Contents
Which is the best description of the aggregation problem?
Aggregation problem. An aggregate in economics is a summary measure describing a market or economy. The aggregation problem is the difficult problem of finding a valid way to treat an empirical or theoretical aggregate as if it reacted like a less-aggregated measure, say, about behavior of an individual agent as described in general…
When to use string agg in SQL Server 2017?
If we are using an older version than SQL Server 2017, we can use FOR XML PATH and STUFF statements combinations in the query to concatenate rows expressions. However, this method is more complicated than STRING_AGG function but it can be useful for the older version of the SQL Server.
When to use group by clause in string agg?
The GROUP BY clause will be necessary if the STRING_AGG result is not a sole column in the result set of the query. In the next section, we will learn this concept. GROUP BY clause provides grouping the rows that have the same values in SQL Server.
When to ignore null values in string _ agg?
The NULL values are ignored when the STRING_AGG concatenates the expressions in the rows and it also does not add an extra separator between the expressions due to NULL values. The following example will be illustrated in this case: As we can see, the NULL value did not affect the result of the function.
What is the aggregation problem in microeconomic theory?
The aggregation problem is the difficult problem of finding a valid way to treat an empirical or theoretical aggregate as if it reacted like a less-aggregated measure, say, about behavior of an individual agent as described in general microeconomic theory.
The aggregate consumer demand curve is the summation of the individual consumer demand curves. The aggregation process preserves only two characteristics of individual consumer preference theory—continuity and homogeneity. Aggregation introduces three additional non-price determinants of demand: Number of consumers.
What are the characteristics of an aggregate demand curve?
Aggregate consumer demand curve The aggregate consumer demand curve is the summation of the individual consumer demand curves. The aggregation process preserves only two characteristics of individual consumer preference theory —continuity and homogeneity. Aggregation introduces three additional non-price determinants of demand: