问题
In the interest of time, I do mean GQL, as in
SELECT * FROM Song WHERE composer = 'Lennon, John'
The following failed
SELECT COUNT(*) FROM myEntity
also the following
SELECT COUNT() FROM myEntity
回答1:
As shown here, there is actually a way to count the return of your GQL. The doc about the GQL language shows you can't really do a count on the query itself. So what you would do is take your select *, put it in a GQL query object, then call the "count()" method on that object to have the count
来源：https://stackoverflow.com/questions/27177513/what-is-the-gql-count-query