摘要： Table A have three columns, for each ID group, there are one or two or three codes (three is max), and for each code, there is a specific value associated with it, please write a sql to get the data in table B, where Code1 is the Code whose values is the smallest, value1 is the value of code1,the va 阅读全文

摘要： 今天遇到一个题目：You are a database developer on an instance of SQL Server. You have a table named Category. The Category table contains a hierarchy of living things to the sub-species level. Each row in the Category table has a ParentCatlD value that corresponds to the item’s parent classification in the h 阅读全文