Conversely, fewer rows than before might match when moving from a case-insensitive Collation to either a binary or case-sensitive Collation.This could result in a Cartesian product. More rows might match when moving from a binary or case-sensitive Collation to a case-insensitive Collation.But, if that Instance changes to either a binary or case-sensitive Collation, then that code will break due to the difference between and JOINs and WHERE predicates can change behavior based on columns having a new Collation: This will work just fine on an Instance having a case-insensitive Collation. For example, consider the following code: Since the Instance default Collation is changing, this impacts resolution of names of variables / parameters, cursors, and GOTO labels.But if the Database's Collation changes to be binary or case-sensitive, then that same value would evaluate to “ False”. Passing in yes for would evaluate to “ True” in a case-insensitive Database. Since the Database default Collations are changing, IF / WHILE / etc conditions for variable and input parameters can change behavior.Latin1_General_CI_AS to Latin1_General_100_CI_AS) can easily change sort orders as well as what equates to what: Simplistically, changing any Collation, even to the same Collation of a newer version (e.g.It assumes that the Collation will be changing across all levels (Instance, Database, and column) since one of the two methods for changing the Instance-level Collation will change all levels. The following should be a mostly-complete list of affected areas. But first, before seeing how to change an Instance’s Collation, it is important to understand exactly what the total impact of that change could be. There are two ways to accomplish this: one “official” and the other “unofficial”. People sometimes try to “fix” this problem by adding the COLLATE DATABASE_DEFAULT to string columns of temporary tables, and/or COLLATE keyword is inadequate or undesirable, there is the option of changing the Instance-level Collation. This can often lead to unexpected errors and/or sorting and comparison behavior. For various reasons, people sometimes find themselves in the unfortunate (and unenviable) situation of having a SQL Server Instance and/or Database configured with the wrong Collation.
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