[Solved] Slow WHERE EXISTS in SQL Server

How to optimize this SQL query?

In case you have your own slow SQL query, you can optimize it automatically here.

For the query above, the following recommendations will be helpful as part of the SQL tuning process.
You'll find 3 sections below:

  1. Description of the steps you can take to speed up the query.
  2. The optimal indexes for this query, which you can copy and create in your database.
  3. An automatically re-written query you can copy and execute in your database.
The optimization process and recommendations:
  1. Create Optimal Indexes (modified query below): The recommended indexes are an integral part of this optimization effort and should be created before testing the execution duration of the optimized query.
Optimal indexes for this query:
CREATE INDEX tfemptemp_idx_employeecode_tfsourceid ON dbo.TFEmpTemp (EmployeeCode,TFSourceID);
CREATE INDEX tftimesheettemp_idx_startt_endtim_activi_paymen_branch ON dbo.TFTimesheetTemp (StartTime,EndTime,ActivityCode,PaymentCode,BranchCode);
The optimized query:
        EXISTS (
                dwload.dbo.TFTimesheetTemp t 
            INNER JOIN
                dwload.dbo.TFEmpTemp e 
                    ON t.EmployeeCode = e.EmployeeCode 
                dwload.dbo.TF_Full_Backup_AT.TFSourceID = e.TFSourceID 
                AND dwload.dbo.TF_Full_Backup_AT.StartTime = t.StartTime 
                AND dwload.dbo.TF_Full_Backup_AT.EndTime = t.EndTime 
                AND dwload.dbo.TF_Full_Backup_AT.ActivityCode = t.ActivityCode 
                AND dwload.dbo.TF_Full_Backup_AT.PaymentCode = t.PaymentCode 
                AND dwload.dbo.TF_Full_Backup_AT.BranchCode = t.BranchCode

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