Is EXISTS(SELECT 1 ...) better than EXISTS(SELECT * ...)? Who would know better than SQL Server?
Impact on Indexes When Mixing VARCHAR and NVARCHAR Types
(last updated: 2019-11-10 @ 11:15 EST / 2019-11-10 @ 16:15 UTC ) You may have heard, or read, that you should not mix VARCHAR and NVARCHAR datatypes, especially when one of them is a JOIN or WHERE predicate / condition, as doing so will invalidate indexes. While it is always best to have all datatypes… Continue reading Impact on Indexes When Mixing VARCHAR and NVARCHAR Types