Add Records that Meet the Criteria before Each Group after Grouping — From SQL to SPL #39
Problem Description & Analysis: In a certain view of the PostgreSQL database, the row_index field is an underscore separated string and also a grouping field. Some groups’ row_index can be divided into 3 parts, while others can be divided into 2 part...
#sql#sqltutorial#databases#data-structures#database#productivity#coding#esproc-spl#opensource#data-analysis#data-analytics
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