST | 2 3001 | SALESMAN | 4 1001 | MANAGER | 1 1001 | PRESIDENT | 1 2001 | MANAGER | 1 2001 | CLERK | 2 1001 | CLERK | 1 3001 | CLERK | 1 (9 rows)
Relational Algebra Expression:
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Sample Database: employee
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Previous: From the following table, write a SQL query to list the managers and number of employees work under them. Sort the result set in ascending order on manager. Return manager ID and number of employees under them.
Next: From the following table, write a SQL query to find those departments where at least two employees work. Return department id, number of 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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