Add SQLAgent folder

SQLAgent/01_Devl/3_Job_Maintenance/DetachDeleteScheduleByName.sql

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+-- If you know both the job name and schedule name
+DECLARE @JobName NVARCHAR(100) = 'DEVL_MONTHLY_DTSCHGDC';
+DECLARE @ScheduleName NVARCHAR(200) = 'DEVL_MONTHLY_DTSCHGDC_MonthlySchedule';
+DECLARE @JobId UNIQUEIDENTIFIER;
+
+-- Get job ID
+SELECT @JobId = job_id FROM msdb.dbo.sysjobs WHERE name = @JobName;
+
+-- Detach from specific job
+EXEC msdb.dbo.sp_detach_schedule @job_id = @JobId, @schedule_name = @ScheduleName;
+
+-- Then delete
+EXEC msdb.dbo.sp_delete_schedule @schedule_name = @ScheduleName;