Subjunctive Tense Following "Que"

I've noticed there are some phrases that start with "que" that are followed by the subjunctive, even though there isn't any uncertainty or wishes or desires etc. For example, "Que tenga un buen día" or "Que sueñes con los angelitos". So basically my question is, are these specific examples, or is the subjunctive always used following "que" statements? Thank you!

submitted by /u/Aijol10
[link] [comments]