SQL Learning to repeat the query

The following is a table of data

Executes the select content from dbo. Logo, return the following results

But this time we only need one of the same content, but the query came out obviously a lot of repetition,

So we just need to add the DISTINCT keyword in front of the field that needs to be queried, so execute the following code

Select DISTINCT content from dbo. Logo

All the duplicate records were removed.

We need to be careful when using the DISTINCT keyword:

Distinct cannot be partially used, because distinct acts on all columns, not just the column behind him,

SQL Learning to repeat the query