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One SQL question tests your database usage capabilities

Source: Internet
Author: User
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Question: The following data exists in the database to calculate the user's final balance.

User Type Amount
A Save 100
A Save 200
A Retrieve 100
A Retrieve 200
A Save 300
A Retrieve 300

I am more familiar with Oracle, so I will give an Oracle solution:

Sum (Decode!

If you have a better method, please leave a message!


The best implementation method for MySQL is the same as that for MySQL database!


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