对于单个表，如何折叠具有互斥列数据的多行

Question

I wish to combine rows of a table, with mutually exclusive column values, retaining all columns: For example:

Name Data1 Data2 Data3 .... DataN
NAM1  6     NULL  NULL ...   NULL
NAM1  NULL  NULL  7    ...   NULL
NAM2  NULL   8    NULL ...   NULL
NAM3  5     NULL  NULL ...   NULL
NAM3  NULL  NULL   9   ...   NULL
NAM3  NULL   4    NULL ...   NULL
NAM4  etc

The characteristic of the data on each row of the table only 1 of the values Data1 ... DataN will not be NULL

I want the results to be

NAME DATA1 DATA2 DATA3 ... DATAN
NAM1  6     NULL  7    ...  NULL
NAM2  NULL  8     NULL ...  NULL
NAM3  5     4     9    ...  NULL
NAM4

Answer 1

select Name, MAX(Data1), MAX(Data2), MAX(Data3) from test
group by Name