Hi hao do , the discrepancy here is within the first picture on line 2:
WHEN school_name < 'n' then 'a-m'
When you write <'n', you are also taking in all the null values that you see in the second picture (2508).
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Francisco Mosqueda the first pic is Mode tutorial's answer with query name from letter 'A' but return 'null' value. Error right?
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