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Improve groupBy doc.

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This commit is contained in:
Felipe Lessa 2015-05-12 12:51:47 -03:00
parent b20fe09755
commit 88d0202000
1 changed files with 4 additions and 3 deletions
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7
src/Database/Esqueleto/Internal/Language.hs
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@ -146,9 +146,10 @@ class (Functor query, Applicative query, Monad query) =>
-- return (bar ^. BarId, bar ^. BarName, countRows)
-- @
--
-- With groupBy you can sort by aggregate functions, like so (we
-- used @let@ to restrict the more general `countRows` to
-- @SqlExpr (Value Int)@ to avoid ambiguity):
-- With groupBy you can sort by aggregate functions, like so
-- (we used @let@ to restrict the more general 'countRows' to
-- @SqlExpr (Value Int)@ to avoid ambiguity---the second use of
-- 'countRows' has its type restricted by the @:: Int@ below):
--
-- @
-- r \<- select $ from \\(foo `'InnerJoin`` bar) -> do