I have two tables. One table has floor number(tb_FloorNumber.FloorNumber. records :For example 1 to 15) and another table which has Floor number and User_Id column(tb_Emp_Master.FloorNumber, tb_Emp_Master.User_Id). I want to bring all the records from tb_FloorNumber and only the records from tb_Emp_Master with the condition (User_Id = "fat35108").
I know I can do this with two queries like this : Query 1:
SELECT DISTINCT tb_Emp_Master.FloorNumber
FROM tb_Emp_Master
WHERE (((tb_Emp_Master.User_Id)="fat35108"));
Query2:
SELECT DISTINCT tb_FloorNumber.FloorNumber, Query1.FloorNumber
FROM tb_FloorNumber LEFT JOIN Query1 ON tb_FloorNumber.FloorNumber = Query1.FloorNumber;
But I want to write this query with sing query instead of using Query1 inside the Query 2
I have tried like this:
SELECT DISTINCT tb_FloorNumber.FloorNumber, tb_Emp_Master.FloorNumber
FROM tb_FloorNumber LEFT JOIN tb_Emp_Master ON tb_FloorNumber.FloorNumber = tb_Emp_Master.FloorNumber
WHERE (((tb_Emp_Master.User_Id)="fat35108"));
But it brings only one record (For instance 8)
Please help me how to write this
If you set the condition:
tb_Emp_Master.User_Id = "fat35108"
in the WHERE
clause, then you actually get an INNER JOIN
instead of a LEFT JOIN
because you filter only the matched rows from tb_Emp_Master
.
Use tb_Emp_Master
in the LEFT JOIN
instead of Query1
and set the condition in the ON
clause:
SELECT DISTINCT
tb_FloorNumber.FloorNumber,
tb_Emp_Master.FloorNumber
FROM tb_FloorNumber LEFT JOIN tb_Emp_Master
ON tb_FloorNumber.FloorNumber = tb_Emp_Master.FloorNumber AND tb_Emp_Master.User_Id = "fat35108";
I don't know why you need DISTINCT
so I use it too.
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