How does `yum` prioritize repositories while installing packages? - Red Hat Customer Portal

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Issue

There are two packages with exact the same name and same version in two enabled repositories.
For example enabled repository #1 has a name alpha_repo and enabled repositor #2 has a name beta_repo, both of these repositories have this package php-mysql-5.4.6-1.x86_64.rpm.
When user will do yum install php-mysql from which repository yum will choose the package?
Is it correct to state that yum in this case will choose the repository in natural order?
Meaning will select by alphabetically sorting order, hence from alpha_repo?

Environment

Red Hat Enterprise Linux 5/6
Yum

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