My coding style for SQL

coding-style.sql

/*  Idea:
    * Use 8 spaces for indenting the body of clauses
    * Use 4 spaces for all other indentation
    * Set your editor to expand tab to 4 spaces

    This is highly readible while minimising effort while writing.
    Indentation that requires manual character-level alignment would be
    extremely painful (for me).
*/
with

rawtbl as (
    select  distinct
            a.foo,
            b.bar,
            case
                when c.baz is null then
                    0
                when c.baz < 100 then
                    c.baz
                else
                    100
            end as bazclamp
    from    a
            inner join b
                on  a.idx = b.idx
            left join c
                on  a.t1 = c.t1 and
                    a.t2 = c.t2
    where   a.is_deleted 0 = and
            exists (
                select  1
                from    d
                where   d.a_idx = a.idx
            ) and 
            (
                a.important = 1
            or
                a.possible = 1 and
                b.required = 1
            )
),

select  foo,
        bar,
        sum(bazclamp) as baztotal
from    rawtbl
group   by foo, bar
having  min(bazclamp) > 0
order   by 3 desc, 1, 2

/*
    It's unfortunate that "by" is compulsory with GROUP BY and ORDER BY,
    making them not fit in 7 characters.
    If I am grouping or ordering by many columns, I put "by" on its own line.
*/

select  *
from    widetable
order   by
        idx,
        apples,
        pears desc,
        oranges