6e3af05 · squeal · git.iko.soy

git.iko.soy/squeal

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window docs

6e3af05Eitan Chatav8 years ago

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Window.hs+11−1

compare with dev

unifiedsplit

@@ -100,7 +100,9 @@ data WindowDefinition outer commons grp schemas params from where

100 WindowDefinition

101 :: SOP.SListI bys

102 => NP (Expression outer commons grp schemas params from) bys

103+ -- ^ partitions

103 -> [SortExpression outer commons grp schemas params from]

104 -> [SortExpression outer commons grp schemas params from]

105+ -- ^ ordering

104 -> WindowDefinition outer commons grp schemas params from

106 -> WindowDefinition outer commons grp schemas params from

105

107

106instance OrderBy WindowDefinition where

108instance OrderBy WindowDefinition where

@@ -127,7 +129,7 @@ the same partition as the current row.

127-}

129-}

128partitionBy

130partitionBy

129 :: SOP.SListI bys

131 :: SOP.SListI bys

130− => NP (Expression outer commons grp schemas params from) bys

132+ => NP (Expression outer commons grp schemas params from) bys -- ^ partitions

131 -> WindowDefinition outer commons grp schemas params from

133 -> WindowDefinition outer commons grp schemas params from

132partitionBy bys = WindowDefinition bys []

134partitionBy bys = WindowDefinition bys []

133

135

@@ -193,6 +195,7 @@ unsafeWindowFunctionN fun xs = UnsafeWindowFunction $ fun <>

193 parenthesized (renderCommaSeparated renderSQL xs)

195 parenthesized (renderCommaSeparated renderSQL xs)

194

196

195{- | rank of the current row with gaps; same as `rowNumber` of its first peer

197{- | rank of the current row with gaps; same as `rowNumber` of its first peer

198+

196>>> printSQL rank

199>>> printSQL rank

197rank()

200rank()

198-}

201-}

@@ -200,6 +203,7 @@ rank :: WinFun0 ('NotNull 'PGint8)

200rank = UnsafeWindowFunction "rank()"

203rank = UnsafeWindowFunction "rank()"

201

204

202{- | number of the current row within its partition, counting from 1

205{- | number of the current row within its partition, counting from 1

206+

203>>> printSQL rowNumber

207>>> printSQL rowNumber

204row_number()

208row_number()

205-}

209-}

@@ -207,6 +211,7 @@ rowNumber :: WinFun0 ('NotNull 'PGint8)

207rowNumber = UnsafeWindowFunction "row_number()"

211rowNumber = UnsafeWindowFunction "row_number()"

208

212

209{- | rank of the current row without gaps; this function counts peer groups

213{- | rank of the current row without gaps; this function counts peer groups

214+

210>>> printSQL denseRank

215>>> printSQL denseRank

211dense_rank()

216dense_rank()

212-}

217-}

@@ -214,6 +219,7 @@ denseRank :: WinFun0 ('NotNull 'PGint8)

214denseRank = UnsafeWindowFunction "dense_rank()"

219denseRank = UnsafeWindowFunction "dense_rank()"

215

220

216{- | relative rank of the current row: (rank - 1) / (total partition rows - 1)

221{- | relative rank of the current row: (rank - 1) / (total partition rows - 1)

222+

217>>> printSQL percentRank

223>>> printSQL percentRank

218percent_rank()

224percent_rank()

219-}

225-}

@@ -222,6 +228,7 @@ percentRank = UnsafeWindowFunction "percent_rank()"

222

228

223{- | cumulative distribution: (number of partition rows

229{- | cumulative distribution: (number of partition rows

224preceding or peer with current row) / total partition rows

230preceding or peer with current row) / total partition rows

231+

225>>> printSQL cumeDist

232>>> printSQL cumeDist

226cume_dist()

233cume_dist()

227-}

234-}

@@ -230,6 +237,9 @@ cumeDist = UnsafeWindowFunction "cume_dist()"

230

237

231{- | integer ranging from 1 to the argument value,

238{- | integer ranging from 1 to the argument value,

232dividing the partition as equally as possible

239dividing the partition as equally as possible

240+

241+>>> printSQL $ ntile 5

242+ntile(5)

233-}

243-}

234ntile :: WinFun1 ('NotNull 'PGint4) ('NotNull 'PGint4)

244ntile :: WinFun1 ('NotNull 'PGint4) ('NotNull 'PGint4)

235ntile = unsafeWindowFunction1 "ntile"

245ntile = unsafeWindowFunction1 "ntile"