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Take according to the actual situation, classify and summarize once every three levels, and see the figure to know the demand

2022-04-23 16:26:00 【Huang ha ha~】

This is the requirements , Here you need to use the hidden function , Still need to be in SQL Write another field in , Take the first four digits in the code SUBSTRING (NVL( Field ,‘ nothing ’),1,4) Insert picture description here
Take out the fourth column

In the report , You need to put it like this

to B7 Insert data column

When it's done , Need to be right A Column hide , In this column, we don't need to see

After hiding , Our needs are complete .