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SQL PUZZLE | Multiple ways to add leading zero to single digit month | SQL Interview Question

In this puzzle you have to extract the month from the dt column and then append zero single digit month if any. Please check out sample input and expected output.

Sample Input

Id Dt
1 2018-04-06 11:06:43.020
2 2017-12-06 11:06:43.020
3 2016-01-06 11:06:43.020
4 2015-11-06 11:06:43.020
5 2014-10-06 11:06:43.020

Expected output

Id Dt MonthPrefixedWithZero
1 2018-04-06 11:06:43.020 04
2 2017-12-06 11:06:43.020 12
3 2016-01-06 11:06:43.020 01
4 2015-11-06 11:06:43.020 11
5 2014-10-06 11:06:43.020 10

Script – DDL and INSERT sample data

--

CREATE TABLE Dates
(
	 Id INT
	,Dt DATETIME
)
GO

INSERT INTO Dates VALUES
(1,'2018-04-06 11:06:43.020'),
(2,'2017-12-06 11:06:43.020'),
(3,'2016-01-06 11:06:43.020'),
(4,'2015-11-06 11:06:43.020'),
(5,'2014-10-06 11:06:43.020')
GO

SELECT * FROM Dates
GO

--

SOLUTION – 1

--

SELECT * , RIGHT(CONCAT('0',MONTH(Dt)),2) [MonthPrefixedWithZero] 
FROM Dates
GO

--

OUTPUT – 1

--

Id          Dt                      MonthPrefixedWithZero
----------- ----------------------- ---------------------
1           2018-04-06 11:06:43.020 04
2           2017-12-06 11:06:43.020 12
3           2016-01-06 11:06:43.020 01
4           2015-11-06 11:06:43.020 11
5           2014-10-06 11:06:43.020 10

(5 rows affected)

--

SOLUTION – 2

--

SELECT * , RIGHT('0' + CAST(DATEPART(mm, Dt) AS varchar(2)), 2) [MonthPrefixedWithZero]
FROM Dates
GO

--

OUTPUT – 2

--

Id          Dt                      MonthPrefixedWithZero
----------- ----------------------- ---------------------
1           2018-04-06 11:06:43.020 04
2           2017-12-06 11:06:43.020 12
3           2016-01-06 11:06:43.020 01
4           2015-11-06 11:06:43.020 11
5           2014-10-06 11:06:43.020 10

(5 rows affected)

--

SOLUTION – 3

--

SELECT * , CONVERT(VARCHAR(2), Dt, 101) [MonthPrefixedWithZero]
FROM Dates
GO


--

OUTPUT – 3

--

Id          Dt                      MonthPrefixedWithZero
----------- ----------------------- ---------------------
1           2018-04-06 11:06:43.020 04
2           2017-12-06 11:06:43.020 12
3           2016-01-06 11:06:43.020 01
4           2015-11-06 11:06:43.020 11
5           2014-10-06 11:06:43.020 10

(5 rows affected)

--

SOLUTION – 4

--

SELECT * , CASE WHEN MONTH(Dt) < 10 THEN CONCAT('0' , MONTH(GETDATE()))
           ELSE CONCAT(NULL,MONTH(Dt)) END [MonthPrefixedWithZero]
FROM Dates
GO

--

OUTPUT – 4

--

Id          Dt                      MonthPrefixedWithZero
----------- ----------------------- ---------------------
1           2018-04-06 11:06:43.020 04
2           2017-12-06 11:06:43.020 12
3           2016-01-06 11:06:43.020 04
4           2015-11-06 11:06:43.020 11
5           2014-10-06 11:06:43.020 10

(5 rows affected)

--

Enjoy 🙂

Please add comment(s) if you have one or multiple solutions in mind. Thank You.

Pawan Khowal

Pawan is a SQL Server Developer. If you need any help in writing code/puzzle or training please email at – pawankkmr”AT”gmail.com. Meanwhile please go throgh the top pages from his blog.

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