Extracting Data Based On Two Fields

I have a table having multiple fields but I need to extract data based on the two fields.

Field1 Field2
1 | 123
1 | 213
2 | 123
2 | 3654
2 | 4758

I want the result with 2 cases

1.) distinct in Field 1 but multiple in field 2

Expected result:

Field1 column1 column2 column3
1 | 123 | 213
2 | 123 | 3654 | 4758

2.) multiple in field 1 but distinct in field 2

Expected Result :

Field 2 | Column1 | Column2
123 | 1 | 2

There may be more columns added according to the data available.