I am using LLBLGEN where there is a method to execute a query as a scalar query. Googling gives me a definition for scalar sub-query, are they the same ?
A scalar query is a query that returns one row consisting of one column.
For what it's worth:
Scalar subqueries or scalar queries are queries that return exactly one column and one or zero records.
Aslam Khan
A scalar method is used for aggregate functions such as max, min, sum, avg and so on. Whenever you want to return a single value after execute the query.
来源：https://stackoverflow.com/questions/20424966/what-is-a-scalar-query