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The page "GaganSaksena" has been deleted by JoanTouzet: https://wiki.apache.org/couchdb/GaganSaksena?action=diff&rev1=7&rev2=8 Comment: We already have a "Cookbook for SQL jockeys" - #format wiki - #language en - == Gagan Saksena == - Some recipes/notes from using CouchDB. These could be valuable someday for others navigating their way in these waters. For now mostly a placeholder for things I'm learning. This is '''work in progress'''! - ==== Handy shortcuts ==== - There are a number of handy shortcuts for doing standard reduce tasks- Checkout [[Built-In_Reduce_Functions]] for more details. - - === SQL Recipes in Map/Reduce === - A collection of handy recipes to do common tasks in map/reduce. This page is still in development- checkout this book's page for some useful details- [[http://books.couchdb.org/relax/reference/views-for-sql-jockeys|Views for SQL jockeys]] - - For the purpose of these recipes- the equivalent SQL table looks like this- - - {{{ - CREATE TABLE Foo ( - Name CHAR(256), - Age INTEGER, - StartDate DATE - ); - }}} - ||<tablewidth="80%">'''SQL''' ||'''Map''' ||'''Reduce''' ||'''Notes''' || - ||SELECT COUNT(*) FROM Foo; ||function (doc) { emit(doc._id, 1); } ||_count || || - ||SELECT COUNT(*) FROM Foo WHERE Foo.Age ="21"; ||function (doc) { emit(doc.age, null); } ||_count ||Fetch view with ?key=21 || - ||SELECT DISTINCT Age FROM Foo; ||function (doc) { emit(doc.age, true); } || function (key, value, rereduce) { // todo } || || - ||GROUP BY example ||function (doc) { // todo } || || || - ||GROUP BY with SORT BY example ||function (doc) { // todo } || || || - - - ---- - CategoryHomepage -
