SQL Statement indentation good practice [closed]

Answer 1

Here's my poke at this:

select column1, column2
    from table1
    where (column3 in (
        select top(1) column4
            from table2
            inner join table3
                on (table2.column1 = table3.column1)
    ))
;

• Everything lowercase because it's easier to read lowercase characters (and we have code highlighting to emphasize keywords) also easier to type
• Every restriction or option on a keyword (like the from on the select or the on on the join) is indented to show their dependance on the outward keyword
• The closing bracket is at the same indenting level as the opening where
• Use brackets for where- and on-clauses to increase readability
• Have the semicolon closing the select-statement at the same indenting so multiple statements can be distinguished better (if you need a semicolon in your language like SAS PROC SQL does)
• It's still quite compact and does not stretch all over the page