SQL Vs SPL: Simplifying Complex Grouping With Sequence Numbers
SQL solution fails due to cumbersome window functions & lack of natural sequence numbers. SPL retains grouped subsets, provides natural seq nums & direct referencing, making complex multi-step calculations easier.
The id and nbr of the MS SQL database table are grouping fields. After sorting the records within the group by time field dt, the order of 0 and 1 in the status field 'status' is different. Now we need to generate three calculated columns according to certain rules based on the records within the group, and fill them into the first record of each group, while filling in 0 for all other records. Calculated column Cont1Sta1: When there is at least one record in this group with status=1, assign a value of 1, otherwise fill in 0. Calculated column DateLagInDays: When there is at least one record...