Question: What if store types are far more than 3, e.g. 30?
The union way can only be used when there are limited stores that can be listed one by one. Then comes a question: if there are too many different \'stores\' to
The union way can only be used when there are limited stores that can be listed one by one. Then comes a question: if there are too many different \'stores\' to be listed, how could we deal with this problem?\nThanks a lot!
['MySQL']