I have a table as follows
我有一张如下表。
|Cutomers|Orders|Items| |Cutomer1|Order1|Item1| |Cutomer1|Order1|Item2| |Cutomer1|Order1|Item3| |Cutomer1|Order2|Item1| |Cutomer1|Order2|Item3| |Cutomer1|Order2|Item4| |Cutomer2|Order1|Item6| | . | . | . | | . | . | . | | . | . | . ||Cutomer
