Joining 4 Tables in SQL Server Using Join

Question

Hi Friends I have to join 4 tables in SQL Server and need to Show Specific Coulmns in Data Grid View

First Table : emp_details

Answer 1

Below is the query you need, you should consider keeping your naming conventions consistent because this helps visually and reduce bugs when writing code.

SELECT ed.emp_id, ed.emp_name , ed.emp_pf, emd.designation_name, te.pfacc1, te.pfacc2, temp. pf_percent, temp.pf_max
FROM dbo.emp_details AS ed
LEFT JOIN dbo.emp_designation AS emd ON emd.designation_id = ed.emp_designation 
LEFT JOIN dbo.tbl_empcontribution AS te ON te.eid = ed.emp_id
LEFT JOIN dbo.tbl_empdeduction AS temp ON temp.eid = ed.emp_id

Answer 2

    SELECT e1.emp_id, e1.emp_name, e1.emp_pf, e2. designation_name, e3.pfacc1, e3.pfacc2, e4. pf_percent,  e4.pf_max 

from emp_details e1, tbl_designation e2, tbl_empcontribution e3, tbl_empdeduction e4

 where e1.emp_id= e2.emp_id and e2.emp_id=e3.emp_id and e3.emp_id= e4.emp_id;

assuming you have emp_id as foreign key in all 4 tables