When Using a Multiple-column Primary Key (PK) With Always True Condition, MySQL Returns Only the First Row
Last updated on MAY 29, 2017
Applies to:MySQL Server - Version 5.5 to 5.5 [Release 5.5]
Information in this document applies to any platform.
When using a multiple-column primary key and an always true condition (y<=3 OR y>3), MySQL only returns the first row match.
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