How to count values from one table and update another table on same server in SQL Server?

Question

I have two tables in the same server

1. Attendance table
2. Payroll table

How to count present/absent from attendance table in (employee database) and update that count info payroll table in (payroll database) on the same server?

Please help me to solve this problem.

Attendance table:

Payroll table:

Answer 1

Try this

;WITH X
AS(
    SELECT
         EmpId
        ,COUNT(EntryType) 'P_Count'
    FROM
        dbo.Attendance
    WHERE
        EntryType = 'P'
    GROUP BY
        EmpId
)
UPDATE
    P
SET
    P.Presents  = X.P_Count
FROM
    dbo.PayRoll P
INNER JOIN
    X       A   ON A.EmpId = P.EmpId