【 Abstract 】
Aggregation is the calculation of data , Returns the aggregate result . Aggregation operations are often accompanied by grouping operations , In addition to the usual summation 、 Maximum 、 minimum value 、 Aggregation operations such as counting , And some logic operations and so on . How to deal with the polymerization problem easily and quickly , Here's the whole process , And provide esProc Sample code . Examples of unconventional aggregation problems
1. Aggregate sum after enumeration grouping
【 example 1】 From the city GDP In the table , Separate statistics of municipalities directly under the central government 、 Per capita in first tier and second tier cities GDP. City GDP Some of the data in the table are as follows ：
【SPL Script 】
A5 The results are as follows ：
2. Merge overlapping time intervals
【 example 2】 Take the customer ANATR Merge order records with recurring time periods . Some data in the customer table are as follows ：
【SPL Script 】
A4 The results are as follows ：
3. Count the number of satisfied conditions in group aggregation
【 example 4】 Ask for the number of students who failed in each subject in a class . Some of the data in the report form are as follows ：
【SPL Script 】
A3 The results are as follows ：
4. In a set of Boolean values , Aggregation performs logic and operations
【 example 5】 According to a series of primary school online teaching terminal Questionnaire , See if all students have access to mobile phones . The questionnaire and summary contents of each class are as follows ：
【SPL Script 】
A4 The results are as follows ：
5. In a set of Boolean values , To perform logic or operations in aggregation
【 example 6】 Check with customers RATTC, stay 2014 Whether it has been ranked in the top three of monthly sales . The data in the sales table are as follows ：
【SPL Script 】
A7 The results are as follows ：
《SPL CookBook》 There are more examples of relevant calculations in .
