目录一、mysql数据库group_concat函数二、SQL Server实现group_concat函数实现sql：原理分析：三、oracle数据库实现1.vm_concat函数：2.listagg() within函数 ：总结一、mysql数据库group_concat函数
Today I was reading through some Hibernate code and I encounter something interesting. There is a class called CollectionHelper that defines the following constant varibale:
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