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                **1.MySQL中where與having的區別?** * having是在分組后對數據進行過濾. where是在分組前對數據進行過濾 * having后面可以使用分組函數(統計函數) where后面不可以使用分組函數。 where在group by之前執行,having 在group by 之后執行。 where和having 可以同時存在一個SQL語句中。 **2.java中==和equals的區別**
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