I want to join two tables in sql.

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SQL-Server-2008R2

i want to join two tables in sql.first table name is Shift. Second Table name is Leave. An employee may full present or half day absent or leave, or full day leave. If full day leave no data on shift table. If he give leave letter then record added on leave table. i want to join these two tables.

my tables look like
Shift

Empnum punchdate  shift 
Test1  01/09/2020   1
Test1  03/09/2020   0.5

Leave

Empnum LeaveDate  leaveFN  LeaveAF
Test1  02/09/2020  0.5       0.5
Test1  03/09/2020  0         0.5

i want to join like this

Test1 01/09/2020 1    0    0
Test1 02/09/2020 0    0.5  0.5
Test1 03/09/2020 0.5  0    0.5

What I have tried:

i tried left join, full outer join, cross etc
that shows,

Test1 01/09/2020 1 0.5  0.5
Test1 02/09/2020 1 0.5  0.5
Test1 01/09/2020 1 0    0.5
Test1 02/09/2020 1 0    0.5

Posted 28-Sep-20 21:53pm

BOOPATHI A

Updated 28-Sep-20 23:01pm

Maciej Los

v3

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Maciej Los · Answer 1 · 2020-09-28T23:01:00

You didn't show us what query you did use. Nevertheless...

To get desired result, you have to get all distinct dates and EmpNum's from both tables. See:

SQL

SET DATEFORMAT dmy;

CREATE TABLE Shift
(
  Empnum varchar(50),
  punchdate date,
  shift decimal(5,1)
);

CREATE TABLE Leave
(
  Empnum varchar(50),
  LeaveDate date,
  leaveFN decimal(5,1),
  LeaveAF decimal(5,1)
);

INSERT INTO Shift (Empnum, punchdate, shift)
VALUES('Test1', '01/09/2020', 1),
('Test1', '03/09/2020', 0.5),
('Test2', '01/09/2020', 1),
('Test2', '02/09/2020', 1)

INSERT INTO Leave(Empnum, LeaveDate, leaveFN, LeaveAF)
VALUES('Test1' , '02/09/2020', 0.5, 0.5),
('Test1', '03/09/2020', 0, 0.5)

;WITH CTE AS
(
    SELECT punchdate AS CurrentDate
    FROM Shift
    UNION ALL
    SELECT LeaveDate As CurrentDate
    FROM Leave
), Emps AS
(
    SELECT EmpNum 
    FROM Shift
    UNION ALL
    SELECT EmpNum
    FROM Leave
)
SELECT c.Empnum, c.CurrentDate, 
  COALESCE(s.shift, 0) shift,
  COALESCE(l.leaveFN, 0) leaveFN,  
  COALESCE(l.leaveAF, 0) leaveAF 
FROM
(
  SELECT DISTINCT cc.CurrentDate, ee.EmpNum
  FROM CTE cc CROSS JOIN Emps ee
) c LEFT JOIN Shift s ON c.CurrentDate = s.punchdate AND c.EmpNum = s.EmpNum
  LEFT JOIN Leave l ON c.CurrentDate = l.LeaveDate AND c.EmpNum = l.EmpNum

Result:

Empnum 	CurrentDate 	shift 	leaveFN 	leaveAF
Test1 	2020-09-01 	1.0 	0.0 	0.0
Test2 	2020-09-01 	1.0 	0.0 	0.0
Test1 	2020-09-02 	0.0 	0.5 	0.5
Test2 	2020-09-02 	1.0 	0.0 	0.0
Test1 	2020-09-03 	0.5 	0.0 	0.5
Test2 	2020-09-03 	0.0 	0.0 	0.0 <- missing record for Test2, which means no corresponding data in Shift and Leave table for 03/09/2020

db<>fiddle[^]

Good luck!