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To your first question, you can't really do any query through YQL to get data for all companies. It's more oriented towards obtaining data for a smaller query. (I.e., it's not going to give you a full data dump of the whole Yahoo! Finance database.)
At Yahoo Finance, you get free stock quotes, up-to-date news, portfolio management resources, international market data, social interaction and mortgage rates that help you manage your...
11 sty 2021 · The Yahoo Finance API is a range of libraries/APIs/methods to obtain historical and real time data for a variety of financial markets and products.
17 mar 2011 · YQL eliminates this problem by providing a single endpoint to query and shape the data you request. In this tutorial, we'll be using the YQL open data tables provided by Yahoo Finance in order to retrieve and present stock quote information.
The guys at yahoo have created this wonderful Yahoo Query Language (YQL). YQL treats individual web services as though they were data tables, allowing developers to formulate SQL-like queries to extract information from them.
29 gru 2015 · In order to get the average daily volume for Yahoo you could use the following YQL: select symbol,AverageDailyVolume from yahoo.finance.quote where symbol in ("YHOO") Share
It'd be simpler to first collect all the symbol names, and then query Yahoo once for all of them, instead of firing off queries one at a time. Use $.getJSON 's ability to accept a data object, rather than manually creating a query string
