Hello,

> In your schema, SaleItem_SaleUUID collates using NOCASE and Picture_UUID
> collates using BINARY.
I think you mean SaleItem_PictureUUID, not SaleItem_SaleUUID, but yes.

> Note that I was mistaken earlier when I said that "X=Y" and "Y=X" should
> result in the same answer.  If X and Y have different default collating
> sequences, then X=Y does not mean the same thing as Y=X and so the answers
> can be different.
Right, I understand. Perhaps a brief note on the docs for the query optimizer 
to remind people of this might be worth it - it seems slightly 
counterintuitive, from a 'normal' user's point of view. 

Many thanks for the help - much appreciated. 

Best wishes,

Hamish
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