lol_rails.sql

-- Before

SELECT  "namespaces".*
FROM "namespaces"
WHERE "namespaces"."type" IN ('Group')
AND "namespaces"."id" = 2
AND "namespaces"."type" IN ('Group')
AND "namespaces"."type" = 'Group'
ORDER BY "namespaces"."id" DESC
LIMIT 1;

-- This is really all we need to achieve the exact same result:

SELECT namespaces.*
FROM namespaces
WHERE namespaces.id = 2

-- This is because "id" is a unique value, so if you know what ID you
-- are looking for you will never get a row that you didn't expect,
-- meaning the "type" WHEREs are completely pointless.