Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.
Select UserName, sum(total1) + sum(total2) as Total from ( SELECT UserName,COUNT(UserName) as total1, 0 as total2 from TableJane Group by UserName UNION ALL SELECT UserName,0 as total1, COUNT(UserName) as total2 from TableJohn Group by UserName ) as table1 group by UserName Order By UserName
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