classes more than 5 student
MySQl\n\nSELECT\n    class\nFROM\n    courses\nGROUP BY class\nHAVING COUNT(DISTINCT student)>= 5;\n
MySQl\n```\nSELECT\n    class\nFROM\n    courses\nGROUP BY class\nHAVING COUNT(DISTINCT student)>= 5;\n```
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