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SQL Puzzle | Time spent by employee in an organization puzzle
In this puzzle we have two tables named tblEmployee and tblTransfer. An employee can transfer to many jobs in one or several sites.
Here we need to calculate the total time that an employee had spent in one particular site. In this specific case we need to find out how much employee 1 & 2 had spent in site 2 only.
Please check out the sample input values and sample expected output below.
Sample Input
table tblTransfere
empNo | empName | empHireDate | empHireSite | billet | retireDate |
---|---|---|---|---|---|
1 | ABC | 2000-05-12 00:00:00.000 | 1 | 1 | 2017-08-20 00:00:00.000 |
2 | EFG | 1998-10-11 00:00:00.000 | 2 | 2 | NULL |
3 | XYZ | 1985-03-24 00:00:00.000 | 1 | 3 | NULL |
table tblTransfere
empNo | trfFromSite | trfToSite | trfDate | trfBillet |
---|---|---|---|---|
1 | 1 | 2 | 2001-06-10 00:00:00.000 | 4 |
1 | 2 | 2 | 2003-01-10 00:00:00.000 | 5 |
1 | 2 | 2 | 2005-11-10 00:00:00.000 | 6 |
1 | 2 | 3 | 2010-06-25 00:00:00.000 | 7 |
1 | 3 | 2 | 2015-08-27 00:00:00.000 | 8 |
2 | 2 | 2 | 1998-10-11 00:00:00.000 | 9 |
2 | 2 | 2 | 2000-01-14 00:00:00.000 | 10 |
2 | 2 | 2 | 2002-11-07 00:00:00.000 | 11 |
2 | 2 | 3 | 2003-02-01 00:00:00.000 | 12 |
2 | 3 | 3 | 2005-09-07 00:00:00.000 | 13 |
2 | 3 | 1 | 2007-03-03 00:00:00.000 | 14 |
2 | 1 | 1 | 2008-09-28 00:00:00.000 | 15 |
2 | 1 | 1 | 2011-12-26 00:00:00.000 | 16 |
2 | 1 | 2 | 2013-01-06 00:00:00.000 | 17 |
2 | 2 | 2 | 2015-04-06 00:00:00.000 | 18 |
2 | 2 | 1 | 2016-11-07 00:00:00.000 | 19 |
Expected Output
empno | DaysSpendinSite2 |
---|---|
1 | 4026 |
2 | 2975 |
Script
Use below script to create table and insert sample data into it.
-- /****** Object: Table [dbo].[tblEmployee] Script Date: 10/1/2017 8:56:44 AM ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO SET ANSI_PADDING ON GO CREATE TABLE [dbo].[tblEmployee]( [empNo] [int] NULL, [empName] [varchar](7) NULL, [empHireDate] [datetime] NULL, [empHireSite] [int] NULL, [billet] [int] NULL, [retireDate] [datetime] NULL ) ON [PRIMARY] GO SET ANSI_PADDING OFF GO /****** Object: Table [dbo].[tblTransfere] Script Date: 10/1/2017 8:56:44 AM ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[tblTransfere]( [empNo] [int] NULL, [trfFromSite] [int] NULL, [trfToSite] [int] NULL, [trfDate] [datetime] NULL, [trfBillet] [int] NULL ) ON [PRIMARY] GO INSERT [dbo].[tblEmployee] ([empNo], [empName], [empHireDate], [empHireSite], [billet], [retireDate]) VALUES (1, N'ABC', CAST(0x00008F3000000000 AS DateTime), 1, 1, CAST(0x0000A7D500000000 AS DateTime)) GO INSERT [dbo].[tblEmployee] ([empNo], [empName], [empHireDate], [empHireSite], [billet], [retireDate]) VALUES (2, N'EFG', CAST(0x00008CED00000000 AS DateTime), 2, 2, NULL) GO INSERT [dbo].[tblEmployee] ([empNo], [empName], [empHireDate], [empHireSite], [billet], [retireDate]) VALUES (3, N'XYZ', CAST(0x0000799800000000 AS DateTime), 1, 3, NULL) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (1, 1, 2, CAST(0x000090BA00000000 AS DateTime), 4) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (1, 2, 2, CAST(0x000092FD00000000 AS DateTime), 5) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (1, 2, 2, CAST(0x0000970800000000 AS DateTime), 6) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (1, 2, 3, CAST(0x00009DA000000000 AS DateTime), 7) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (1, 3, 2, CAST(0x0000A50100000000 AS DateTime), 8) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 2, 2, CAST(0x00008CED00000000 AS DateTime), 9) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 2, 2, CAST(0x00008EB900000000 AS DateTime), 10) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 2, 2, CAST(0x000092BD00000000 AS DateTime), 11) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 2, 3, CAST(0x0000931300000000 AS DateTime), 12) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 3, 3, CAST(0x000096C800000000 AS DateTime), 13) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 3, 1, CAST(0x000098E600000000 AS DateTime), 14) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 1, 1, CAST(0x00009B2500000000 AS DateTime), 15) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 1, 1, CAST(0x00009FC500000000 AS DateTime), 16) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 1, 2, CAST(0x0000A13E00000000 AS DateTime), 17) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 2, 2, CAST(0x0000A47200000000 AS DateTime), 18) GO INSERT [dbo].[tblTransfere] ([empNo], [trfFromSite], [trfToSite], [trfDate], [trfBillet]) VALUES (2, 2, 1, CAST(0x0000A6B700000000 AS DateTime), 19) GO -- |
Rules/Restrictions
The solution should be should use “SELECT” statement or “CTE”.
Add your solution(s) in the comments section or send you solution(s) to pawankkmr@gmail.com
Solution – 1
-- select empno, SUM(Diffs) [DaysSpendinSite2] FROM ( SELECT *,DATEDIFF(day,trfDate,nxt) Diffs FROM ( SELECT u.* , CASE WHEN LEAD(trfDate) OVER (PARTITION BY e.empNo ORDER BY trfDate) IS NULL AND retireDate IS NOT NULL THEN retireDate WHEN LEAD(trfDate) OVER (PARTITION BY e.empNo ORDER BY trfDate) IS NULL AND retireDate IS NULL THEN GETDATE() ELSE LEAD(trfDate) OVER (PARTITION BY e.empNo ORDER BY trfDate) END nxt FROM ( select empno , empHireSite trfFromSite , empHireSite trfToSite , empHireDate trfDate , billet trfBillet from tblEmployee UNION ALL select empNo ,trfFromSite, trfToSite, trfDate ,trfBillet from tblTransfere )u INNER JOIN tblEmployee e ON u.empno = e.empno )i )p WHERE trfToSite = 2 GROUP BY empno -- |
Output
/*------------------------ Output ------------------------*/ empno DaysSpendinSite2 ----------- ---------------- 1 4026 2 2975 (2 row(s) affected)
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
Pawan Khowal
Http://MSBISkills.com