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SQL Puzzle | The Single Update Statement Puzzle
Recently I have attended an Interview, there I was asked this question. Here the challenge was to Update the table using single update statement. So we have a hierarchy table called “Employees” where we have employees and their managers. Here of the employee Jasleen has resigned and they have hired a new manager “Ramesh”. Now we have to update EmployeeName and ManagerName column values from Jasleen to Ramesh at one time since it is a hierarchy table. The challenge here is to do this in a single update statement.
Please check out the sample input values and expected output below.
Use below script to create table and insert sample data into it.
-- CREATE TABLE Employees ( ID INT IDENTITY(1,1) PRIMARY KEY ,EmployeeName VARCHAR(50) ,ManagerName VARCHAR(50) ,Salary DECIMAL (10,3) ) GO INSERT INTO Employees VALUES ('Joteep' ,NULL, 1000.00 ), ('Pawan' ,'Joteep', 900.00), ('Jasleen', 'Joteep' ,900.00), ('Deepak' ,'Jasleen' ,800.00), ('Sandeep', 'Jasleen' ,700.00), ('Mayank' ,'Jasleen' ,600.00) GO --
The solution should be should use “SELECT” statement or “CTE”.
Add your solution(s) in the comments section or send you solution(s) to email@example.com
SOLUTION 1 | Using 2 Update Statements
-- SELECT * FROM Employees GO BEGIN TRAN UPDATE Employees SET EmployeeName = 'Ramesh' WHERE EmployeeName = 'Jasleen' UPDATE Employees SET ManagerName = 'Ramesh' WHERE ManagerName = 'Jasleen' COMMIT SELECT * FROM Employees GO --
Add a comment if you have any other solution in mind. I would love to learn it. We all need to learn.
Enjoy !!! Keep Learning
Gaurav Lal said:
EmployeeName = (CASE EmployeeName WHEN ‘Jasleen’ THEN ‘Ramesh’ ELSE EmployeeName END),
ManagerName = (CASE ManagerName WHEN ‘Jasleen’ THEN ‘Ramesh’ ELSE ManagerName END)
FROM Employees e
WHERE (e.EmployeeName = ‘Jasleen’ OR e.ManagerName = ‘Jasleen’)
Pawan Kumar Khowal said:
Excellent bro !!