SQL Exercises: Count the number of employees in each department along with the department code
SQL Aggregate Functions: Exercise-25 with Solution
From the following table, write a SQL query to count the number of employees in each department. Return department code and number of employees.
Sample table: emp_details
Sample Solution:
SELECT emp_dept, COUNT(*)
FROM emp_details
GROUP BY emp_dept;
Output of the Query:
emp_dept count 27 2 57 5 47 3 63 3
Relational Algebra Expression:
Relational Algebra Tree:
Practice Online
Query Visualization:
Duration:
Rows:
Cost:
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Previous: From the following table, write a SQL query to compute the sum of the allotment amount of all departments. Return sum of the allotment amount.
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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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