Changes between Version 3 and Version 4 of BigTable

Timestamp:

May 5, 2008, 4:24:32 PM (16 years ago)

Author:

chwhs

Comment:

--

BigTable

@@ -3 +3 @@
 
  * The Bigtable data model is fairly straightforward, each data item is stored in a cell which can be accessed using its {row key, column key, timestamp}. 
-   *  注意: 由於無法實際操作過Bigtable,導致沒能確切知道Bigtable是否可以column key做搜尋(如:where ...), 不過Hypertable 與 Hbase經測試都僅能以row key做搜尋, 因此一開始應該是誤會Bigtable文章的意思, Bigtable和 Hypertable, Hbase 一樣, 可能都只能以row key 做查詢。
+   * 注意: 由於無法實際操作過Bigtable,導致沒能確切知道Bigtable是否可以column key做搜尋(如:where ...), 不過Hypertable 與 Hbase經測試都僅能以row key做搜尋, 因此一開始應該是誤會Bigtable文章的意思, Bigtable和 Hypertable, Hbase 一樣, 可能都只能以row key 做查詢。
+
+ * Bigtable 查詢資料所用的語言(GQL: Google Query Language)
+   * GQL is a SQL-like language for retrieving data entities from the App Engine scalable datastore. 
+   * While GQL's features are different from those of a query language for a traditional relational database, the GQL syntax is similar to that of SQL.
 
  * continue...(coming soon)